| Investigation of Frequency-Domain and Time-Domain Free-Space Material Measurements |
MAR 2006 |
76 pages |
| Authors:
Kirt J. Cassell; AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | Electromagnetic material characterization is the process of determining the complex permittivity and permeability of a test sample. The primary goal of this thesis is to develop a new two-transmission material measurement method to decrease the error associated with using a reflection measurement. The transmission method uses a sample transmission measurement and an acrylic-backed sample transmission measurement. This technique is first demonstrated in a rectangular waveguide system then extended to frequency-domain ... |
|
| Ultraviolet Light Disinfection in the Use of Individual Water Purification Devices |
MAR 2006 |
16 pages |
| Authors:
Steven Clarke; William Bettin; ARMY CENTER FOR HEALTH PROMOTION AND PREVENTIVE MEDICINE ABERDEEN PROVING GROUND MD
|
| Soldiers deployed beyond traditional field drinking water supplies must have access to microbiologically safe water. Using Individual Water Purification Devices (IWPDs) is one way to provide microbiologically safe water in these situations. These IWPDs must protect the Soldier from acute microbial health threats. Understanding the disinfection capabilities of ultraviolet (UV) light to inactivate disease-causing microorganisms is important in protecting Soldiers, who are considering using this technology, from acute health threats ... |
|
| A Transient Spice Model for Dielectric-Charging Effects in RF Mems Capacitive Switches (Preprint) |
MAR 2006 |
12 pages |
| Authors:
Xiaobin Yuan; James C. Hwang; David I. Forehand; Charles L. Goldsmith; MEMTRONICS PLANO TX
|
| A transient SPICE model for dielectric-charging effects in RF MEMS capacitive switches was developed and implemented in a popular microwave circuit simulator. In this implementation the dielectric-charging effects are represented by RC sub-circuits with the sub-circuit parameters extracted from directly measured charging and discharging currents in the pA range. The resulted model was used to simulate the actuation-voltage shift in RF MEMS capacitive switches due to repeated operation and charging ... |
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| WindSat Radio-Frequency Interference Signature and Its Identification Over Land and Ocean |
MAR 2006 |
11 pages |
| Authors:
L. Li; Peter W. Gaiser; Michael H. Bettenhausen; William Johnston; NAVAL RESEARCH LAB WASHINGTON DC
|
| Radio-frequency interference (RFI) in the spaceborne multichannel radiometer data of WindSat and the Advanced Microwave Scanning Radiometer EOS is currently being detected using a spectral difference technique. Such a technique does not explicitly utilize multichannel correlations of radiometer data, which are key information in separating RFI from natural radiations. Furthermore, it is not optimal for radiometer data observed over ocean regions due to the inherent large natural variability of spectral ... |
|
| Active Laser and Raman Materials for 1.3-5 Micron Spectral Range |
MAR 2006 |
183 pages |
| Authors:
Tasoltan Basiev; GENERAL PHYSICS INST MOSCOW (RUSSIA) LASER MATERIALS AND TECHNOLOGY RESEARCH CENTER
|
| This report results from a contract tasking General Physics Institute of the Russian Academy of Sciences as follows: The spectral range of 4 - 5 microns is one of the most interesting atmospheric optical transmission windows. High peak power laser sources operating in this region are of special importance for various lidar applications. Solid state lasers with their compactness, high efficiency, and reliability in rugged conditions are quite promising for ... |
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| WindSat On-Orbit Warm Load Calibration |
MAR 2006 |
15 pages |
| Authors:
Elizabeth M. Twarog; William E. Purdy; Peter W. Gaiser; Kwok H. Cheung; Bernard E. Kelm; NAVAL RESEARCH LAB WASHINGTON DC
|
| Postlaunch calibration of the WindSat polarimetric microwave radiometer indicates the presence of thermal gradients across the calibration warm load during some portions of the year. These gradients are caused by reflected solar illumination or eclipse and increase total calibration errors. This paper describes the WindSat warm load and presents the measured on-orbit data which clearly illustrate the anomalous responses seen in the warm load calibration data. Detailed thermal modeling predictions ... |
