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The Commercial Market First Global Personal Satellite Communications Service Introduced COMSAT Personal Communications has announced global coverage for its Planet 1SM personal communications service, which uses portable, notebook-sized satellite telephones to provide voice, fax and data communications worldwide. The service is carried over four International Maritime Satellite Organization (INMARSAT)-3...

The Book End  Wireless and Personal Communications Systems Vijay K. Garg and Joseph E. Wilkes Prentice Hall PTR 445 pages; $68 The emerging personal communications service (PCS) will enable users to transfer all forms of information economically between any desired location. This book describes the personal communications network (PCN)...

Versatile PCS/DCS Patch Antennas Cushcraft Corp. Manchester, NH Today's personal communications service (PCS) and digital communications system (DCS) operators need to expand coverage and capacity while controlling infrastructure costs. The microcells, picocells and repeaters require a low cost, high performance antenna to provide concentrated coverage for PCS and DCS...

A Space Simulation Chamber with Thermal Ramping Environmental Stress Systems Inc. (ESS) Sonora, CA For many years there has been a requirement for microwave components used in aircraft, missiles and satellites to be screened environmentally for mission-critical functionality and latent defects affecting long-term reliability. Typically, these screens subject the...

A Vector Attenuator for Feedforward Amplifier and RF Predistortion Use Micro-Precision Technologies Inc. (MPT) Salem, NH Feedforward amplifiers and RF predistortion circuits used in cellular radio base stations require gain and phase adjustment in their cancellation loops. The classical approach to this requirement has been through the use of...

Multi-order Cancellation Technology This article describes a multi-order cancellation technique that, when applied to microwave mixers, can improve their port-to-port isolation significantly. Two different cancellation methods are discussed and test data are presented. Frank Xiaohui Li and Greg Corsetto Watkins-Johnson Co. Palo Alto, CA As wireless communication markets continue...

Active Doubly Balanced Mixers for CMOS RFICs Patrick J. Sullivan and Walter H. Ku University of California, San Diego, Department of Electrical and Computer Engineering La Jolla, CA Bernard A. Xavier Hughes Network Systems San Diego, CA As the gate length of standard CMOS processes decreases into the submicron...

MMW Digital Radio Front Ends: Market, Application and Technology Lamberto Raffaelli ARCOM Inc. Salem, NH Point-to-point mm-wave (MMW) digital radios offer unprecedented opportunities to the microwave industry. This technology, which was developed mainly for military applications, is finally finding a good market in the commercial arena. Along with automotive...

A Pin Diode Antenna Switch that Doubles as a Combiner Greg Adams VIZ Manufacturing Co. Philadelphia, PA Kong S. Luen AeroComm Ltd. Germantown, MD Twice a day, at weather stations around the world, a weather balloon is launched and atmospheric soundings record temperature, pressure, relative humidity and wind velocity...

Macro File and Design Window Compression Load Pull Measurements This article describes measurement and evaluation algorithms that allow full load pull tests to be performed while driving transistors automatically into desired gain compression and measuring a selection of parameters, such as output power, gain, efficiency, intermodulation, adjacent-channel power (ACP),...