| Ferrite-Ferroelectric Heteroepitaxial Structures and Frequency Agile Multiferroic RF Components |
27 Nov 2012 |
13 pages |
| Authors:
Gopalan Srinivasan; OAKLAND UNIV ROCHESTER MI DEPT OF PHYSICS
|
 | Results of our ONR supported activities on miniature, rapid-response, frequency agile multiferroic RF components are discussed here. Ferrite-ferroelectric bilayers were synthesized by techniques including electrophoretic deposition, eutectic bonding and MOCVD and were characterized in terms of strain mediated magneto-electric coupling by ferromagnetic resonance. Devices studied include 1-3GHz ferrite-ferroelectric band-pass filter, 18-36 GHz magneto-dielectric band-pass filter, 12-24 GHz hexaferrite-ferroelectric phase shifter and beam-forming antennas. |
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| Design, Fabrication, and Evaluation of a MEMS-Based, Ka-Band, 16-Element Sub-Array |
Nov-2009 |
47 pages |
| Authors:
Janice C Rock; Tracy D Hudson; Brandon Wolfson; Daniel Lawrence; Brandon Pillans; Andrew R Brown; Louis A Coryell; Richard A Milburn; ARMY AVIATION AND MISSILE RESEARCH DEVELOPMENT ENG CTR REDSTONE ARSENAL AL WEAPONS DEVELOPMENT AND INTEGRATION DIRECTORATE
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| The Aviation and Missile Research, Development and Engineering Center (AMRDEC) has recently completed an Army Technology Objective (ATO) aimed at furthering phased arrays for both tactical seekers and communication links. The ATO has been pursuing both MicroElectroMechanical Systems (MEMS) and Monolithic Microwave Integrated Circuit (MMIC)-based phase shifters with an overall goal of reducing missile seeker costs by 50 percent based on the missile mission. In a collaborative effort with the ... |
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| Manufacturable Tri-Stack AlSb/InAs HEMT Low-Noise Amplifiers Using Wafer-Level-Packaging Technology for Light-Weight and Ultralow-Power Applications |
May 2009 |
4 pages |
| Authors:
Y C Chou; P Chang-Chien; J M Yang; M Y Nishimoto; K Hennig; M D Lange; X Zeng; M R Parlee; C H Lin; L S Lee; NORTHROP GRUMMAN INC REDONDO BEACH CA
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| A wafer-level-packaging technology was used to integrate the 0.1 m AlSb/InAs HEMT low-noise amplifiers with power amplifiers, switches and phase shifters to form a compact tri-stack transmit/receive module for light-weight and ultralow-power applications. The high manufacturability of AlSb/InAs HEMT receivers operating at 0.9 mW was demonstrated on a tri-stack wafer. This demonstration of manufacturable tri-stack transmit/receive modules is essential for phased-array applications requiring light weight and ultralow power. |
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| Novel Devices Using Multifunctional ZnO and Its Nanostructures |
Dec-2008 |
9 pages |
| Authors:
Yicheng Lu; R H Wittstruck; D Mackie; H Shen; Pavel Reyes; Ziqing Duan; Hanhong Chen; Gaurav Saraf; Jun Zhu; Jian Zhong; A Ballato; RUTGERS - THE STATE UNIV PISCATAWAY NJ DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Zinc oxide (ZnO) is a promising wide band gap semiconductor. It has a direct energy band gap, Eg of 3.3eV at room temperature. ZnO can be alloyed with CdO and MgO to form the ternaries CdxZn1-xO and MgxZn1-xO, extending the direct energy band from 2.8eV to 4.0eV. Through proper doping, it also can be made transparent and conductive, piezoelectric, or ferromagnetic. ZnO based single crystal nanostructures can be grown at ... |
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| Piezomems Devices for Advanced Communications and Phased Array Radar |
Dec-2008 |
5 pages |
| Authors:
Daniel Judy; Ronald G Polcawich; Jeffrey S Pulskamp; ARMY RESEARCH LAB ADELPHI MD SCIENCES AND ELECTRON DEVICES DIRECTORATE
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| In this article, we report on the successful demonstration of lead zirconate titanate (PZT) thin film based MEMS devices for use in radio frequency (RF) systems. Individual series switches and single pole multi-throw switching elements operating at or below 10 V have been developed capable of operating over a wide temperature range. The switch technology also provides an enabling technology for low voltage, mechanical logic. Along with switches and phase ... |
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| Design and Characterization of Frequency Agile RF and Microwave Devices using Ferroelectrics |
Jan-2006 |
307 pages |
| Authors:
