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November 2011 Standards Expand For Enhanced Performance — Jack Browne 50th Anniversary Issue Standardized Approach Feeds Wireless Power At the turn of the 20th Century, Nikola Tesla contributed much in the fields of alternating current (AC) and electromagnetism. — October 2011 Designing For Outer Space Space-based systems such as satellites require extremely reliable components. — Jack Browne August 2011 Sidebands Are Not Necessary Traditional communications systems rely on sidebands as the means of transmitting modulated signals. But this is not necessarily true for ultranarrowband (UNB) modulation methods. In fact, it can be shown by means of amplitude-modulated (AM) pulse testing that the sidebands are not essential for transmission or reception of AM pulse-modulated signals. In pulsed radar systems, sidebands at the transmitter are necessary because available filters cannot remove them. But ... — Harold R. Walker June 2011 Eyeing EMI/EMC In RF Designs Designers working with electromagnetic (EM) energy are constantly faced with the threat of leaks—that stray EM energy could make its way into the parts of a circuit or system where it can do more harm than good. When this happens, the EM energy takes on the form of electromagnetic interference (EMI). It can disrupt the performance not only of the circuit or system it originates from, but of circuits and systems nearby. Fortunately, there are numerous... — Jack Browne March 2011 Amplifier System Powers Whole-Body MRI Scans MAGNETIC RESONANCE IMAGING (MRI) is one of the best-known examples of RF technology applied to medicine. MRI scanning and imaging systems can provide early detection of cancerous tumors and arm medical personnel with knowledge to make differences in patients’ lives. MRI systems have made great strides in recent years, to the point where sensitive full-body scans can now be performed within a reasonable time frame; much of the credit for this is due to advances in... — Daniel P. Myer February 2011 Extend Active RFID With A ZigBee Network ZigBee and radio frequency identification (RFID) are two wireless technologies that have each developed hosts of applications independent of each other. Each has benefits, with ZigBee supporting advanced sensor networks and RFID suitable for low-power wireless tracking of people and objects. By combining the two technologies, it is possible to create a ZigBee mesh network with integrated active RFID tracking capability— one in which RFID tags within the network can... — November 2010 Plug-And-Play Modules Span 433 To 2483 MHz FOR ELECTRONIC ENGINEERS who lack RF expertise but are challenged with adding lowpower wireless capability to new or existing devices, the Anaren Integrated Radio (AIR) modules vow to provide a plug-and-play solution. By leveraging Texas Instruments’ semiconductor technology, the AIR module family promises to deliver easy integration and implementation on an existing or newly designed two-layer printed-circuit board (PCB). The A1101R04C, which spans 433.0 to 434.4 MHz, is an... — Nancy Friedrich June/July 2010 Defense Electronics Supplement OpenVPX Speeds Time To Market VME is one of the oldest commercial off-the-shelf (COTS) buses still being designed into new military systems. At one time, it offered the industry’s fastest backplane bus. Its 320-MB/s speed was impressive when the format was first introduced in 1997. But today, the parallel VME bus has been superceded by high-speed serial interfaces like Serial RapidIO and Gigabit Ethernet. For military systems designers, high-speed bus options are many, but the... — Bill Wong June 2010 Smart-Energy Module Puts Out +20 dBm A NEW TOOL CALLED iFILTER was developed specifically for the synthesis of lumped-element and distributed filters. It operates within the Microwave Office high-frequency design software, thereby allowing filter designs and their evolution to be part of the entire circuit design project. With iFilter’s intuitive user interface, designers should be able to quickly and easily design filters, connect them to other circuitry, and make optimization tradeoffs. iFilter’s ... — Nancy Friedrich February 2010 Smart-Card Market Players Join Forces To Advance Applications LONDON, UK —Together with chip suppliers Infineon Technologies AG and INSIDE Contactless S.A., smart-card manufacturers Giesecke & Devrient GmbH (G&D) and Oberthur Technologies S.A. have launched an industry initiative to provide a security solution for next-generation, smart-card-based public-transport applications. The solution will build on an open standard that is being implemented by the four partner companies. Eventually, that standard will be... — Dawn Hightower October 2009 Multimode Transceiver Eliminates