| Radar Array Signal Processing in the Presence of Scattering Effects |
15 JAN 2008 |
12 pages |
| Authors:
Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
 | We developed statistical time-reversal imaging and Cramer-Rao bounds (ORB's) for point targets and scatterers; realistic clutter modeling, random scattering reflections, compound Gaussian distributions, and signal dependence; maximum likelihood estimators, CRB's, and sequential target detectors in compoun%Gaussian clutter; polarimetric radar algorithms for detectingltracking targets in clutter; microstrip antennas design with suppressed radiation in horizontal directions and reduced coupling, and 6D vector antenna; optimal synthesis of a directional beam with full polarization ... |
|
| Performance Assessment: University of Michigan Meta-Material-Backed Patch Antenna |
JAN 2007 |
11 pages |
| Authors:
Robert Dahlstrom; Steve Weiss; ARMY RESEARCH LAB ADELPHI MD
|
| This report describes measurements performed on a meta-material-backed patch antenna designed and fabricated at the University of Michigan for use by CERDEC. The purpose of the measurements was to resolve inconsistencies between the performance measured at these two organizations. The antenna consists of a microstrip patch, with a broad-banding slot, backed by a reactive impedance surface. The gain and impedance characteristics of the meta-material-backed patch antenna were found to be ... |
|
| Polyomino Shaped Subarrays for Limited Field of View and Time Delay Control of Planar Arrays |
03 NOV 2006 |
10 pages |
| Authors:
R. J. Mailloux; S. G. Santarelli; T. M. Roberts; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| Phased array elements are often grouped into contiguous rectangular subarrays to reduce cost. This is done for two types of array applications. The first is for arrays that scan over only a limited sector, called limited field of view (LFOV) arrays. These use one phase shifter for each group of elements (subarray), and no phase shifters within the subarray. The second application is for arrays that scan over wide angles ... |
|
| A Commemoration of Deschamps' and Sichak's "Microstrip Microwave Antennas": 50 Years of Development, Divergence, and New Directions |
01 NOV 2006 |
35 pages |
| Authors:
J. T. Bernhard; P. E. Mayes; D. Schaubert; R. J. Mailloux; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| Fifty years ago, the Third Symposium on the USAF Research and Development Program was held at Robert Allerton Park. During this symposium Deschamps and Sichak, working for the Federal Telecommunications Laboratory, presented their work entitled Microstrip Microwave Antennas. Here we commemorate this now declassified work, often cited as the first microstrip antenna paper, by reflecting upon it in the light of significant advances in microstrip antenna theory and design that ... |
|
| FE-BI Analysis of a Leaky-Wave Antenna With Resistive Sheet Termination (Postprint) |
JUL 2006 |
6 pages |
| Authors:
Leo Kempel; Steve Schneider; Joshua Radcliffe; Dan Janning; Gary Thiele; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| Printed leaky-wave antennas offer the potential for a low-profile, wide-bandwidth antenna element that can be arrayed if desired. Microstrip leaky-wave antennas rely on the suppression of the familiar EH0 mode and the propagation of the radiating EH1 mode. It is well-known that above a critical frequency, this leaky-wave will propagate with little attenuation and that the phase difference between the two radiating edges of the microstrip leads to radiation. However, ... |
|
| Modeling of Power Combining in Microstrips with Active Devices for THz Applications |
29 AUG 2005 |
27 pages |
| Authors:
Vladimir Yurchenko; NATIONAL UNIV OF IRELAND MAYNOOTH (IRELAND)
|
| This report results from a contract tasking National University of Ireland as follows: The Grantee will investigate methods to increase power output of THz arrays. Simulations will be used to build models of various array structures. |
|
| Design and Analysis of a Yagi-Like Antenna Element Buried in LTCC Material for AEHF Communication Systems |
24 AUG 2005 |
|
| Authors:
Michel Clenet; DEFENCE RESEARCH AND DEVELOPMENT CANADAOTTAWA (ONTARIO)
|
 | This document presents the investigation of an end-fire antenna implemented in a laminated material named LTCC (Low Temperature Co-fired Ceramic). This study is related to the development of a phased array for the AEHF Military Satellite Communication Systems. This work includes the design, the analysis, fabrication and the measurement of antenna prototypes at 44.5 GHz. The radiating element consists of a Yagi-like antenna fed by a microstrip transmission line and ... |
|
| Study of Reconfigurable Printed Antennas for GPS Applications |
