Research & Development
 86 results found for Research & Development, displaying items 1 - 20

March 2010
NASA Breaks Ground For Deep-Space Network Antennas
WASHINGTON—NASA officials broke ground near Canberra, Australia to begin a new antenna-building campaign to improve Deep Space Network communications. Following the recommendations of an independent study, NASA embarked on an ambitious project to replace its aging collection of 230-ft.-wide dishes with a new 112-ft. antenna by 2025. The three 70-m antennas are more than 40 years old and located at the NASA Deep Space Network complexes at Goldstone, CA, Madrid, Spain, and...  — Dawn Hightower

March 2010
Algorithm Nails Sweep Calculations Of EM Wave Scatterings
WHEN EVALUATING PROBLEMS like the radar cross section (RCS) of an object, the system response must often be calculated at multiple frequencies. If traditional frequency-domain numerical methods are used to accomplish this task, a dense matrix equation must be solved at each frequency. Several approaches can alleviate this time-consuming computational burden. To further speed processing, a model-order reduction algorithm for the volume ...  — Nancy Friedrich

January 27, 2010
Integration Creates Compact CDMA RF Front End with GPS Capability
In this whitepaper, design requirements, best practice PCB layout, component selection and system design will be addressed.  — Staff

January 27, 2010
Fiber Optic Transceivers in Basestation Applications
Base station transceivers with greater bandwidth are in demand. Fiber optic links give cost effective, high bandwidth new capacity with more flexibility than copper links. Fiber links make system modifications and future upgrades simpler than would be possible with traditional copper links. In addition, fiber features inherent data security and superior reliability in hostile environments.  — Staff

January 27, 2010
GaAs-Based Surface Mount Wafer Scale Package MMICs for DC to 45 GHz Applications
Packaging has always been the "Achilles Heal" of extracting the maximum microwave performance out of any IC technology.  — Staff

January 2010
Modulation Approach Uses Arrays With Driven Elements
IN CONVENTIONAL PHASED-ARRAY TRANSMISSION, information is transmitted in undesired directions through sidelobes. To provide more secure communications, some research has delved into time modulation in arrays. While conventional arrays have static-element phase shifts and weighting, time-modulated arrays exploit an additional degree of freedom—time—in order to raise performance. At the University of Illinois at Urbana-Champaign, Michael P. Daly and Jennifer...  — Nancy Friedrich

December 2009
Glasgow Scientists Guide Future Nano-Chip Design
GLASGOW, SCOTLAND—In collaboration with colleagues from Edinburgh, Manchester, Southampton, and York universities, scientists at the University of Glasgow have developed technology to help microchip designers create future integrated circuits (ICs). Essentially, the scientists have developed simulation tools that take advantage of grid computing to predict how billions of nano-transistors—each with their own unique and unpredictable atomicscale ...  — Dawn Hightower

December 2009
Determine Radiation Effects For Ingestible Wireless Devices
To assess the compliance of an ingested wireless device (IWD) with related international safety guidelines, a team of researchers used the finitedifference- time-domain (FDTD) method for two realistic body models in an electromagnetic (EM) simulator. Both biological effects and the IWD’s signal intensity were studied by Lisheng Xu from China’s Northeastern University together with Max Q.H. Meng, Hongliang Ren, and Yawen Chan from the Chinese University of Hong...  — Nancy Friedrich

October 2009
On-Body Radio Channel Is Modeled At 900 MHz
A GROWING VARIETY OF BODY PARAMETERS are monitored by mobile, compact, intercommunicating sensors that make up wireless bodyarea networks (WBANs). To design efficient WBANs, engineers must know the radiation and propagation in close proximity of human bodies. Recently, the Finite Difference Time Domain (FDTD) technique was used to perform on-body radio channel modeling at 900 MHz by Hanae Terchoune, Azeddine Gati, Albert Cortel Carrasco, Man Faï Wong, and Joe...  — Nancy Friedrich

August 2009
Antenna Enables Communication Over Body Surface
CURRENTLY, A LOT of effort is being devoted to the integration of RF transceiver modules with embedded signal processing and sensor circuitry for small, low-power wireless nodes—mostly at 2.45 GHz and below. The antenna presents a significant problem in such miniaturized systems, as the smaller size demands tradeoffs between design parameters like efficiency, bandwidth, and radiation characteristics. In addition, antenna performance is affected by close...  — Nancy Friedrich

June 2009
Microwaves Detect Malaria At Its Onset
MALARIA CLAIMS THE LIVES of an estimated one to three million people every year. No vaccine is available for this infectious disease. With early diagnosis, however, patients have a better chance of responding to drug treatments. A method of detecting malaria at its onset has been developed by Anil Lonappan, Vinu Thomas, Joe Jacob, and K.T. Mathew from India’s Cochin University of Science and Technology with C. Rajasekaran from the Medical College...  — Nancy Friedrich

