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December 2008 UWB Antenna Assists Ground-Penetrating Radar Landmines are buried and forgotten, so often that an estimated total of 110 million landmines are buried in over 60 countries around the world. Statistics show that hidden and forgotten landmines kill or injure approximately 70 people each day, resulting in over 25,000 deaths or injuries per year. Unfortunately, there is little international effort to detect and clear the landmines due to shortage of funding. Before they can be removed, they must be located... — Boon-Kuan Chung , et al. November 2008 Antenna Tuning Approach Aids Cellular Handsets Shrinking wireless and mobile electronic devices are impacting antenna design and performance. Portable device designers must work with miniature antennas covering 824 to 2170 MHz or more, different modulation schemes, and high data rates. With shrinking handsets, the area for the antenna is limited, often with the antenna wrapped around peripheral functions in the handset. Such a solution often makes the antenna more susceptible to detuning by... — Rodd Novak , et al. November 2008 Mobile WiMAX Is Vetted For Video Like every new wireless standard, mobile WiMAX has experienced some controversy. People in the wirelesscommunications industry have alternately doubted its viability and exaggerated its merits. With last month’s launch of the XOHM mobile fourth-generation (4G) service in Baltimore, MD, however, mobile WiMAX has shown that it will likely have a spot alongside 4G telecommunication standards like Long Term Evolution or LTE (... — Nancy Friedrich November 2008 Verizon And Nokia Siemens Networks Set Record For 100-Gb/s Optical Transmission BASKING RIDGE, NJ—Verizon and Nokia Siemens Networks have taken a step closer to being able to transmit commercial traffic at a speed of 100 Gb/s. The two companies carried out a successful 100-Gb/s transmission on a single wavelength for more than 1040 km over field fiber. In doing so, they set a new distance record while demonstrating better performance than conventional transmission. The field trial was conducted on optical fiber on the Verizon network... — Dawn Hightower November 2008 Transceiver SoC Satisifes ZigBee Applications Like other wireless-communications specifications, ZigBee is driving increasingly higher levels of integration. A recent example is a line of ZigBee transceiver integrated circuits (ICs) that combines a ZigBee-compliant RF transceiver with an 8051-based, 8-b microprocessor. Known as the ZIC2410 series, these systems-on-a-chip (SoCs) have a transmit/receive frequency range of 2.400 to 2.4835 GHz. They deliver +8 dBm output power. Receiver sensitivity is –98 dBm. The... — Nancy Friedrich October 2008 Tune In Clearly On Antenna Fundamentals Radio-fRequency (Rf) engineeRs often cite designing RF emitters, such as RF/microwave antennas, as major technical challenges. This issue seems to stem from a lack of clear understanding of RF transmitting antennas. To alleviate this problem, Instruments For Industry (IFI) has released “Application Note 105: RF Antennas and Related Formulas.” This note explains some of the more standard antenna terms. It also delves into the basic math that is required to calculate... — Nancy Friedrich October 2008 AWG Handles WiMedia Signal Generation ULTRAWIDEBAND (UWB) communications techniques serve as examples of how RF signals and systems are becoming increasingly complex. Clearly, RF engineers need better ways of understanding RF signal behavior and multiplesignal interactions. In “UWB-WiMedia Signal Generation Using Advanced Waveform Editing Tools,” Tektronix, Inc. delves into the challenges involved in generating frequency-hopping UWB signals. The 15-page application note also details the options that... — Nancy Friedrich October 2008 Skyworks/Ember To Develop Portfolio Of Front-End Modules For ZigBee Applications ATLANTA, GA—Skyworks Solutions, Inc. and Ember are partnering to develop the industry’s first portfolio of ZigBee front-end modules (FEMs) targeting applications like smart meters in energy management, home-area networks (HANs), and industrial automation. ZigBee is a wireless-networking standard that solves the unique needs of remote monitoring, control, and sensor-network applications. The modules’ receive paths integrate baluns in order to provide... — Dawn Hightower October 2008 First Wideband Networking Radio Certified As Fully Compliant ROCHESTER, NY—Harris Corp. has announced that its Falcon III AN/PRC-117G(V)1(C) multiband manpack has become the first wideband networking radio to be certified as Software Communications Architecture (SCA) compliant. The certification, from the Joint Program Executive Office (JPEO) for the Joint Tactical Radio System (JTRS) program, ensures that the radio is easily upgradable to JTRS wideband and narrowband waveforms. Harris is the only company to receive JTRS SCA... — Dawn Hightower October 2008 Communications Technologies Strive For Improved