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| Compact, Coherent, and High-Power THz Sources and Applications |
25 FEB 2006 |
18 pages |
| Authors:
Yugie J. Ding; LEHIGH UNIV BETHLEHEM PA
|
| Within the last 12 months of the grant period, we had used our FTIR acquired from Bruker Optics via a DURIP grant to measure the transmission spectra of a few diatomic and triatomic molecules. As a result, we had observed distinct ro-vibrational and rotational transitions in carbon monoxide isotopic variants, nitrogen dioxide, and carbon dioxide. Furthermore, we had used the widely-tunable monochromatic THz source developed by us to measure the ... |
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| 192 GHz Push-Push VCO in 0.13-micrometer CMOS |
16 FEB 2006 |
3 pages |
| Authors:
C. Cao; E. Seok; K. K. O; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A 192 GHz cross-coupled push push voltage controlled oscillator (VCO) is fabricated using the UMC 0.13-micrometer CMOS logic process. The VCO can be tuned from 191.4 to 192.7 GHz. The VCO provides output power of ~--20 dBm and phase noise of ~--100 dBc/Hz at 10 MHz offset, while consuming 11 mA from a 1.5 V supply. |
|
| Sky Satellites: The Marine Corps' Solution to its Over-the-Horizon Communication Problem |
07-Feb-2006 |
12 pages |
| Authors:
D J Canestorp; MARINE CORPS UNIV QUANTICO VA
|
| During the last three years, the Marine Corps has seen an explosion of Satellite Communication (SatCom) assets being used in places like Iraq and Afghanistan. This increase in demand has caused a critical shortage of radio communication assets that can communicate across long distances and at the same time created a shortage of available radio frequencies for the radios to operate on. SatCom has its shortcomings even though it is ... |
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| Effect of Electrode Loss on the Dynamic Range of Linearized Directional Coupler Modulators |
01 FEB 2006 |
4 pages |
| Authors:
George A. Brost; Richard Michalak; Paul Payson; Kevin Magde; AIR FORCE RESEARCH LAB ROME NY
|
| Numerical simulations were used to study the effect of electrode loss on the two-tone spur-free dynamic range (SFDR) of analog photonic links with linearized directional coupler modulators. Radio-frequency loss in the traveling wave electrode significantly limits the frequency bandwidth over which this class of electrooptic modulator can effectively enhance the SFDR. |
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| Ultra Wide Band (UWB) Interference - Assessment and Mitigation Studies |
FEB 2006 |
85 pages |
| Authors:
Ivan Bradaric; Gerard T. Capraro; Donald D. Weiner; CAPRARO TECHNOLOGIES INC UTICA NY
|
| The objective of this study was to identify techniques for mitigation of Ultra Wide Band UWB, ElectroMagnetic Interference, EMI, generated by (commercial) communication equipment upon the reliable operation of GPS systems. |
|
| Matrix Dilations via Cosine-Sine Decomposition |
FEB 2006 |
28 pages |
| Authors:
J. C. Allen; D. Arceo; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| This report originated in the Eta (infinity) Research Initiative of the Office of Naval research and the In-House Laboratory Independent Research (ILIR) Program of Space and Naval Warfare Systems Center San Diego (SSC San Diego). These programs focused on Eta (infinity) engineering for fleet applications wideband impedance matching and wideband amplifier optimization. Research in these applications produced several papers [33], [32], [2], [3], four patents, a book [1], and sparked ... |
|
| What Is the Right RFID for Your Process? |
30-Jan-2006 |
78 pages |
| Authors:
Geraldo Ferrer; Nicholas Dew; Uday M Apte; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Radio Frequency Identification (RFID) has several applications in both military and civilian organizations. Numerous configurations are possible, and multiple new applications are envisioned in the near future. This paper uses the case method to study several RFID applications in multiple industries and to evaluate how this technology can be used to strengthen the process capabilities of an organization. The goals of this paper are to introduce RFID technology to a ... |
