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Industry News

International Report

International Report Asia/Pacific Region Sets the Standards Transparency, inclusion and the needs of developing nations were among the main topics discussed by the twenty-two top executives representing the national standards bodies of the Asia/Pacific region when they convened at ASTM International for a two-day Open House. The recent event...
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The Book End

RF and Microwave Semiconductor Device Handbook Mike Golio, Editor-in-Chief CRC Press 311 pages; $99.95 ISBN: 0-8493-1562-X The aim of this book is to provide a single volume comprehensive reference for high frequency semiconductor devices. Written by twenty experts in their field, it is intended to be a starting point...
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A Nonlinear Circuit Simulation Model for GaAs and InP Heterojunction Bipolar Transistors

Over the last several years, III-V heterojunction bipolar transistors (HBT) have become an increasingly important technology for a variety of rapidly growing markets. GaAs-based HBTs now play a major role in wireless communications. Key applications include power amplifiers for handset phones, wireless LAN and numerous other high speed analog...
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The Grid Amplifier: Enabling High Power Millimeter-wave Systems

There are a number of communications, radar and imaging applications spanning Ka-band through W-band (26 to 110 GHz) that require transmitter output powers in the range of a few watts to a few tens of watts. Vacuum-tube sources and amplifiers have long been available that can produce output power...
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An Actively-controlled Microwave Reflecting Surface with Binary-pattern Modulation

This article describes an actively-controlled reflecting surface, capable of modulating the microwave energy incident upon it. The surface is a composite structure holding an array of conventional semiconductor diodes excited with a set of pulses in a ...
For specific applications, there is a need for materials or composite structures which can reflect and/or absorb the electromagnetic (EM) energy incident upon them in a desired or controllable fashion. Such reflective EM absorbing/reflecting materials 1-3 are useful in designing smart radar cross-section (smart RCS) surfaces and radio frequency...
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2003 Editorial Index

ANTENNAS Everett, Carl L . "Using Guided Wavelength as a Basis for the Design of Dielectric Rod Antennas," No. 5, p. 222. Haupt, Randy "Generating a Plane Wave in the Near Field with a Planar Array Antenna," No. 9, p. 152. Jang, Yong-Woong and Ho-Sub Shin "A Wideband and...
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Flash in the Plan

Directed-energy weapons remain more experimental than available.
The detonation by the United States of a nuclear warhead 30,000 feet above Johnston Atoll in July 1962 lit up the night sky above the Hawaiian Islands, 800 miles away. It also created a power surge that shut down the streetlights and phone system of Oahu as well as...
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A Brief Exposure to Ultra-wideband Signaling

Ultra-wideband (UWB) techniques are based on the generation of extremely short digital pulses in the sub-nanosecond range (1 to 1000 picoseconds). The technology is vastly different from classical radio transmission. The extremely short pulses are gene...
Baseband pulses are video or carrier-less pulses of very short duration. Their spectral content is concentrated primarily from zero frequency through the microwave region of the spectrum. This tutorial attempts to describe some of the vagaries of these pulses and their use in ground penetration radars and communications. Figure...
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