Jayesh Nath; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A methodology for the optimized design of tunable distributed resonators is introduced and verified. This technique enables maximum tuning with minimum degradation in quality (Q) factor. The concept of a network transformation factor and a new figure-of-merit for tunable resonators is introduced and applied to experimental data. The figure-of-merit quantifies the trade-off between tunability and Q factor for a given tuning ratio of the variable reactance device. As such, it ... |
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| Feasibility of T/R Module Functionality in a Single SiGe IC |
AUG 2005 |
25 pages |
| Authors:
John D. Cressler; Jonathan Comeau; Joel Andrews; Lance Kuo; Matt Morton; John Papapolymerou; Mark Mitchell; Tracy Wallace; Mike Harris; Bob Parks; GEORGIA INST OF TECH ATLANTA
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| Trade Space Analysis of Antenna Array Architecture Using System Modeling Tools |
DEC 2004 |
110 pages |
| Authors:
Eugene Johnson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| This trade study has two objectives. The first provides a trade space analysis of differing array architectures and associated radio frequency components using system-modeling tools. The second objective develops system modeling tools aiding similar analysis by other users. These objectives were accomplished by evaluating a selected group of output parameters to include overall system cost, mass, and power consumption, as well as the minimum detectable input level, system spurious free ... |
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| Digital Antenna Architectures Using Commercial Off the Shelf Hardware |
DEC 2003 |
96 pages |
| Authors:
Cher Shin Eng; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The changes in war fighting tactics and advancement of technology shape the ways to implement and design multifunction phased array radars. This thesis investigated whether the commercial modulation boards used in the 3-D 2, 4-GHz phased array transmit antenna is capable of wideband performance. The phase of the transmitted signal out of the modulator board was adjusted to provide a phase shift from 0 to 2pi, and the insertion phases ... |
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| Thin-Film Phase Shifters |
09 SEP 2003 |
6 pages |
| Authors:
Chris Elsass; AGILE MATERIALS AND TECHNOLOGIES INC GOLETA CA
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| This work has concentrated on developing thin-film tunable dielectric technology towards commercial viability for phase-shifters. Agile's varactor and phase shifter modeling has demonstrated the potential for this technology to provide low loss phase shifters utilizing Barium Strontium Titanate (BST) as the tunable dielectric material. Initial work involved fabrication of parallel plate capacitors as test structures which demonstrated the high quality of the BST films. Prototype phase-shifters utilizing such films were ... |
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| Multi-Beam Transmit Receive Module for Use and SGLS Band Satellite Links |
SEP 2003 |
14 pages |
| Authors:
Sarjit S. Bharj; Paul Oleski; Boris Tomasic; John Turtle; S. Liu; PRINCETON MICROWAVE TECHNOLOGY INC PRINCETON JUNCTION NJ
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| The development of a low cost Transmit-Receive module (T/R) for the next generation of Phase Array Antennas for the Air Force Satellite Control Network has been achieved. The T/R module consists of dual transmit channels each capable of 30 dBm output power, a 4-Bit phase control and a 4-Bit amplitude control. In addition, beam switching and on board digital control has been implemented. The dual receive channels exhibit a 2 ... |
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| Genetic Algorithm Design And Testing of a Random Element 3-D 2.4 Ghz Phased Array Transmit Antenna Constructed of Commercial Rf Microchips |
JUN 2003 |
135 pages |
| Authors:
Lance C. Esswein; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The United States Navy requires radical and innovative ways to nodal and design multifunction phased array radars. This thesis puts forth the concept that Genetic Algorithms, computer simulations that mirror the natural selection process to develop creative solutions to complex problems, would be extremely well suited in this application. The capability of a Genetic Algorithm to predict adequately the behavior of an array antenna with randomly located elements was verified ... |