|
| A Model of Ablative Capillary Discharge (Preprint) |
04 JAN 2006 |
13 pages |
| Authors:
Leonid Pekker; Jean-Lue Cambier; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| An engineering model of a steady capillary plasma discharge is presented. Two regimes of operation are studied and compared, differing by the assumptions made in the treatment of the radiative fluxes. In the first case, the plasma density is high enough that the radiation Rosseland mean free path is smaller than the capillary radius; this case of black-body radiation leads to super-high pressures. In the second case, the radiation mean ... |
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| Block Copolymer Nanoarchitectures for Radio Frequency Applications |
JAN 2006 |
3 pages |
| Authors:
Peter Kofinas; MARYLAND UNIV COLLEGE PARK DEPT OF CHEMICAL ENGINEERING
|
| The goal of this research is to develop flexible polymeric nanocomposites having high permitivities and permeabilities for use in radio frequency (RF) applications. The nanocomposites are based on the self-assembly of block copolymers. A variety of mixed metal oxides of high dielectric constant and high magnetic susceptibility are templated within different block copolymer structures. Experiments with mixed oxides of Iron and Strontium have produced nanocomposites with low loss at high ... |
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| Transmitted Reference Ultra Wideband Transceivers for Multiuser Communication |
JAN 2006 |
42 pages |
| Authors:
Zhengyuan Xu; Brian M. Sadler; ARMY RESEARCH LAB ADELPHI MD
|
| A conventional transmitted reference (TR) modulation scheme is an effective means to combat severe multipath distortion in an ultra wideband (UWB) system, significantly relaxing the equalization requirements at a cost in performance. However, it suffers from multiple access and other interference, and a rate loss of 50%. In this paper we extend TR modulation to the multiuser case, while boosting data transmission to near full rate. To enable multiple access, ... |
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| Collaborative Research and Development Delivery Order 0024: Synthesis, Processing, and Evaluation of Polymers for RF Applications |
JAN 2006 |
17 pages |
| Authors:
Christy R. Vestal; UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| This research in support of the Air Force Research Laboratory Materials and Manufacturing Directorate was conducted at the Air Force Research Laboratory (AFRL) from 1 June 2004 through 31 December 2005. RF polymer nanocomposites containing ferrite nanoparticle and core/shell nanoparticles dispersed in polyurethane have been prepared. the permittivity in the X-band was found to increase with increasing nanoparticle volume inclusion and with increasing nanoparticle size. In the CoFeO4/FeO4 core/shell nanoparticle ... |
|
| Control of Hazards to Health From Laser Radiation |
JAN 2006 |
294 pages |
| Authors:
DEPARTMENT OF THE ARMY WASHINGTON DC
|
| This bulletin provides guidelines and establishes procedures for personnel protection from laser radiation within the framework of currently documented experimental evidence. Medical guidance is limited to biological data available. This bulletin encompasses the portion of the electromagnetic spectrum in which laser radiation can be produced including: ultraviolet (UV), visible light, and infrared (IR) radiation. |
|
| Multichannel + or - 1.16 KV Arbitrary Waveform Generator for Driving Multistage Ferroelectric Laser-Beam-Deflector |
Jan-2006 |
70 pages |
| Authors:
Fikri Muhammad; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Ferroelectric laser-beam-deflector has become one of the favorite devices for laser beam steering because of its ability to steer a laser beam without moving parts, its relatively high frequency of operation, and its large deflection angle. Furthermore, using multiple stages of ferroelectric beam deflector, the maximum deflection angle can be increased dramatically. However, these attractive features come with the cost of high drive-voltage requirement. Additionally, a multistage beam deflector requires ... |