MAR 2005 |
10 pages |
| Authors:
Robert G. Rojas; Nuttawit Surittikul; K. W. Lee; Siddharth Iyer; OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
|
| This report addresses issues concerning the design, analysis and implementation of circularly polarized pattern reconfigurable printed antennas. Single and multi-layer dual band staked microstrip patches mounted on substrates/superstrates of square and octagonal shape are proposed for GPS applications. Another objective of the research described here was also to develop an accurate model for the analysis and design of switching circuits for pattern reconfigurable antennas. Modeling of all switch circuit components ... |
|
| FE-BI Analysis of a Leaky-Wave Antenna with Resistive Sheet Termination |
01 JAN 2005 |
5 pages |
| Authors:
Leo Kempel; Steve Schneider; Joshua Radcliff; Dan Janning; Gary Thiele; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| Printed leaky-wave antennas offer the potential for a low-profile. wide-bandwidth antenna element that can be arrayed if desired. Microstrip leaky-wave antennas rely on the suppression of the familiar EH0 mode and the propagation of the radiating EH1 mode. It is well-known that above a critical frequency. this leaky-wave will propagate with little attenuation and that the phase difference between the two radiating edges of the microstrip leads to radiation. However, ... |
|
| Microstrip Patch Radiating Elements for Circularly-Polarized Phased Array |
2005 |
|
| Authors:
Paul G. Elliot; Mohamed S. Mahmoud; MITRE CORP BEDFORD MA
|
| This report evaluates circularly-polarized single-probe fed microstrip patch radiating elements for a low profile phased array antenna. The design, measurements, and computer modeling results are described for two designs: one is a patent pending dual-slot on each side of the patch, and the other is a conventional single slot design. Antenna requirements also include: 14.40 to 15.35 GHz frequency band, 2 dB axial ratio, and low VSWR with scan. The ... |
|
| Bandwidth Limits and Other Considerations for Monostatic RCS Reduction by Virtual Shaping |
JAN 2004 |
24 pages |
| Authors:
J. R. Swandic; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTURES AND MATERIALS DIRECTORATE
|
| This work addresses some major issues in the adaptation and application of microstrip patch antenna and reflectarray technology to radar cross section reduction by virtual shaping. We define virtual shaping to be any technique used to cause the shape and orientation of an object as it affects a scattered radar signal to differ from the actual physical shape and orientation of the object. This is accomplished by introducing a linear ... |
|
| LLAMA (Lincoln Laboratory Advanced MARTHA Applications) Software Manual |
01 DEC 2003 |
|
| Authors:
D. W. White; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| For the past 25 years or more, a number of staff members at MIT lincoln Laboratory have made extensive use of the APL computer language to solve a variety of problems, primarily in the area of radio frequency and microwave circuit design. This was aided and inspired by the availability of the MARTHA software package, which is a collection of APL-based circuit analysis functions developed by Professor Paul Penfield Jr. ... |
|
| Development of Artificial Y-Type Hexaferrites |
01 MAY 2003 |
2 pages |
| Authors:
C. Vittoria; NORTHEASTERN UNIV BOSTON MA
|
| We have developed a technique to orient particles of Y-type hexaferrite in which the c-axis of the particles are oriented perpendicular to a plane As such, that plane becomes necessarily the easy plane of magnetization. For microwave device application the easy plane of magnetization is chosen as the plane to deposit a metallic microstrip and related circuit patterns. The technique entails the rotation of an external magnetic field in the ... |
|
| The Ferroelectric Slab Waveguide: A Geometry for Microwave Components That Incorporate Ferroelectric Materials |
03 APR 2003 |
|
| Authors:
Frank J. Crowne; Steven C. Tidrow; ARMY RESEARCH LAB ADELPHI MD RF ELECTRONICS DIV
|
| A slab geometry, in which ferroelectric is inserted between two "cladding" layers with a microstrip electrode placed on top, is proposed as a way to integrate the properties of ferroelectric materials into microwave components. This structure distributes the propagating microwave fields between the ferroelectric and the cladding, so that the microwave dielectric constant is a weighted average of the dielectric constants of the two materials. It is shown that this ... |
|
| Microstrip Patch Antenna with Progressive Slot Loading |
27 JAN 2003 |
11 pages |
| Authors:
David A. Tonn; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