Connections Communications systems operators face at least one continuing reality: their customers want ever-improving services even as networks become overloaded with subscribers. Additional subscribers on a wired or wireless communications network benefit the business side of the operation. But as more subscribers are added to a network, its capacity is pushed to its limits, requiring the assistance of advanced technologies, in the form of hardware and software,... — Jack Browne October 2008 Analyze Interference In Compact Wireless Designs Portable wireless transceivers have proliferated rapidly in recent years, for a wide range of applications including transmission and reception of voice, data, and video. One of the key requirements for wireless equipment is that the electronic circuits operate in the vicinity of other high-frequency radio transmitters, such as Bluetooth devices. Previous studies on interference have considered any source as a far-field effect and focused on... — Don LaFontaine September 2008 WiMAX Forum Applauds India’s Auction Of Frequencies For WiMAX Technology PORTLAND, OR —The WiMAX Forum (www.wimaxforum.org) commended the Department of Telecommunications of India for the allocation and upcoming auction relating to the 2.3- and 2.5-GHz frequency bands. The availability of these key bands for WiMAX technology in India will provide its consumers with much needed broadband connectivity across the diverse economic and social needs of the population. The auction will ... — Jack Browne September 2008 CSR Awards BRTF Status By Bluetooth SIG Cambridge, UK—CSR (www.csr.com) has achieved recognition by the Bluetooth Special Interest Group (SIG) as a Bluetooth Recognized Test Facility (BRTF). CSR’s test facilities are now regarded as having developed to the point where it can entirely test its own firmware, rather than using an external testing house. BRTF status means that CSR can help customers get their products to market faster, thereby reinforcing CSR’s... — Jack Browne September 9, 2008 WiFi-Based Positioning System Finds People In Emergencies — Lisa Maliniak August 2008 Millimeter-Wave Bands Support Diverse Uses Millimeter-wave frequencies are difficult to generate and as difficult to test, but the bands above 30 GHz have long intrigued commercial and military spectrum planners because of their amount of available bandwidth. So named because of having wavelengths in the 1 to 10 mm range, frequencies from 30 to 300 GHz have long been used in military and government applications, but only recently been ... — Jack Browne August 7, 2008 Freescale And Arada Systems Collaborate On 802.11n Access Point Devices Taiwanese provider of wireless test-system solutions, LitePoint Corporation, has developed three new systems for testing wireless standards. The new IQnxn Plus system provides a multi-stream signal capability — Paul Whytock July 2008 Startup Proposes Wi-Fi For Personal Area Networks Materials suppliers are constantly refining their recipes in search of products that offer greater value and increased reliability for a variety of commercial, industrial, and military applications Jack Browne Technical Director Microwave materials represent building blocks for high-frequency circuits and systems. Whether they are used to hold circuit traces, absorb or suppress radiofrequency interference (RFI), or form resonant... — Jack Browne July 2008 Examine The Effects Of Phase Noise On RFID Range Radio-frequency-identification (RFID) systems have become widespread as reliable means of storing and remotely retrieving data through the use of compact RFID tags. In particular, the use of ultrahigh- frequency (UHF) passive RFID is appealing for many applications since it enables recognition from a reasonable distance. The technology is ideal for supply-chain management and several major firms, such as Wal-Mart and Tesco, are planning to mandate... — Dr. Byung-Jun Jang , et al. July 2008 Design An X-Band Vivaldi Antenna Antennas are essential to highfrequency communications and electronic systems for radiating or receiving electromagnetic (EM) energy. Although there are many types of antennas, they all operate according to the same basic EM principles. The basic behavior of an antenna can be described by its wave field strength, polarization, and direction of propagation.1 Key requirements in applications such as airborne radar and communications systems... — Dr. J.S. Mandeep , et al. July 2008 SiGe GPS Receiver Handles Two Antennas Global Positioning System (GPS) receivers are being embedded into almost any bit of electronic gear that moves, from the electronic circuits in automobiles to cellular telephones and Personal Digital Assistants (PDAs). To support this “global” expansion, SiGe Semiconductor has developed its model SE4150L GPS radio receiver for next-generation embedded GPS applications. The tiny receiver targets the three main requirements of these emerging... — Jack Browne  prev. page
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