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| Adaptive Backstepping With Magnitude, Rate, and Bandwidth Constraints: Aircraft Longitude Control |
2006 |
8 pages |
| Authors:
Jay Farrell; Marios Polycarpou; Manu Sharma; CALIFORNIA UNIV RIVERSIDE DEPT OF ELECTRICAL ENGINEERING
|
| This article presents an adaptive backstepping approach to the longitudinal (gamma;alpha;Q) control of an aircraft that directly accommodates magnitude, rate, and bandwidth constraints on the aircraft states and the actuator signals. The article includes design of the control law, Lyapunov analysis of the stability properties of the closed loop system, and simulation based analysis of the performance. |
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| GPS Ionospheric Scintillation Measurements Using a Beam Steering Antenna Array for Improved Signal/Noise |
2006 |
6 pages |
| Authors:
Alison Brown; Eric Holm; Keith Groves; NAVSYS CORP COLORADO SPRINGS CO
|
| The ionosphere can affect GPS receivers by degrading the signal strength, in some cases causing loss of carrier lock, and by degrading the accuracy of differential corrections. As we enter the solar maximum years, these effects will become more severe, causing frequent GPS outages in the polar and equatorial regions and over the entire North American landmass when magnetic storms occur. These ionospheric anomalies can potentially have a massive effect ... |
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| Atmospheric and Platform Jitter Effects on Laser Acquisition Patterns (PREPRINT) |
2006 |
9 pages |
| Authors:
Charles W. Hindman; Brian S. Engberg; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| Several applications exist that require the acquisition or a distant target by illuminating it with a laser source, either cooperatively or non-cooperatively. Because of the uncertainties that exist in the knowledge of the target's position as well as the transmitting vehicles attitude, this acquisition process often involves scanning a laser beam over some uncertainty cone. The parameters of this scan can be adjusted to provide an acceptable intensity pattern within ... |
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| Time Delay Estimation |
2006 |
|
| Authors:
Iain Jameson; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
|
 | We investigate the possibility of exploiting the properties of a detected Low Probability of Intercept (LPI) signal wave form to estimate time delay, and by geometry, angle of arrival. We consider the case where a highly correlated signal is received at two stationary passive receivers. The signal source is assumed stationary, and the signal waveform designed sot hat the ambiguity function has a sharp peak. We also restrict ourselves to ... |
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| Pulsed THZ Interrogation of Sofi With Knit Lines in 2D |
2006 |
16 pages |
| Authors:
H. T. Banks; N. L. Gibson; W. P. Winfree; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| This paper examines the scattering effect of knit lines and voids in SOFI through simulations of THz interrogation at normal and non-normal angles of incidence and using focused and non-focused single-cycle plane waves. We model the electromagnetic field using the TE mode of the 2D Maxwell's equations reduced to a wave equation, which are then solved with a finite-element time-domain method. The knit lines are modeled by changing the dielectric ... |
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| Progressive Coding for Hyperspectral Signature Characterization |
2006 |
44 pages |
| Authors:
Chein-I Chang; Jing Wang; Chein-Chi Chang; Chinsu Lin; MARYLAND UNIV BALTIMORE DEPT OF COMPUTER SCIENCE AND ELECTRICAL ENGINEERING
|
| Spectral signature coding is an effective means of characterizing spectral features. This paper develops a rather different encoding concept, called progressive signature coding (PSC) which encodes a signature in a hierarchical manner. More specifically, it progressively encodes a spectral signature in multiple stages, each of these stages captures disjoint spectral information contained in the spectral signature. As a result of such a progressive coding, a spectral profile of progressive changes ... |
