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Industry News

SELEX GALILEO Takes Singles Title

SELEX S&AS and Galileo Avionica are now operating internationally as a single company within the Finmeccanica Group and will be known as SELEX GALILEO. Historically both companies have traded separately and each has developed a strong client base and a reputation for excellence. The new name celebrates this tradition...
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European First for Astrium Ka-band Satellite

Astrium has been selected by Eutelsat Communications to deliver the first European multi-beam satellite to operate exclusively in the Ka-band and dedicated to providing broadband and broadcast services across the wider Europe. Currently designated as KA-SAT, the satellite marks a material step forward in multi-beam satellites. It will be...
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Ultra-wideband Beginning to Take Off

The market for ultra-wideband (UWB) silicon is finally beginning to take off, reports In-Stat. Though regulatory hurdles over UWB still persist worldwide, the first UWB-enabled notebook PCs have shipped this year from Dell, Lenovo and Toshiba, the market research firm says. “The primary question for UWB now is: Will...
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The Book End

Microwave Filters for Communication Systems: Fundamentals, Design and Applications R.J. Cameron, C.M. Kudsia and R.R. Mansour Wiley Interscience • 802 pages; $135 ISBN: 978-0-471-45022-1 This book captures the fundamentals and practical aspects of modern microwave filter design. Chapter 1 is devoted to an overview of communication systems. The principles...
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Around the Circuit

Industry News John Dunbabin , owner and president of Connecting Devices Inc. (CDI), passed away on September 8, 2007, from pancreatic cancer. A graduate of Cal Poly, San Luis Obispo, with degrees in mechanical engineering and business, John went to work for CDI. In 1975, he and his partners,...
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An Enabling New 3D Architecture for Microwave Components and Systems

How would you like to design circuits with perfectly shielded, low-loss, purely TEM broadband transmission lines, which could be stacked next to and on top of each other with no coupling? The lines can be tens of centimeters long, cross at multiple levels and at any angle, and holes...
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Design of a Microwave Group Delay Time Adjuster and Its Application to a Feedforward Power Amplifier

This article presents a design method for a microwave group delay time adjuster (GDTA) and its application to a feedforward (FFW) power amplifier (PA). The GDTA consists of a variable capacitor and a variable equivalent inductor. The variable equivalen...
As linear modulation and demodulation is adopted in communication systems for spectrum efficiency, the system performance is limited due to nonlinearity, particularly in the power amplifier. The nonlinearity of a system can be explained as AM-AM, AM-PM, intermodulation distortion (IMD) and adjacent channel leakage ratio (ACLR). Several linearizing techniques...
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High Efficiency Broadband Power Amplifiers

This article is devoted to the design of broadband high efficiency power amplifiers for microwave and RF applications through the synthesis of the load impedance (or load admittance) required by power transistors at fundamental and harmonic frequencies...
The technical definition of an amplification class is not obvious. Patents are among the best documents to explain and define what an amplification class is. 1,2 Reviewing the claims sections of those documents is an interesting exercise in understanding the inherent complexity of an amplification class definition. From a...
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