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Industry News

The Book End

Coplanar Microwave Integrated Circuits Ingo Wolff Wiley Interscience • 557 pages; $120 ISBN: 0-471-12101-0 The subjects of this book—materials, technology, design and realization of coplanar microwave integrated circuits—combine the research results of a large research group under the leadership of the author. Chapter 1, the introduction, describes the different...
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A Practical Method for Determination of HBT Thermal

A practical and reliable method for the determination of thermal resistance and its power dependence is presented. This method requires only forward Gummel data at different ambient temperatures and at different collector-emitter bias vo...
Heterojunction bipolar transistors (HBT) have demonstrated high power output densities at microwave frequencies and are increasingly utilized in the design of RF circuits such as power amplifiers, oscillators and mixers. 1 Thus, an accurate large-signal model for HBT devices is of great importance in designing such circuits, especially when...
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A Feed-forward Amplifier Using an Equal Group-delay Signal Cancellation Technique

In this article, new signal cancellers that can match the out-of-phase and group delay of two signal paths simultaneously are proposed. The simultaneous matching of the out-of-phase and group-delay time between two paths can permit broadband signal can...
Modern wireless communication systems utilize digital modulation techniques employing linear complex coding schemes to maximize the channel throughput available capability. Also, a broader channel bandwidth is used for more data transmission than before. In addition, as various communication services, such as cellular phone (IS-95), personal communication service (PCS), IMT-2000...
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New Products

GaN Broadband Power Amplifier The model SSPA 0.5-3.0-50 is a high power, broadband, GaN RF amplifier that operates in a frequency range from 0.5 to 3 GHz. This PA is ideal for broadband military platforms as well as commercial applications because it is robust and offers high power over...
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Advanced Control Components Receives $3.7 M Production Order

Advanced Control Components Inc.</B> announced that it has received a production order in excess of $3.7 M from the National Radio Astronomy Observatory for a dual-channel downconverter/switch matrix used on the ALMA Program.
Advanced Control Components Inc. announced that it has received a production order in excess of $3.7 M from the National Radio Astronomy Observatory for a dual-channel downconverter/switch matrix used on the ALMA Program. ALMA (Atacama Large Millimeter Array) is an international collaboration to develop a world-class telescope composed of...
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Ask Harlan: Question of the Month - April 2007

Published April 6, 2007 In an effort to better combine the editorial content of our magazine with our newly developed and retooled on-line presence, we have decided to expand Harlan's RF and microwave engineering advice into a monthly feature that appears in Microwave Journal. Harlan has selected one question...
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A Varactor-tunable Filter with Constant Bandwidth and Loss Compensation

This article presents the basic concept and realization of a bandpass varactor-tunable filter with constant bandwidth and loss compensation. The filter components are based on step-impedance planar resonators, while the equalizing circui...
Varactor-tunable filters attract the attention of microwave specialists due to a number of advantages that can improve the overall performance of communications and radar receivers, as well as measuring equipment. One of the drawbacks of such filters is a considerable variation in bandwidth (BW) and insertion losses (IL) within...
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The Design of a Band-rejected Cross Semi-elliptic Monopole Antenna for UWB Applications

A cross semi-elliptic monopole antenna with a band-rejected characteristic is presented and investigated. By embedding four L-shaped slits on the cross semi-elliptic monopole, an antenna with a rejected band from 5.29 to 6.20 GHz can be ...
Planar monopole antennas, with their advantages of low cost and wideband characteristics, are widely used in wireless applications. 1 However, they suffer from distortion of the radiation pattern at higher operating frequencies, which leads to a directional radiation. 2,3 A cross monopole antenna has been implemented to overcome the...
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Catalog Update

Measurement Journal The Agilent Measurement Journal is a quarterly technical publication that provides today’s engineers with the information they need to stay ahead of the competition and on top of the latest technologies, trends and Agilent measurement solutions. It covers a wide range of industries, including aerospace and defense,...
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