|
| JTP: An Energy-conscious Transport Protocol for Wireless Ad Hoc Networks |
2006 |
11 pages |
| Authors:
Niky Riga; Ibrahim Matta; Alberto Medina; Jason Redi; Craig Partridge; BOSTON UNIV MA DEPT OF COMPUTER SCIENCE
|
| Within a recently developed low-power ad hoc network system, we present a transport protocol (JTP) whose goal is to reduce power consumption without trading off delivery requirements of applications. JTP has the following features: it is lightweight whereby end-nodes control in-network actions by encoding delivery requirements in packet headers; JTP enables applications to specify a range of reliability requirements, thus allocating the right energy budget to packets; JTP minimizes feedback ... |
|
| Improving the Performance of Perfectly Matched Layers by Means of hp-Adaptivity |
2006 |
26 pages |
| Authors:
C. Michler; L. Demkowicz; J. Kurtz; D. Pardo; TEXAS UNIV AT AUSTIN DEPT OF MTHEMATICS AND INST OF COMPUTATIONAL ENGINEERING AND SCIENCES
|
| We improve the performance of the Perfectly Matched Layer by using an automatic hp-adaptive discretization. By means of hp-adaptivity, we obtain a sequence of discrete solutions that converges exponentially to the continuum solution. Asymptotically, we thus recover the property of the PML of having a zero reflection coefficient for all angles of incidence and all frequencies on the continuum level. This allows us to minimize the reflections from the discrete ... |
|
| Low-Voltage Ferroelectric Phase Shifters From L- to C-Band |
2006 |
9 pages |
| Authors:
J. S. Kenney; Yong K. Yoon; Minsik Ahn; Mark G. Allen; Zhiyong Zhao; Xiaoyan Wang; Andrew Hunt; Dongsu Kim; GEORGIA INST OF TECH ATLANTA SCHOOL OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This paper describes the design, fabrication and test results of a family of integrated low voltage ferroelectric phase shifters ranging in frequency of operation from 0.7 GHz to 6 GHz. All devices use a common material system of BaxSr1-xTiO3 (BST) thin-films on Al2O3 (sapphire), allowing integration with high-Q inductors and other passive microwave elements. Novel bias structures have also been developed to reduce the voltages required to tune the materials, ... |
|
| Doppler Frequency Shift in Ocean Wave Measurements: Frequency Downshift of a Fixed Spectral Wave Number Component by Advection of Wave Orbital Velocity |
2006 |
5 pages |
| Authors:
Paul Hwang; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Because the Jacobian connecting wave number to frequency conversion is nonlinear, in the presence of background waves even without a mean current a wave number spectral component does not appear at he expected intrinsic frequency in the frequency spectrum measured by a stationary probe. The advection of the wave number component by the orbital current of background waves produces a net downshift in the encounter frequency. Comparison with laboratory measurements ... |
|
| Towards Dualband Megapixel QWIP Focal Plane Arrays |
2006 |
11 pages |
| Authors:
S. D. Gunapala; S. V. Bandara; J. K. Liu; J. M. Mumolo; C. J. Hill; S. B. Rafol; D. Salazar; J. Woolaway; P. D. LeVan; M. .Z. Tidrow; CALIFORNIA INST OF TECHNOLOGY PASADENA JET PROPULSION LAB
|
| Mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) 1024 x 1024 pixel quantum well infrared photodetector (QWIP) focal planes have been demonstrated with excellent imaging performance. The MWIR QWIP detector array has demonstrated a noise equivalent differential temperature of (NE(delta)T) 17 mK at a 95 K operating temperature with f/2.5 optics at 300 K background, and the LWIR detector array has demonstrated a NE(delta)T of 13 mK at a 70 K ... |
|
| Finite Heisenberg-Weyl Groups and Golay Complementary Sequences |
2006 |
9 pages |
| Authors:
S. D. Howard; A. R. Calderbank; W. Moran; PRINCETON UNIV NJ
|
| We provide a new way of understanding Golay pairs "of length N" of sequences in terms of the "2N + 1"-dimensional discrete Heisenberg-Weyl group over the field Z2. Our methodology provides a different insight into the nature of these sequences, as well as a mechanism for designing sequences with desirable correlation properties. Libraries of waveforms formed using these constructions are able to provide collections of ambiguity functions that cover the ... |