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| Physics of Magnetic Multilayers and Devices at Millimeter Wave Frequencies |
MAY 2003 |
52 pages |
| Authors:
Zbigniew J. Celinski; Robert E. Camley; COLORADO UNIV AT COLORADO SPRINGS DEPT OF PHYSICS
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| Microwave devices are widely used in both military and civilian communications systems. During the last decades, we have witnessed incredible progress in high frequency semiconductor electronics and, in particular, a movement towards the synthesis of different electronic components into integrated circuits. The obvious obstacle, however, to an increased use of microwave and millimeter wave technology is the lack of advances in magnetic structures at high frequencies, 10-100 GHz. The main ... |
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| Reliability and Stability of Novel Tunable Thin Film |
03 APR 2003 |
8 pages |
| Authors:
G. H. Lin; R. Fu; S. He; J. Sun; X Zhang; PARATEK MICROWAVE INC COLUMBIA MD
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| A new process has been developed in Paratek Microwave Inc. to formulate stable tunable (Ba, Sr)TiO3 (BST) based thin film material. Varactors, with a co-planar structure, were fabricated by using the new material. The varactor Q of 105 tested at 2 GHz was observed with average tunability of 58 % at 150V (37.5 V/micrometer). The lifetime tests indicated that this material is very stable under continuous 100 to 150 V ... |
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| Off Axis Growth of Strontium Titanate Films with High Dielectric Constant Tuning and Low Loss |
03 APR 2003 |
6 pages |
| Authors:
Satreerat Kampangkeaw; Charles T. Rogers; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| We have measured the nonlinear dielectric properties of strontium titanate (STO) thin films grown on neodymium gallate (NGO) and lanthanum aluminate (LAO) substrates. The films prepared by off-axis pulsed laser deposition were characterized by their dielectric constant and loss tangent at 1 MHz and 2 GHz, and from room temperature down to 4 K. The resulting films show significant variations of dielectric properties with position of the substrates with respect ... |
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| Microwave Dielectric Spectroscopy of Ferroelectric Thin Films |
03 APR 2003 |
6 pages |
| Authors:
Beomjin Kim; Victor Kazmirenko; Minki Jeong; Yuri Poplavko; Sunggi Baik; POHANG UNIV OF SCIENCE AND TECHNOLOGY (REPUBLIC OF KOREA) DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| We devised a measurement method of microwave dielectric constants of dielectric thin films without applying electrodes. The method uses a rectangular waveguide in which the dielectric thin films prepared on a substrate are filled vertically at the center. The frequency dependence of S-parameter measured by network analyzer enables us to calculate the dielectric constant and loss factor of the films at the microwave region through simulation. We prepared Ba(0.6)Sr(0.4)TiO3 thin ... |
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| Comparison of Microwave Dielectric Properties of between (001) and (011) Ferroelectric Ba(1-x)Sr(x)TiO3 Thin Films Grown by Pulsed Laser Deposition |
03 APR 2003 |
6 pages |
| Authors:
Seung Eon Moon; Eun-Kyoung Kim; Su-Jae Lee; Seok-Kil Han; ELECTRONICS AND TELECOMMUNICATIONS RES INST TAEJON (REPUBLIC OF KOREA) WIRELESS COMM DEPT/BASIC RESEARCH LAB
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| The effects of anisotropic dielectric properties of ferroelectric Ba(1-x)Sr(x)TiO3 (BST) films on the characteristics of phase shifter have been studied in microwave regions at room temperature. Ferroelectric BST films with (001) and (011) orientation were epitaxially grown on (001) and (011) MgO substrates, respectively, by pulsed laser deposition method. The structures of BST films were investigated using x-ray diffraction measurement. The microwave properties of orientation engineered BST films were investigated ... |
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| A Statistical Analysis of Laser Ablated Ba(0.50)Sr(0.50)TiO3/LaAlO3 Films for Microwave Applications |
03 APR 2003 |
12 pages |
| Authors:
R. R. Romanofsky; N. C. Varaljay; S. A. Alterovitz; F. A. Miranda; C. M. Mueller; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
