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ISSUE DATE: JANUARY 2003 | |
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January 2003 - In This Issue [Cover Story] Coaxial Tuners Control Impedances To 65 GHz Device characterization at precisely controlled source and load impedances provides insights into the nonlinear behavior of both low-noise and power transistors. For transistors used in wireless amplifiers, this capability can reveal the impedance... — Jack Browne [News] Wireless Show Spotlights Wireless Networking Wireless design activity has never been at a higher level, at least according to engineers working on wireless-local-area-network (WLAN) and Bluetooth product solutions. While cellular design activity is now starting to accelerate, due to the... — Jack Browne [News] ARMMS Meeting Tackles Measurement Issues Power measurements require care and precision. Some of the leading engineers involved with power measurements discussed their strategies at the most recent ARMMS RF and Microwave Society Meeting, held October 28-29, 2002 in the Tortworth Hotel... — Jack Browne [Design Features] Performing Bluetooth RF Radio Testing Bluetooth radio designs employ a number of system architectures, from conventional intermediate-frequency (IF)-based systems with analog modulation to digital in-phase/quadrature (I/Q) modulator/demodulator configurations. Currently, various forms... — Peter Cain [Design Features] Check Bluetooth Baseband Signals With A Scope Oscilloscopes are not commonly associated with Bluetooth measurements. But a digital scope's long memory records and multiple screen views make it an ideal tool for analyzing the packetized bursts that comprise Bluetooth baseband data. Key... — Tom Cargill , et al. [Design Features] Achieving Antenna Isolation Within Wireless Systems Antennas embedded within compact devices, such as handheld computers and cellular telephones, must be optimized to limit interactions with surroundings. Such antenna isolation permits good efficiency within different enclosures and reduces the... — Dr. Laurent Desclos , et al. [Design Features] Oscillators: A New Look At An Old Model Oscillator designers have relied on certain assumptions based on modulation theory. But by abandoning traditional beliefs, it is possible to formulate new models for analyzing oscillators. In Part 1 of this article last month, some of these... — Stan Alechno [Design Features] Design A High-Precision Antenna For GPS Global Positioning System (GPS) receivers (Rxs) are becoming ubiquitous, as part of the electronics packages of new automobiles, in cellular telephones, and in compact electronic devices. Unfortunately, multipath errors continue to plaque the... — Giandomenica Amendola , et al. [Product Technology] Top Products Of 2002 Technology advances even during difficult years, as evidenced by an impressive collection of new products making up the Top Products of 2002. Selected by the editors of Microwaves & RF, the top 13 products of 2002 (... — Jack Browne [Product Technology] Tiny Quad Hybrid Spans 2 To 18 GHz Reduced component size and weight pay tremendous dividends in systems requiring hundreds or thousands of components, such as phased-array radars. The QHD-3C-10G quadrature hybrid coupler from Merrimac Industries (West Caldwell, NJ) is an example of... — Rocco Delillo [Product Technology] System Automates GSM/WCDMA Location-Capable Mobile Testing Position-location capabilities are being installed in both code-division-multiple-access (CDMA) and Global System for Mobile Communications (GSM) networks. In the US, these capabilities are mandated by such policies as the Federal Communications... — Jack Browne [Product Technology] Delay-By-Events Trigger Aids Pulsed Signal Analysis Measuring the peak and average power, rise and fall times, pulse widths, and delays of pulsed signals in ultrawideband (UWB), radar, remote sensing, digital wireless, and optical systems requires a peak power meter capable of synchronizing to a... — Richard Theiss [Editorial] Looking For The Next Best Thing Surveying the high-frequency industry from an editor's chair has its occasional benefits, including a unique, noncompetitive view of products and technologies that few can match. Often it is one of the first looks at sometime outside of the... — Jack Browne |
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