|
| High-Frequency Electromagnetic Propagation/Scattering Codes |
31 DEC 2005 |
160 pages |
| Authors:
MONOPOLE RESEARCH THOUSAND OAKS CA
|
| The objective of our effort was to develop computational methods for constructing high-frequency asymptotic solutions in scattering on perfectly conducting objects. The emphasis of the first stage of our work was to describe high frequency phenomena in terms of numerically implemented evolution of wavefronts associated with the propagating waves. The wavefront evolution algorithm is implemented for the leading high frequency mechanisms including: free-space propagation, reflection on smooth surfaces, wave-front splitting ... |
|
| Aero-Optical Wavefront Propagation and Refractive Fluid Interfaces in Large-Reynolds-Number Compressible Turbulent Flows |
31 DEC 2005 |
45 pages |
| Authors:
Haris J. Catrakis; Rhett Jefferies; CALIFORNIA UNIV IRVINE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The physical behavior of refractive fluid interfaces in turbulent compressible separated shear layers and the resulting structure of the aero-optical wavefronts have been investigated using new experimental studies and physical modeling. The experiments utilize the new AFOSR/UCI variable-pressure facility which generates large Reynolds number flows with elevated pressures in the test section crucial for direct imaging of the refractive field and interfaces. Direct, non-intrusive, and non-integrated imaging of the refractive ... |
|
| Excitation of the Magnetospheric Cavity by Space-Based ELF/VLF Transmitters |
30 DEC 2005 |
11 pages |
| Authors:
Timothy F. Bell; STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB (STAR)
|
| During the period of performance, Stanford University completed the development of integral equations describing the distribution of current along a dipole antenna radiating ELF/VLF waves in the magnetospheric cavity. It was found that the radiation resistance was much smaller near the lower-hybrid resonance frequency than previously believed. Stanford University included the effects of ion temperature in the plasma dielectric tensor. It was found that the ion temperature had a first-order ... |
|
| Ultra-Narrow Band Tunable Filter |
20 DEC 2005 |
16 pages |
| Authors:
Balam A. Willemsen; CONDUCTUS INC SANTA BARBARA CA
|
| The goal of this project was to develop the technology necessary to meet the need for a tunable ultra-narrow receiver front-end. We met the challenging major technical milestone of demonstrating that it is possible to tune a high-Q 100 kHz wide filter over a 10% tuning range. Tuning the ultra-narrow filters under this program required a two-generation improvement in tuning technology in both motor and feedback technology. The repeatability of ... |
|
| Micromachined RF Switch With High Mechanical Reliability |
09 DEC 2005 |
19 pages |
| Authors:
Koji Ishikawa; Hiroki Mamiya; Takahiro Miki; Qiang Yu; YOKOHAMA NATIONAL UNIV (JAPAN) DEPT OF MECHANICAL ENGINEERING
|
| For this project, MESA (MEMS Early-Stage Analysis) was implemented to develop ,"tri state multi-contact" switch. The switch was designed and processed to enhance mechanical and RF performance compare to the conventional RF MEMS switches. The switch was successfully fabricated using Metal MUMPs (Thick Metal deposition) process. It demonstrated 107 cycles of switching and 0.5 dB insertion loss. This RF MEMS can be further developed for future advanced RF communications systems ... |
|
| VHF-Band SAR for Detection of Concealed Ground Targets |
01 DEC 2005 |
|
| Authors:
Lars M. Ulander; SWEDISH DEFENCE RESEARCH AGENCY LINKOEPING
|
| Airborne synthetic aperture radar (SAR) operating in the VHF band and used in conjunction with change detection has shown promising results for wide-area surveillance of ground targets. By using VHF-band frequencies, both targets in the open as well as concealed by foliage may be detected in a robust manner. VHF-band SAR is able to detect hidden targets because both foliage attenuation and clutter backscatter is small. The clutter is further ... |
|