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| The NASA Glenn Research Center is constructing a 616 element scanning phased array antenna using thin film Ba(x)Sr(1-x)TiO3 based phase shifters. A critical milestone is the production of 616 identical phase shifters at 19 GHz with ^^4 dB insertion loss and at least 337.5 deg phase shift with 3 percent bandwidth. It is well known that there is a direct relationship between dielectric tuning and loss due to the Kramers-Kronig ... |
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| Application of Ferroelectrics in Low-Cost Microwave Phased-Array Antennas |
03 APR 2003 |
11 pages |
| Authors:
J. B. Rao; D. P. Patel; P. K. Park; T. K. Dougherty; J. A. Zelik; NAVAL RESEARCH LAB WASHINGTON DC RADARDIV
|
| A novel low-cost, phased-array antenna that uniquely incorporates bulk phase shifting using voltage-tunable dielectric (VTD) material is presented. The array does not contain an individual phase shifter at each radiating element. This paper presents the antenna concept and describes how it can be used as a low-cost phased array. The VTDs that are used in this antenna are described. The measured antenna patterns of a prototype phased array demonstrating electronic ... |
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| Final Report for Grant of Properties of Magnetic Multilayer and Microstructures |
26 JUL 2002 |
9 pages |
| Authors:
R. E. Camley; D. L. Mills; COLORADO UNIV AT COLORADO SPRINGS
|
| This report describes research done on the basic physics of magnetic multilayers and microstructures. Among the problems studied were 1) Exchange Bias and Coercive Fields in Ferromagnet/Antiferromagnet Structures we examined how these parameters depended on temperature and on surface roughness 2) Microwave Response of Microstructures Filters and Phase Shifters. Here we looked at exchange-spring systems, mictrostrip and coplanar notch filters and phase shifters using metallic ferromagnets. 3) Damping Mechanisms in ... |
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| Materials Research Society Symposium Proceedings; Volume 720. Materials Issues for Tunable RF and Microwave Devices III Held in San Francisco, California on April 2-3, 2002 |
03 APR 2002 |
|
| Authors:
Steven C. Tidrow; James S. Horwitz; Xiaoxing Xi; Jeremy Levy; MATERIALS RESEARCH SOCIETY WARRENDALE PA
|
 | The purpose of this symposium was to bring together researchers from a broad range of disciplines to discuss the challenges facing the implementation of an affordable tunable RF and microwave device technology. Low cost, tunable, microwave devices will have a tremendous impact on a variety of commercial and military systems, including, but not limited to, tunable band-select filters for wireless communications, phase shifters and true time delay devices for electronic ... |
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| Experiments with Mutually Coupled Arrays of Josephson Junctions |
28 SEP 2001 |
28 pages |
| Authors:
A. A. Abdumalikov; P. Caputo; Alexey V. Ustinov; ERLANGEN-NUERNBERG UNIV (GERMANY F R)
|
| This report results from a contract tasking University of Erlangen- Nuremberg as follows: The contractor will investigate triangular arrays of Josephson tunnel junctions which have proven suitable for high frequency applications in the mm and sub-mm range. Yukon (AFRL) and Lin have designed an active antenna array based on 2D triangular arrays as oscillators. Synchronization between the oscillators (or sub-arrays) is provided by a phase shifter consisting of a parallel ... |
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| Multivariable Control, Simulation, Optimization, and Signal Processing for the Microlithographic Process |
JUN 2001 |
25 pages |
| Authors:
Thomas Kailath; STANFORD UNIV CA INFORMATION SYSTEMS LAB
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| The objective of this Multidisciplinary University Research Initiative (MURI) program is to apply multivariable control, simulation, optimization and signal processing techniques to the microlithography sequence. |
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| The Growth and Characterization of Ferrite-High Temperature Superconductor Thin Films for Microwave Devices |
25 DEC 2000 |
31 pages |
| Authors:
Robin J. Kennedy; FLORIDA AGRICULTURAL AND MECHANICAL UNIV TALLAHASSEE DEPT OF PHYSICS
|
