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Microstrip Resonant Phase Shifters Matjaz Vidmar University of Ljubljana Slovenia There are several possible designs for adjustable phase shifters (or adjustable delay lines) depending on the operating frequency, required bandwidth, power handling and technology used (mechanical, ferrite, PIN diode, varactor or I/Q modulator). This article describes the particular problem...

Technical Feature Increased Accuracy of Absolute Group Delay Measurements My Le Truong Please click here to view the pdf file of the Technical Feature...

3G is Poised to Take Over the Cellular World After much hoopla, third-generation (3G) hardware and software are finally preparing to become a reality at a global scale. Unresolved design and protocol questions are rapidly being addressed — but does anyone want a hand-held unit for the Internet? Ernest...

Publish or Perish: It’s Not Just for Academics Anymore Harlan Howe, Jr. Microwave Journal Publisher/Editor The academic community has a long history of measuring the accomplishment of its members by their proclivity to publish and to base growth and advancement on the sheer quantity of those publications. “Publish or...

Technical Note Design Equations for Maximum Power Transfer in Back-to-back Stacked Microstrips K. Rambabu, M. Ramesh and A.T. Kalghatgi Please click here to view the pdf file of the Technical Note...

RAWCON ’99 Conference Report The 1999 IEEE Radio and Wireless conference (RAWCON ’99) was held in Denver, CO August 1–4, and proved to be a great success. This conference has evolved over the past few years into a very solid technical meeting, which emphasizes the interdisciplinary understanding of technologies...

Components Five-bit Digital Attenuator The model AD280-25 GaAs IC FET five-bit digital attenuator operates over the frequency range from DC to 2 GHz and features a least significant bit of 0.5 dB and a total attenuation of 15.5 dB. Bit values are 0.5, 1, 2, 4 and 8 dB....

Sources Synthesized Telemetry Transmitter The ST400QF series airborne synthesized patented FEHER quadrature phase-shift keying (QPSK) telemetry transmitter doubles the information bandwidth (when compared to conventional PCM-FM) while utilizing class C power amplifiers, which maintain the power efficiency associated with standard FM transmitters. Available in 2, 5, 8 and 10...

Systems Microwave Radios These microwave radio systems are designed for all frequency bands between 20 and 40 GHz and have a transmission capacity from 1.5 to 34 Mbps, satisfying both European and North American standards. Configuration, settings and surveillance take place remotely using a Web-based PC interface. Each microwave...

Subsystems PCS-CDMA Repeater The model USRU-1900 compact, in-building PCS-CDMA repeater has an input level of –100 to –50 dBm and a gain of 60 dB. The compact, cost-effective unit offers low power consumption and easy installation. Ace Technology, Chatsworth, CA (818) 718-1534. Radio Modem Transceiver The model RF9600 radio...