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January 2012 Approach Cuts Costs Of Performing Radar Simulations Radar systems and radar-cross-section (RCS) measurements were once associated only with military applications. — January 2012 Probes Promise Precise On-Wafer Measurements At THz Frequencies Terahertz-frequency integrated circuits (ICs) offer tremendous promise in terms of available bandwidth for short-range communications. — January 2012 Indium Phosphide Technology Yields Sources To 0.57 THz Emerging millimeter-wave applications require the development of suitable low-noise oscillators for use as local oscillators (LOs) in receivers. — December 2011 Terahertz Radar “Maps” Targets In Long-Distance Pat-Down Due to concerns over privacy, efficiency, and accuracy, security screening at airports and other public places is constantly being improved. — December 2011 Vacuum Electronics Serve As Terahertz Power Source Capabilities have greatly advanced for vacuum-electronic-device (VED) sources of terahertz and near-terahertz coherent radiation—both continuous wave (CW) and pulsed sources. — December 2011 Three-Terminal Transistors Enable Amplifiers And More At 670 GHz Over the last few years, the development of transistor technologies with maximum frequency of oscillation, fMAX, beyond 1 THz has driven amplifier operating frequencies into the sub-millimeter-wave range. — November 2011 Energy Harvester Targets RF-Powered Sensor Networks In RF energy harvesting, network architectures employ a hub as both a radiating source and data collector. — November 2011 Particle Swarm Optimization Shapes Antenna Arrays Due to their very complicated coupling environment, the design of miniaturized phased-array antenna systems is very challenging. — November 2011 Dielectric Horns Give Roots To Terahertz Antenna Thanks to growing interest in spectroscopy, imaging, and other applications, the terahertz (THz) band has been expanding. — October 2011 Patch Array And LNA Form 60-GHz Receiving Antenna ANTENNAS ARE EVOLVING from conventional discrete structures to antenna-in-package (AiP) solutions. In a novel approach, a circularly polarized antenna was recently integrated with active circuits at 60 GHz in the package by Mei Sun, Muhammad Faeyz Karim, and Ong Ling Chuen from Singapore’s Institute for Infocomm Research together with Ya-Qiong Zhang, Yong-Xin Guo, and Mook Seng Leong from the National University of Singapore. This active receiving antenna array was designed... — October 2011 Reconfigurable Reflectarray Antenna Boasts 25,600 Elements Generally, radar and imaging systems call for antennas with large apertures and fast beam-scanning capabilities. — October 2011 Polar Transmitter Incorporates 2.4-GHz PA SWITCHING POWER amplifiers (PAs) boast higher efficiency compared to linear PAs. Yet they cannot be directly applied in systems employing spectrally efficient modulation. One solution proposed to “break” this tradeoff is polar modulation. At the University of California, a 2.4-GHz mixed-signal, polar-modulated PA in 65-nm CMOS has been demonstrated by Debopriyo Chowdhury, Lu Ye, Elad Alon, and Ali M. Niknejad. Their digitally modulated ... — September 2011 Small-Signal Polar Transmitters Prove Cellular Worth To enable low-cost and low-power radios for cellular phones, both optimal RF transceiver architectures and innovative circuits are needed. — September 2011 Cognitive Radio Relies On Reconfigurable Rotating Antennas TO FIND GAPS in the finite frequency spectrum and then alter its characteristics to operate within those bands, a cognitive-radio system requires a transmit/receive antenna that can monitor broad bandwidths and be reconfi gured as necessary. An ultra-wideband (UWB) sensing antenna continuously monitors the wireless channel in its search for unused carrier frequencies. In contrast, a reconfigurable transmit/receive antenna provides... — September 2011 UWB-IR Transceiver Front End Spans 7.25 To 8.50 GHz FOR WIRELESS sensor networks, ultra-wideband impulse radio (UWB-IR) is increasingly being adopted for its low power consumption and high data rates. Rather simple transceiver architectures make UWB-IR a very low-energy solution. Yet such simplicity often implies low transmitter efficiency coupled with high sensitivity of non-coherent receivers to in-band interferers. Recently, an approach was proposed in which the transmitter would generate pulses... — August 2011 Antenna On Thin Substrate Serves Ultra Wideband SQUARE AND circular monopole antennas for ultra-wideband (UWB) applications are known for providing a relatively small impedance bandwidth. Numerous techniques have been proposed to improve the matching over a broad bandwidth. One alternative introduces radiator-width and feed-position control. The resulting printed monopole antenna, which measures just 30 x 36 x 0.4 mm, provides a -10-dB impedance bandwidth from 2.82 to 13.60 GHz. This antenna ... — August 2011 Compact Vivaldi Antenna Targets UWB Applications A HYBRID RF PHOTONICS system, which utilizes optical links and an RF transducer at the antenna, may reportedly provide data transmission with a bandwidth beyond 100 GHz. Many are therefore eying an ultra-wideband (UWB) antenna array as a target application. Such an array requires an RF aperture or antenna to be integrated with an opto-electronic circuit in both a simple and compact manner. At the University of Delaware, Jian Bai, Shouyuan Shi, and Dennis W.... — August 2011 Inductor-Less LNA Promises To Cut Noise TODAY’S WIRELESS industry requires the ongoing development of multiband/multi-standard terminals for low-cost and multifunction transceivers. The current trend—using single wideband front ends—accommodates all of the diverse wireless standards while reducing chip area. Yet these single front ends must consume little power, provide high linearity, and keep noise down, making the performance of their lownoise amplifiers (LNAs) key. An LNA... — July 2011 IR-UWB Transmitter Could Support Gigabit Rates THE FLURRY OF development around ultra-wideband (UWB) opportunities has led to the creation of many types of transmitter designs. Recently, for example, a 5-kV electrostatic-discharge (ESD)-protected impulse-radio (IR) UWB transmitter was implemented in 0.18-µm CMOS. It employs a fifth-order Gaussian pulse generator and binary-phase-shift-keying (BPSK) modulation for large information capacity over the UWB frequency range of 3.1 to 10.6 GHz. A... — July 2011 Mobile-Phone Antenna Passes Hearing-Aid Tests ACCORDING TO THE ANSI C63.19-2007 hearing-aid-compatibility (HAC) specification, at least half of all mobile phones on the US market must have an RF interference level of category “M3” or “M4.” Techniques have been demonstrated that decrease the near-field emission of embedded antennas. Yet the industry still lacks potential designs for a bar-type mobile phone with an embedded antenna that... —  prev. page
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