| In an effort to integrate superconducting, conducting, ferrite and insulating thin films to produce microwave devices such as phase shifters and circulators, thin films (single and bi-layer) of ferrites (Strontium Hexaferrite, Fe3O4), superconductors (YBa2Cu3O7-x), buffer layers (MgO), and ground planes (SrRuO3, CaRuO3) were grown by the technique of laser ablation on semiconducting (Si, GaAs), ferrite (YIG), and insulating (LaAlO3) substrates. All films grown were epitaxial as shown by 4 circle ... |
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| Millimeter-Wave Quasi-Optical MEMS Steered MMIC Amplifier Array |
10 DEC 2000 |
27 pages |
| Authors:
Hercules P. Neves; Warren Wright; CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING
|
| The development of a 44 GHz MEMS-steered solid-state amplifier array with 100 active elements has been studied. The array has a layered geometry with 10 layers of microstrip circuitry, each containing 10 amplifier/MEMS phase shifter elements configured in parallel as a power combining microstrip/parallel plate waveguide combiner. The final strategy for the grating array and layer array amplifiers was implemented and tested. This involved the construction of a compact array ... |
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| Micropatch Antenna Phase Shifting |
31 AUG 2000 |
16 pages |
| Authors:
Michael Thursby; FLORIDA INST OF TECH MELBOURNE
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| The Micropatch antenna is a ubiquitious entity which is more and more being used in arrays to form beams for communication from one point to another. To accomplish this one needs to be able to make the patch as flexible as possible. And at the same time be able to reliably form the beam of the antenna array. We have been looking at the ability of embedded element to adjust ... |
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| Measurement Results of an Affordable Hybrid Phased Array Using a Radant Lens |
15 MAY 2000 |
32 pages |
| Authors:
J. B. Rao; S. M. Brockett; J. B. Evins; M. Parent; J. Valenzi; NAVAL RESEARCH LAB WASHINGTON DC ADVANCED RADAR SYSTEMS BRANCH
|
| An affordable phased array for a ship self-defense experimental engagement radar is described. The array used a hybrid approach by combining a slotted waveguide array with phase shifters at each column to provide scanning in the azimuth plane and a Radant lens placed in front of the slotted array to provide independent scanning in the elevation plane. The approach avoids using a phase shifter or a ... |
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| Experiments with Mutually Coupled Arrays of Josephson Junctions |
20 APR 2000 |
19 pages |
| Authors:
Alexey Ustinov; ERLANGEN-NUERNBERG UNIV (GERMANY F R)
|
| This report results from a contract tasking University of Erlangen- Nuremberg as follows: The contractor shall investigate triangular arrays of Josephson tunnel junctions which have shown to be suitable for high frequency applications in the mm and sub-mm range. Yukon (AFRL) and Lin have designed an active antenna array based on 2D triangular arrays as oscillators. Synchronization between the oscillators (or sub arrays) is ... |
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| RF Photonics for Phased-Arrays |
31 OCT 1999 |
73 pages |
| Authors:
Robert York; CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The initial goals of this project were to examine and develop practical photonic technologies suitable for shared aperture phased array environments. This effort resulted in an integrated optically variable capacitor (OVC) technology which can be implemented in a variety of RF circuit and radiating structures for optical control. This technology was developed using monolithic GaAs based photovoltaic devices and varactors developed at UCSB. A novel integration scheme and circuit were ... |
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| Voltage-Controlled Ferroelectric Lens Phased Arrays |
23 SEP 1998 |
50 pages |
| Authors:
J. B. Rao; D. P. Patel; V. Krichevsky; NAVAL RESEARCH LAB WASHINGTON DC RADARANALYSIS BRANCH
|
| A new concept for phased arrays is proposed using a voltage- controlled ferroelectric lens. The ferroelectric lens concept uniquely incorporates bulk phase shifting; the array does not contain individual phase shifters but uses ferroelectric material. This will reduce the number of phase shifters from (n x m) to (n + m), where n is the number of columns and m is the number of rows in a phased array. The ... |
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| Optically Controlled Phased Array Antenna |
APR 1998 |
26 pages |
| Authors:
David A. Garafalo; AIR FORCE RESEARCH LAB ROME NY
|