| Adaptive Equalization for Burst Signals in Dispersive Channels |
DEC 2005 |
77 pages |
| Authors:
Margaret Riordan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In this thesis a method is developed to estimate and remove group delay caused by the transmission channel in the case of a burst signal. The signal of interest is modeled as burst white noise, and no information about any underlying symbol structure or rate is assumed. The regions of transition between the signal present and the signal not present are used to estimate the group delay of the transmission ... |
|
| A Latching Capacitive RF MEMS Switch in a Thin Film Package (Preprint) |
DEC 2005 |
7 pages |
| Authors:
John L. Ebel; Rebecca Cortez; Kevin D. Leedy; Richard E. Strawser; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| A latching capacitive RF MEMS switch has been successfully designed, fabricated and tested. The switch uses a long thin metal cantilever which is electrostatically held to an upper electrode at the free end and to a lower electrode at the beam root end forming an S-shaped actuator. The upper electrode sits on top of a thin dielectric shell which also serves as part of the package for the device. Slight ... |
|
| The Application of Category Theory and Analysis of Receiver Operating Characteristics to Information Fusion |
DEC 2005 |
109 pages |
| Authors:
Steven N. Thorsen; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Multisensor data fusion is presented in a rigorous mathematical format, with definitions consistent with the desires of the data fusion community. A model of event-state fusion is developed and described. Definitions of fusion rules and fusors are introduced, along with the functor categories of which they are objects. Defining fusors and competing fusion rules involves the use of an objective function of the researcher's choice. One such objective function, a ... |
|
| High Frequency Electromagnetic Propagation/Scattering Codes |
DEC 2005 |
160 pages |
| Authors:
Thomas Jaroszewicz; Elizabeth Bleszynski; Marek Bleszynski; MONOPOLE RESEARCH THOUSAND OAKS CA
|
| The objective of our effort was to develop computational methods for constructing high-frequency asymptotic solutions in scattering on perfectly conducting objects. The emphasis of the first stage of our work was to describe high frequency phenomena in terms of numerically implemented evolution of wave-fronts associated with the propagating waves. The wave-front evolution algorithm is implemented for the leading high frequency mechanisms including: free-space propagation, reflection on smooth surfaces, wave-front splitting ... |
|
| Octave Bandwidth Printed Circuit Phased Array Element |
DEC 2005 |
5 pages |
| Authors:
Paul G. Elliot; Anatoliy E. Rzhanov; MITRE CORP BEDFORD MA
|
| A printed-circuit radiating element for wideband phased array antennas is described which provides a well-matched impedance bandwidth of approximately one octave in the array environment. The main benefit compared to existing octave or more bandwidth array elements (e.g. flared notch, tapered slot or Vivaldi antenna) is that this new element can be etched onto panels that lie parallel to the plane of the array, permitting several rows and columns of ... |
|
| Envelope Switched Doherty Power Amplifier For RF Applications (Preprint) |
DEC 2005 |
|
| Authors:
Jinseong Jeong; Yuanxun E. Wang; MMCOMM INC TORRANCE CA
|
| This report was developed under a SBIR contract. A new concept of envelope switched Doherty amplifier is introduced. The proposed amplifier maintains maximum efficiency over a wide range of output power fluctuation. The essential idea is to drive two amplifier devices connected in Doherty configuration with a pulsed envelope signal. A high-Q, low loss filter is placed at the output to recover for linearity and to generate a time-varying equivalent ... |
|
| Development and Application of the High Bandwidth Powered Resonance Tube |
09 NOV 2005 |
170 pages |
| Authors:
A. Cain; G. Raman; E. Kerschen; C. Nelson; INNOVATIVE TECHNOLOGY APPLICATIONS CO LLC CREVE COEUR MO
|