May 2009
Colorado State University Beams Weather Radar Data
GREELEY, CO—The Colorado State University CHILL (CSU-CHILL) National Weather Radar Facility has deployed Exalt Communications’ EX-2.4i microwave radio system to reliably deliver real-time weather radar data from its remote location to researchers on the CSU campus. The system allows campus researchers to monitor live weather events. It also eliminates the need to manually transfer data on storage disks between the remote site and the campus. “Our researchers...  — Dawn Hightower

May 2009
Jumping Genes Tackle UWB-Antenna Design Requirements
Wideband-antenna design can be quite formidable— especially for the handheld terminal, as compromises must be made for frequency band, size, pattern, gain, and simplicity. Recently, a planar UWB monopole antenna was proposed by the City University of Hong Kong’s Xue-Song Yang, Kai Tat Ng, Sai Ho Yeung, and Kim Fung Man. This antenna was designed using a newly developed evolutionary optimization algorithm. One recently proposed multi-objective optimization ...  — Nancy Friedrich

May 2009
Generate Ultrashort Pulses At 50 Attoseconds And Beyond
Researchers are increasingly leveraging ultrashort light pulses in areas as diverse as high smallscale lithography and high-speed switching and communications. In fact, a simple system for attosecond pulse generation using optic devices known as multistage microring resonators has been proposed by P.P. Yupapin and S. Chaiyasoonthorn from King Mongkut’s Institute of Technology (Ladkrabang, Bangkok) and N. Pornsuwancharoen from both King Mongkut’s and Rajamangala...  — Nancy Friedrich

May 2009
Decoupling Network Raises Antenna Port Isolation
Through the use of multi-element antennas, wireless systems are accommodating increasingly higher data rates. At National Chiao Tung University (Hsinchu, Taiwan), a compact decoupling network for enhancing the port isolation between two closely spaced antennas has been investigated by Shin-Chang Chen, Yu-Shin Wang, and Shyh-Jong Chung. Using the proposed decoupling structure, two examples of printed antennas at 2.45 GHz were created. Isolation between the...  — Nancy Friedrich

January 2009
Portable Breast-Cancer Screening Device For Use In Remote Clinics
AMHERST, MA—Anatoliy Boryssenko, an Associate Professor of Electrical and Computer Engineering and a Researcher at the University of Massachusetts Amherst, is building a portable breastcancer screening-device alternative that uses low-power microwaves. This device could bring modern breast-cancer screening to third-world countries without the danger, expense, and access problems of X-ray-based machines. It also could be useful as a second opinion to...  — Dawn Hightower

January 2009
Antennas Prove Feasibility Of Future Space Arrays
FOR SPACE-TO-GROUND VOICE, data, and telemetry, both the Space Shuttle and future Crew Exploration Module rely on the constellation of geosynchronous satellites dubbed the Tracking and Data Relay Satellite System (TDRSS). At the heart of the TDRSS satellite architecture is a multiple-access, S-band phased-array antenna. Recently, prototype antenna elements have been produced for the next-generation Tracking and Data Relay Satellite Continuation (TDRS-C) ...  — Nancy Friedrich

January 2009
VLF Propagation In Earth-Ionosphere Waveguide Pinpoints Lightning
USING ONLY 30 LIGHTING SENSORS, worldwide lightning location (WWLL) has been successfully achieved via very-low-frequency (VLF) propagation in the Earth-ionosphere-waveguide (EIWG) atmospheric layer. To avoid ground propagation or mixed “sky” and ground propagation, the researchers demanded evidence of Earth-ionosphere waveguide dispersion. In addition, each lightning strike had to be within the perimeter defined by the lightning-sensor sites that were detecting...  — Nancy Friedrich

December 2008
Reflectarray Cells Operate Beyond 100 GHz
RECENTLY, IT WAS PROVEN that the phase of signals in the microwave and millimeter-wave bands can be modulated by exploiting the physical response of liquid-crystal molecules to an applied electric field. Several prototype devices have emerged that are based on liquid-crystal substrates with tunable permittivity. For example, prototype reflectarray structures that operate at frequencies above 100 GHz have been designed by Wenfei Hu, Robert Cahill,...  — Nancy Friedrich

November 2008
Body-Area Network Monitors Emotional Reactions
LEUVEN, BELGIUM—A new research concept uses a combination of body parameters to monitor a person’s arousal level. IMEC has developed an ambulatory arousal monitor in a compact form factor with a long battery lifetime. It consumes less power than a comparable Bluetooth device. In fact, the entire system allows several days of autonomy on a commercial prismatic Li-Ion battery. IMEC’s approach within its Human++ program at Holst Centre uses a body-area network...  — Dawn Hightower





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