| An optically controlled phased array antenna developed by Hughes Aircraft under a DARPA/Rome Laboratory research program was tested at the Rome Laboratory Newport Test Site. The first round of tests were conducted in June/ July 1993 and the second round of tests were in May/October 1996. The antenna is a 3-foot by 9 foot phased array capable of a scan angle of 120 degrees. The antenna was designed to be ... |
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| Fast, High Power Microwave Components Based on Beam Generated Plasmas |
19 JAN 1998 |
22 pages |
| Authors:
Wallace M. Manheimer; NAVAL RESEARCH LAB WASHINGTON DC FUNDAMENTAL PLASMA PROCESSES
|
| It is shown that the agile mirror plasma, under development as a device to simply and cheaply give electronic steering to microwave beams, also has application as a fast, electronically controlled, high power reflector or phase shifter. In a radar system, this can lead to such applications as pulse to pulse polarization agility and electronic control of antenna gain, as well as to innovative approaches to high power millimeter wave ... |
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| Thermally Durable Glass-Ceramic Matrix Composites |
14 NOV 1997 |
204 pages |
| Authors:
CORNING INC NY
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| A Novel Millimeter-Wave, Low-Loss, Electronically Controlled Phase Shifter for Monolithic, Beam-Steering Phased-Array Antenna Application |
MAR 97 |
25 pages |
| Authors:
Kamal Sarabandi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this document is to summarize the accomplishments made on the project entitled "A Novel Millimeter-Wave, Low-Loss, Electronically Controlled Phase Shifter for Monolithic, Beam-Steering Phased-Array Antenna Application,'1 regarding contruction of a millimeter-wave electronically controlled phase shifter funded by ONR under contract NOOOl4-96-l-ll2O. Our activities in this pilot project can be categorized into two major areas: (1) theoretical analysis, and (2) experimental and development of fabrication methodology. Significant progress ... |
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| Development and Design of Digital RF Memory |
25 NOV 96 |
10 pages |
| Authors:
Luo Ying; Tang Shensheng; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| Digital radio frequency memory (DRFM) technology is capable of application in a good number of realms. In particular, in electronic countermeasure systems, it possesses the capability to carry out the acquisition and storage of received threat signals as well as capabilities associated with the precise control of wave forms for purposes of deception, and, in conjunction with that, obtaining the radiation to the threat object. ANNOTATION: Development and Design of ... |
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| MicroElectro Mechanical Millimeter-Wave Control Devices for Affordable Scanning Antennas. SBIR Phase I |
NOV 96 |
25 pages |
| Authors:
H. J. Kono; QUINSTAR TECHNOLOGY INC TORRANCE CA
|
| Report developed under SBIR contract. investigate The objective of the Phase I effort of this project was to and demonstrate the feasibility of the novel MicroElectroMechanical (MEM) control device technology for millimeter-wave systems, such as phased array radars and wideband communication systems. During Phase I, MEM SPST and SPDT switches, and single bit phase shifters have been designed, developed, fabricated, and tested. The MEM control devices have successfully been operated ... |
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| Photonic True Time Delay Beamformer for a 20 Element L-Band Phased Array |
OCT 96 |
111 pages |
| Authors:
Paul M. Payson; John E. Malowicki; Herbert W. Klumpe III; Edward N. Toughlian; Henry Zmuda; ROME LAB ROME NY
|
| A phased array is a directive antenna made up of individual radiating elements which generate a radiation pattern whose shape and direction are determined by the relative phases and amplitudes of the currents at the individual elements. Current state of the art phased array radars implement electronic phase shifters for beamforming. The limitation of the phase shifters becomes apparent if multiple frequencies are transmitted simultaneously. The energy associated with the ... |
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| Circularly Polarized Dual Frequency Lightweight Deployable Antenna System. |
21 MAY 1996 |
|
| Authors:
Paul M. Mileski; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A deployable antenna assembly includes a canister providing an elongated chamber and an elongated hollow mast with a mounting member on its upper end. A coaxial cable extends into the hollow mast to provide radio signals to the antenna assembly of four antenna members of resiliently deflectable members spaced at 90 degree intervals about the periphery of a mounting plate. In the non-deployed position elongated arms extend downward along the ... |
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| Investigation of an Ultra-Fast All-Optical Self-Clocked Demultiplexer |
MAY 96 |
18 pages |
| Authors:
Paul Prucnal; PRINCETON UNIV NJ
|
| Terahertz optical demultiplexers are required for ultrafast time domain optical switching and processing. This work describes the development of a new interferometric based all optical switching element that performs this ultrahigh bandwidth function. The component is based on a Mach Zehnder configuration with two spatially offset semiconductor optical amplifiers on the internal arms of the interferometer that act as nonlinear optical elements. This offset and functionality perform the necessary task ... |
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| Design of a High-Resolution, Coded, Portable Radar System |
MAY 96 |
23 pages |
| Authors:
Falih H. Ahmad; James A. Evans; Ernest L. Miller; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| This report describes the design of a hand-held, portable, microprocessor- controlled, high-resolution radar (HRPR). This report, however, does not include the design of the transmitting and receiving antennas. The high-resolution radar system is designed to be portable, hand held, and microprocessor controlled. The generated carrier is an exponentially decaying sinusoidal wave with a frequency in the GHz range. In this high- resolution radar, analog-to-digital conversion is performed through an integrated ... |
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| Millimeter-Wave Quasi-Optical Planar Circuits and Power Combining. |
15 JAN 1996 |
82 pages |
| Authors:
Kai Chang; TEXAS A AND M UNIV COLLEGE STATION DEPT OF ELECTRICAL ENGINEERING
|
| This report summarizes the research activities carried out in the Electromagnetics and Microwave Laboratory, Department of Electrical Engineering, Texas A&M University. The project was sponsored by the U.S. Army Research Office under contract No. DAAL03-92-G-0326. The topics of investigation included integrated and active antenna elements, spatial power combining and beam steering, quasioptical components, novel uniplanar slotline and coplanar waveguide circuits, and other circuit developments and analyses. This final report for ... |
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| Low cost Phased Arrays |
24 NOV 95 |
29 pages |
| Authors:
J. B. Rao; NAVAL RESEARCH LAB WASHINGTON DC
|
| In a phased array antenna the phase shifters (or TIR modules in active aperture phased arrays) with their beam steering control circuitry along with the feed network, account for major hardware cost. This report examines a number of antenna array configurations that use simpler feeds, simpler phase shifting and beam steering control circuitry for realizing low cost phased arrays. Two lens configurations, one using diode strips (Radant) and another using ... |
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| MTI Using a Polyphase Code. |
31 OCT 1995 |
|
| Authors:
Frank F. Kretschmer Jr; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An improved MTI radar system including a signal expander/compressor for providing palindromic P2 phase coded upswept and downswept expanded signals that are alternately transmitted by a radar transmitter. The echos from the upswept and downswept signals are received by a receiver, compressed in the signal expander compressor and inputted to an MTI subtractor. Since the autocorrelation sidelobes of the palindromic phase coded echos are real, the echos from stationary clutter ... |
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| Comparison of Fiber-Optic and a P-I-N Diode RF Phase Shifter |
30 SEP 95 |
24 pages |
| Authors:
James L. Dexter; Ciaran J. Murphy; NAVAL RESEARCH LAB WASHINGTON DC
|
| The performance of a conventional p-i-n diode microwave phase shifter is directly compared, in this report, to that of a fiber-optic microwave phase shifters. The fiber-optic system is based upon the technique of fiber stretching, which produces a continuous true-time delay in contrast to the discrete nature of tne p-i-n diode phase shifter. The proliferation of microwave fiber-optic links has driven the effort to develop fiber-optic equivalents to standard microwave ... |