|
| A microstrip patch antenna with progressive slot loading is provided. A rectangular patch of electrically conductive material has a plurality of slots formed therein with each slot having its center aligned with the centerline of the patch's long dimension. Each slot further has its longitudinal axis perpendicular to the centerline. The slots are arranged in an order starting at a position n=1 that is furthest from the patch's feedpoint so ... |
|
| Proceedings of the 2000 Antenna Applications Symposium. Volume 2 |
11 FEB 2002 |
164 pages |
| Authors:
Daniels H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2000 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF, and various other antennas. |
|
| Proceedings of the 2000 Antenna Applications Symposium. Volume 1 |
11 FEB 2002 |
255 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2000 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF, and various other antennas. |
|
| Proceedings of the 2001 Antenna Applications Symposium. Volume 1 |
11 FEB 2002 |
243 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The proceedings of the 2001 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, Reconfigurable Antennas, Microstrip Antennas, Fractal Antennas. |
|
| Proceedings of the 2001 Antenna Applications Symposium. Volume 2 |
11 FEB 2002 |
365 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The proceedings of the 2001 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, Reconfigurable Antennas, Microstrip Antennas, Fractal Antennas. |
|
| High-Q Tunable Microwave Superconducting Strip-Line Filters |
31 JAN 2002 |
14 pages |
| Authors:
Anderson; TRS CERAMICS INC STATE COLLEGE PA
|
| The goal of this project is to prove the feasibility of high Q tunable actuators to be used at cryogenic temperatures. The end result is to include a tunable resonator structure fabricated with superconducting materials utilizing piezoelectric materials to provide tunability. |
|
| Application of Model-Based Signal Processing and Genetic Algorithms for Shipboard Antenna Design, Placement Optimization |
31 JAN 2002 |
161 pages |
| Authors:
Hao Ling; TEXAS UNIV AT AUSTIN DEPT OF ELECTRICALAND COMPUTER ENGINEERING
|
| This report summarizes the scientific progress on the research grant "Application of Model-Based Signal Processing and Genetic Algorithms for Shipboard Antenna Design, Placement and Optimization" during the period 1 December 2000 - 30 November 2001. Progress on using genetic algorithms in conjunction with computational electromagnetics for microstrip antenna design, array beamforming, microwave absorber shaping and electrically small wire antenna design is described. |
|
| Investigation of a New Class of Low-Profile Multi-Layer Printed Antennas |
OCT 2001 |
32 pages |
| Authors:
Ahmad Hoorfar; VILLANOVA UNIV PA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The annual reports, previously submitted to the ONR in 1998, 1999 and 2000, have detailed most of our research work on this project. The present report only covers the progress made during the October 2000 - September 2001 interim period. We have made progress in the following area: (1) The previously developed multi-layered gain enhancement technique for printed antennas has been extended to design of proximity-fed and aperture-fed antennas for ... |
|
| Studies of High-T sub c Superconducting Films for High-Power Microwave Applications |
11 SEP 2001 |
|
| Authors:
M. S. Dresselhaus; D. Oates; S. Sridhar; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| During the period of this grant, October 15, 1997-April 14, 2001, characterization has been carried out in order to understand microwave properties of grain boundaries. Measurements in an externally applied dc magnetic field in addition to the rf field of the stripline resonator. Intermodulation distortion measurements have also been carried out as a function of the grain boundary angle. The measurements in external magnetic fields require the use of a ... |
|
| Observation of THz Oscillations and Efficient THz Emission from Contacted Low Temperature Grown GaAs Structures |
29 SEP 2000 |
4 pages |
| Authors:
Christian Steen; Sonke Tautz; Peter Kiesel; S. U. Dankowski; Gottfied H. Doehler; ERLANGEN-NUERNBERG UNIV (GERMANY) INSTFUER TECHNISCHE PHYSIK
|
| We have performed femtosecond differential transmission experiments in low temperature grown GaAs (LT-GaAs) layers under high electric fields. The fields were induced by voltages up to 60 V applied to interdigitated contacts with a few micrometer period. Up to about 10 oscillations of the field-induced transmission changes with a period of T = 2.2 Ps were detected in a structure where the high-frequency effective length of the contacts was kept ... |