| The Powered Resonance Tube (PRT) actuator, which is an adaptation of the Hartmann whistle, was selected for bandwidth enhancement. The operation and near field features of this actuator were characterized both experimentally and computationally. An improved analytical theory was developed for the prediction of the frequency of actuation. The analytical frequency prediction formula overcame difficulties with the conventional quarter wavelength theory by accounting for the compliance and mass of the ... |
|
| A Hybrid Approach to the Valuation of RFID/MEMS Technology Applied to Ordnance Inventory |
01 NOV 2005 |
38 pages |
| Authors:
Kenneth H. Doerr; William R. Gates; John E. Mutty; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| The authors report on an analysis of the costs and benefits of the Advanced Technology Ordnance Surveillance (ATOS) program undertaken by the Department of Defense (DoD), initially through its office of Advanced Concept Technology Demonstration (ACTD). The ATOS program involves fielding Radio Frequency Identification/Microelectromechanical System (RFID/MEMS) technology. RFID technology consists of small radio tags that transmit a radio signal identifying the tagged item, often through an electronic product code (EPC, ... |
|
| Radio Frequency (RF) Biomolecules |
NOV 2005 |
|
| Authors:
Joseph Jacobson; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| This report details the results of the MIT RF Biology Program. The RF Biology Program represents an effort to imbue electronic functionality to biomolecules and a means for synthesizing electronically active biomolecules. |
|
| Superconducting MEM Switches for Microwave Power Applications |
NOV 2005 |
16 pages |
| Authors:
Yuri Vlasov; Grover Larkins; FLORIDA INTERNATIONAL UNIV MIAMI
|
| In the fourth year of the project the work on optimization of fabrication process for a capacitively shunted RF micro-electromechanical superconducting switch was continued. Simulations and measurements show that the filter response is not critically distorted by the presence of the MEM switches. When the filter is not active, the signal is attenuated by a value of |
|
| Enhancement of Stochastic Resonance by Tuning System Parameters and Adding Noise Simultaneously |
NOV 2005 |
8 pages |
| Authors:
Xingxing Wu; Zhong-Ping Jiang; Daniel Repperger; POLYTECHNIC UNIV BROOKLYN NY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The stochastic resonance effect can be realized by tuning system parameters or by adding noise. This paper investigates the possibility to enhance the stochastic resonance effect by tuning system parameters and adding noise simultaneously. First, we use some examples to demonstrate the situation where only the system parameters or noise can be adjusted for maximizing the stochastic resonance effect. Then, it is shown using standard optimization theory that the normalized ... |
|
| Enhancement of Stochastic Resonance by Tuning System Parameters and Adding Noise Simultaneously |
NOV 2005 |
8 pages |
| Authors:
Xingxing Wu; Zhong-Ping Jiang; Daniel Repperger; POLYTECHNIC UNIV BROOKLYN NY
|
| The stochastic resonance effect can be realized by tuning system parameters or by adding noise. This paper investigates the possibility to enhance the stochastic resonance effect by tuning system parameters and adding noise simultaneously. First, we use some examples to demonstrate the situation where only the system parameters or noise can be adjusted for maximizing the stochastic resonance effect. Then, it is shown using standard optimization theory that the normalized ... |
|
| Effects of Facial Topography and Eyewear on the 94 GHz Beam |
NOV 2005 |
22 pages |
| Authors:
Donald Hatcher; Donald Marchello; Duane Cox; John D'Andrea; John Ziriax; Leland Johnson; Charles Kuhnel; NAVAL HEALTH RESEARCH CENTER BROOKS CITY-BASE TX BROOKS DETACHMENT
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| Recently, a millimeter wave (MMW) hardware system, called Active Denial System (ADS) has been developed for use as a non-lethal weapon system. The ADS system is capable of generating high power MMWs and is to be used for, but not limited to, crowd management and denying access to restricted areas. ADS achieves this end by using a 94 GHz MMW beam to produce rapid skin heating to a temperature that ... |
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Radiofrequency Wave Propagation