SAW Filters Wireless device designers seek increased functionality but without added size, especially when supporting handset designs with multimode, multiple-band capabilities. Fujitsu Microelectronics America has responded to the needs of these designers with the functionpacked model MB86L01A multimode third-generation (3G) cellular radio transceiver, which is fabricated without 3G transmit and receive interstage surface-acoustic-wave (SAW) filters and ... — Jack Browne November 2008 RF Subsystem Supports Variety Of Cellular Femtocells A FULLY INTEGRATED RF SUBSYSTEM has been created for GSM, GPRS, and EDGE femtocell base stations and cellular repeaters. By combining analog and mixed-signal semiconductors on a compact assembly, the subsystem can be used in femtocell base station and cellular repeaters in the GSM850, EGSM900, DCS1800, and PCS1900 frequency bands. The dual-chip RF subsystem solution consists of the SKY74219-21 RF transceiver with analog in-phase/quadrature (I/Q) interface for... — Nancy Friedrich October 2008 PMC Format Holds Agile ADCs And SDRs Modular signal-processing solutions provide a great deal of exibility in both military and industrial applications. By swapping modules or cards in a mainframe, the character of a system can be quickly changed, and performance capabilities rapidly modi fied to suit an application. A number of standards have been established to improve the compatibility of signal-processing modules, including the Peripheral Component Interconnect (PCI) standard and the PCI... — Jack Browne September 2008 Setting Strategies for Transmission Lines Transmission lines are often taken for granted in the design of high-frequency circuits and integrated circuits (ICs), since the focus is often on getting signals into and from an active device. But by understanding the capabilities of different microwave/RF transmission lines and how to optimize them, design iterations, time, and unnecessary cost can be saved from a project. Part 1 of this two-part article will show how a careful design process should... — Leo G. Maloratsky May 2008 Modular Approach Provides Fast And Easy Prototyping Prototype development of RF and microwave designs can be tedious, requiring weeks or even months of engineering and construction time. For those who seek a faster, easier approach to the prototyping of new RF and microwave designs, however, MicroWaveCells (www.microwavecells.com) offers a new and innovative approach to building high-frequency circuit functions, subsystems, and complete systems in hours and days,... — Jenny Jiayan Shen May 2008 7/16 Panel Receptacle Exhibits –175 dBc IMD Performance LOW INTERMODULATION distortion (IMD) is key to newer wireless systems like WiMAX. Such systems rely on outstanding linearity in both amplifiers and passive components to process the complex modulation schemes needed data rates. By consistently delivering passive-intermodulation (PIM) levels of –175 dBc, a 7/16 panel receptacle is promising to meet this need for connectors. This receptacle exhibits a voltage standing wave ratio (VSWR) of less... — Nancy Friedrich March Broadband Instrumentation Amplifier Delivers 40 To 535 W At the heart of most applications is a high-performing amplifier. The MT4100 broadband continuous-wave (CW) amplifier, for example, targets radar, EMC, EW testing, and other wideband applications. Its typical output power ranges from 40 to 535 W. The amplifier is available in models covering 2 to 8 GHz, 6 to 18 GHz, 18 to 27 GHz, and 26.5 to 40 GHz. By leveraging a modular design, this compact TWTA promises to provide extensive diagnostic capability, advanced... — Nancy Friedrich October 2007 Checking Communications Systems Interoperability Communications systems provide reliable performance only after they have been tested under a wide range of operating conditions. Wirelesscommunications systems, for example, must be evaluated for the effects of such factors as path loss, immunity to interference, multipath reflections, and atmospheric losses. Real-world testing at the site of a communications system will yield the best overall information about the system, but this is not practical in most... — Warren K. Gruber October 2007 Supplier Transforms Switches Into Higher-Level Assemblies Maximizing engineering resources is of utmost importance to most military-electronics contractors, to the point where many of the largest suppliers have turned to traditional RF/microwave component houses in search of subassembly integration. One of the long-running RF/microwave component suppliers that has learned how to blend its component business with its expanding subsystem integration skills is Daico Industries (... — Jack Browne  prev. page
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