|
| Low-Dispersive Coplanar Waveguides and Thin-Film Microstrip Lines for Sub-mm Wave Monolithic Integration |
29 SEP 2000 |
4 pages |
| Authors:
Frank Schnieder; Wolfgang Heinrich; FERDINAND-BRAUN-INST FUER HOECHSTFREQUENZTECHNIK BERLIN (GERMANY)
|
| Planar sub-millimeterwave transmission-line structures suitable for monolithic integration are discussed. The results show that both miniaturized coplanar waveguides and appropriate thin-film microstrip configurations provide low-dispersive propagation properties up to 1 THz. The paper discusses radiation and dispersion effects as well as basic rules how CPWs should be designed in order to reach the desired sub-mm wave performance. |
|
| Applied Computational Electromagnetics Society Journal. Special Issue on Computational Electromagnetic Techniques in Mobile Wireless Communications. Volume 15, Number 3, 2000 |
2000 |
145 pages |
| Authors:
Ray Perez; Chris Holloway; Ahmed Kishk; Allen Glisson; MISSISSIPPI UNIV UNIVERSITY DEPT OF ELECTRICAL ENGINEERING
|
| TABLE OF CONTENTS: A Random Phase Assisted Ray Tracing Technique for Wireless Channel Modeling; Nanocells Intrasystem Interference Realistic Worst Case Analysis for Open Site Personnal Communication Scenarios; Designing Embedded Antennas for Bluetooth Protocol; Analysis and Design of Tapered Meander Line Antennas for Mobile Communications; A Cole-Cole Diagram Representation of Micro strip Structure; Enhancement of Numerical Computation Methods Useful for Radio Communication Antenna Systems; Time and Frequency Domain Wave Propagators; Ray ... |
|
| Design and Optimization of a Wideband Printed-Dipole Array |
NOV 1999 |
|
| Authors:
B. G. Duffley; G. A. Morin; Y. M. M. Antar; ROYAL MILITARY COLL OF CANADA KINGSTON(ONTARIO)
|
| Modem satellite and mobile communications systems continue to push the bandwidth requirement of antenna subsystems. Printed microstrip architectures have been widely investigated and are attractive for their conformability, small size and cost effectiveness. While vigorous research activity over the past two decades has improved the bandwidth of microstrip elements to upwards of 30%, this may not be adequate for the future system demands ... |
|
| Telemetry and GPS Antennas for a Micro Air Vehicle |
SEP 1999 |
79 pages |
| Authors:
Emin Guven; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis presents telemetry and GPS antenna designs for a Micro Air Vehicle (MAV). The telemetry antenna type is selected as a monopole, which is to be mounted under the bottom of MAV. A prototype of the telemetry antenna was designed, built, and tested at 2.45 GHz. For the UPS antenna, several types of antennas were examined. Helix, conical spiral, tripole, and crossed-dipole antenna types were designed and simulated using ... |
|
| Proceedings of the 1999 Antenna Applications Symposium Volume 1 |
SEP 1999 |
287 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1999 Antenna Applications Symposium is a collection of state-of-the-an papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Proceedings of the 1999 Antenna Applications Symposium Volume 2 |
SEP 1999 |
267 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1999 Antenna Applications Symposium is a collection of state-of-the-an papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Microstrip Dual Mode Elliptic Filter with Modal Coupling Through Patch Spacing |
17 AUG 1999 |
|
| Authors:
Preston W. Grounds III; Kawthar A. Zaki; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Disclosed is a planar dual mode microstrip filter with the coupling between similar modes on different patches governed by the spacing between the patches rather than by microstrip coupling lines between the patches. The patches are shaped to allow dual mode coupling. The materials used in building this filter were an alumina substrate with gold metalization. The filter is encased in a conducting box made from a conducting material. One ... |
|
| Study of a Novel Adaptive Printed Antenna Element for GPS Applications |
MAR 1999 |
94 pages |
| Authors:
R. G. Rojas; K. W. Lee; OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
|
| This report discusses the development of a novel adaptive printed antenna element for GPS applications. This antenna element consists of a microstrip patch antenna and several diode-loaded parasitic metallic strips on top of the dielectric substrate. It is shown through computer simulations that the beamwith of the antenna can be modified by turning the diodes on or off. This implies that the radiated pattern level can be modified along the ... |
|
| Microwave Applications of Photonic Band-Gap (PBG) Structures |
1999 |
5 pages |
| Authors:
Yongxi Zian; Tatsuo Itoh; CALIFORNIA UNIV LOS ANGELES
|