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| Center-Fed Multifilar Helix Antenna. |
12 SEP 1995 |
|
| Authors:
Chang S. Kim; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An antenna system including a phasing circuit for producing balanced, phase displaced, signals for connection to an antenna. The antenna comprises, for each set of balanced phase signals, a pair of antenna elements disposed serially along a helical path. A transmission line, connected to each of the phasing circuit terminals, drives each antenna element pair at a center location by being connected to the proximate ends of each pair. The ... |
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| Noise Control Composite. |
30 MAY 1995 |
|
| Authors:
Eugene C. Fischer; Jean A. Montemarano; Vincent J. Castelli; Joseph W. Dickey; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A composite for use on submarines and surface craft for controlling self-generated noise when listening with sonar. The composite includes two layers of PVF2 transducers separated by a layer of phase shifting or absorbing material. The inner transducer senses noise from the ship and subtracts this from the signal from the outer transducer representing noise plus the desired signal. In a second mode the sensed noise is regenerated through the ... |
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| Thick Film Fabrication of Ferroelectric Phase Shifter Materials |
MAY 95 |
16 pages |
| Authors:
L. C. Sengupta; S. Stowell; E. Ngo; M. E. Molongoski; ARMY RESEARCH LAB WATERTOWN MA MATERIALS DIRECTORATE
|
| Various composites of BSTO combined with other non-electrically active oxide ceramics have been formulated. In general, the composites have adjustable electronic properties which can be tailored for use in phased array antennas and other phase shifting devices. The dielectric constant and the loss tangents have been reduced to enhance the overall impedance matching and thereby lowering the insertion toss of the device. In addition, the overall tunability, the change in ... |
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| Phase Control of a Microstrip Patch Antenna |
30 APR 95 |
22 pages |
| Authors:
Michael H. Thursby; FLORIDA INST OF TECH MELBOURNE
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| Under this Air Force grant we have begun the investigation into the ability of the embedded impedance elements to control the far field phase of an individual element with the anticipation that this element can be incorporated into an array and used in a manner of similar to phase steered array using external phase shifters. The advantage of this approach is that the phase shifting devices are embedded in the ... |
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| Fabrication and Characterization of BSTO and Nonferroelectric Oxide Composites for Use in Phased Array Antennas and Other Electronic Devices |
DEC 94 |
18 pages |
| Authors:
L. C. Sengupta; E. Ngo; M. E. O'Day; S. Stowell; R. Lancto; ARMY RESEARCH LAB WATERTOWN MA MATERIALS DIRECTORATE
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| A ceramic ferroelectric phase shifting device has been demonstrated using Ba(1-x)Sr(x)TiO3 (BSTO) ceramics. As a part of an effort to optimize the electronic device performance in the phase shifter, various composites of BSTO combined with other nonelectrically active oxide ceramics have been formulated. In general, the composites have reduced dielectric constants, epsilon', where epsilon = epsilon' = i(epsilon)', and loss tangents, tan delta. The low dielectric constant and low loss ... |
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| HTS for Electronic Warfare Applications |
22 SEP 94 |
77 pages |
| Authors:
TRW SPACE AND ELECTRONICS GROUP REDONDO BEACH CA
|
| This final report describes the results achieved on the High Temperature Superconductors for Electronic Warfare Applications program. The objective of this program was to demonstrate beamforming network (BFN) components using High Temperature superconductors (HTS) operating between 50 and 70 K from 2-18 GHz intended for Electronic Warfare (EW) subsystems for early insertion. In particular, this program addressed three tasks; the first task developed the HTS processes required for the beamforming ... |
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Reports by Keyword(s)
PHASE SHIFT CIRCUITS