| Photonic band-gap (PBG) structures are essentially periodic lattices which can provide effective and flexible control of the propagation of electromagnetic waves along specific or all directions. This paper gives an overview of a novel planar-oriented PBG structure developed recently at the authors group. This uniplanar compact PBG (UC-PBG) lattice is very simple to implement, and its usefulness has been demonstrated successfully by several application examples such as low and band ... |
|
| Technology Development for Multilayered Microwave and Millimeter Wave Integrated Circuits |
31 OCT 1998 |
15 pages |
| Authors:
N. K. Das; D. M. Bolle; POLYTECHNIC UNIV BROOKLYN NY DEPT OF ELECTRICAL ENGINEERING
|
| During the last three years of research we have contributed to the technology development for multilayer microwave/millimeter wave integrated circuits (multilayer MMICs) of the future. Such multilevel integration would allow implementation of smaller sized, higher density, and multi-functional microwave/millimeter wave circuits and systems, that are more reliable and cost effective. Specifically, we have (1) investigated new transmission media that are better suited for multilayer integration, where conventional techniques may not ... |
|
| Proceedings of the 1997 Antenna Applications Symposium |
JUL 1998 |
317 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1997 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Optimized Design Methodology of Cavity-Backed Microstrip Antennas with Dielectric Overlays |
DEC 97 |
138 pages |
| Authors:
Douglas Joseph Hermes; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| The optimized design methodology implemented in this research employs a design methodology, namely Response Surface Methodology (RSM), that is relatively new to the electromagnetics field. The design methodology used a full factorial designed experiment, a Hybrid Finite Element Method (HFEM) analysis code, a cubic spline empirical model, an Analysis of Variance (ANOVA) test, and a simplex optimization code to successfully measure, predict, analyze, and optimize average antenna gain and antenna ... |
|
| Thermally Durable Glass-Ceramic Matrix Composites |
14 NOV 1997 |
204 pages |
| Authors:
CORNING INC NY
|
|
| Proceedings of the 1996 Antenna Applications Symposium |
OCT 1997 |
492 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1996 Antenna Applications Symposium is a collection of state-of-the art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Monolithic Millimeter-Wave Radiating Systems and Feed Networks |
OCT 97 |
24 pages |
| Authors:
David R. Jackson; Stuart A. Long; Jeffrey T. Williams; RICE UNIV HOUSTON TX DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The unifying theme of the research undertaken during the course of this contract is the design of monolithic antennas suitable for millimeter wave operation, and also certain aspects of feed network design at millimeter wave frequencies. The main focus of the antenna design projects was the investigation of planar leaky wave antennas consisting of either dielectric layers or periodic screens. These antennas offer the advantages of simplicity and efficiency at ... |
|
| Investigation of a Modular Antenna Array Configuration and a Feeding Technique for Brick Architecture |
SEP 1997 |
|
| Authors:
J. P. Garant; Gilbert A. Morin; Yahia M. Antar; David J. Roscoe; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The satellite communications industry, following the trends seen in personal communications systems, is pursuing the development of smaller and more capable communication terminals. Several antenna technologies and architectures have been studied for a fixed-beam portable communications terminal operating at high frequencies, e.g. 20GHz (receive) and 30GHz (transmit), and capable of providing multiple data links (data, voice, video). However, additional work is required to develop a modular "brick" type of architecture ... |
|
| Unified Methodology for Integrated Circuit Printed Antenna Array Design |
14 MAY 97 |
14 pages |
| Authors:
Nicolaos G. Alexopoulos; CALIFORNIA UNIV LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This research entailed the development of a unified methodology for integrated circuit, printed antenna, and printed antenna array design. Microwave antenna performance optimization may be achieved by shaping the antenna properly, as well as with the correct antenna excitation design. This final report presents a methodology for the design of 3-D microstrip fed arbitrarily shaped aperture and patch antennas in a multilayered medium. It includes the design of antenna excitation ... |
|
| Practical Implementation of the Hard Switched Buck Chopper |
MAR 97 |
138 pages |
| Authors:
Kirk D. Allen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| As the Navy progresses into the twenty-first century, new concepts in shipboard electrical power management are being explored. One area of significant interest to the Navy is utilization of DC electrical distribution systems rather than traditional AC distribution systems. The DC Zonal Electrical Distribution System is a prime candidate for direct application to modern power distribution. This system employs solid state conversion devices to supply ships loads from one of ... |
|
| Proceedings of Conference on Progress In Electromagnetics Research Symposium, PIERS 1997, Volumes 1 |
MAR 97 |
|
| Authors:
Zu-Han Gu; SURFACE OPTICS CORP SAN DIEGO CA
|
| The Progress in Electromagnetics Research Symposium (PIERS 1997) was held in Hong Kong, on the campus of the City University of Hong Kong, January 6- 9, 1997. More than 650 presentations were made, and those abstracts are included in this publication. |
|
| Towed Array With Non-Acoustic Sensor Module. |
21 JAN 1997 |
10 pages |
| Authors:
Kenneth P. Rainey; Joseph Liguore; Joseph Podurgiel; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A towed array includes an array of N hydrophone groups and one or more non-acoustic sensor modules structurally connected in-line with the array of hydrophone groups. The hydrophone groups and non-acoustic sensor module(s) are coupled to a common data transmission line. Each of the hydrophone groups defines a portion of an acoustic aperture occupying a specified length of the towed array. Each non-acoustic sensor module has a length that is ... |
|
| Applied Computational Electromagnetics Society Journal. Special Issue on International Computational Electromagnetics. Volume 12, Number 1 |
97 |
166 pages |
| Authors:
Joao P. Bastos; Adalbert Konrad; John Brauer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Partial contents: 3B Splines In the Integral Equation Solution for Scattering from Bodies of Revolution; Electromagnetic Properties of a Chiral Plasma Medium; MTRT - A Modified Transverse Resonance Technique; Effect of the Magnetic Anisotrophy on the Characteristics of Microstrip Antennas with Several Layers; Dispersive Analysis of Circular Cylindrical Microstrips and Backed Slotlines; Finite Element Analysis and Evaluation of Electromagnetic Fields Generated by Atmospheric Discharges; Point Matched Time Domain Finite Element ... |
|
| High Temperature Superconducting Microwave Switch |
DEC 96 |
98 pages |
| Authors:
Michael M. Neel; NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
|
| This report presents the design, construction, and testing of a high temperature superconducting microwave switch. The circuit is implemented in microstrip transmission line geometry and utilizes voltage and or current to create the switching action. Results of RF power limiting are also presented. |
|
| Design of the PHARUS Radome; Electrical Aspects |
NOV 96 |
|
| Authors:
M. H. Paquay; FYSISCH EN ELEKTRONISCH LAB TNO THE HAGUE (NETHERLANDS)
|
| A radome is an RF transparent window or lens in front of the antenna. Its purpose is to protect the antenna against harsh environmental conditions like moisture, (acid) rain, particles etc. An airborne system like PHARUS cannot do without a protective radome. PHARUS is an airborne full-polarimetric C-band SAR system for Remote Sensing applications. The antenna is a phased array, consisting of printed microstrip patch radiators. More information about PHARUS ... |
|
| Microwave Impedance Matching of Photodiodes for High Speed Optical Communications Systems |
JUL 96 |
39 pages |
| Authors:
David A. Sumberg; SUMBERG (DAVID A) CONSULTANTS ROCHESTER NY
|
| The performance of optical communications systems can be influenced by the mismatch between the low impedance laser source and the high impedance generator. A procedure is described here for matching a laser diode to a 50 ohm generator by means of a lossless equalizer network. The equalizer network is realized in the form of a microstrip adaptation of a ladder network consisting of inductor and capacitor equivalents. The mathematical model ... |
|
| Proceedings of the 1995 Antenna Applications Symposium. Volume 1 |
MAY 96 |
356 pages |
| Authors:
Daniel H. Schaubert; ROME LAB HANSCOM AFB MA
|
| The Proceedings of the 1995 Antenna Applications Symposium is a collection of state of the art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Proceedings of the 1995 Antenna Applications Symposium. Volume 2 |
MAY 96 |
328 pages |
| Authors:
Daniel H. Schaubert; ROME LAB HANSCOM AFB MA
|
| The Proceedings of the 1995 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
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