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Industry News

Application of GTEM Cells to Wireless Communication Transceiver Designs

The GTEM cell has been widely accepted as a sufficient tool in electromagnetic compatibility for both radiated susceptibility tests and radiated emission tests. In this article, the relationships among basic quantities such as input power, electric fie...
The gigahertz transverse electromagnetic mode (GTEM) cell was first proposed in 1987 1 and subsequently patented in 1989 by D. Konigstein and D. Hansen 2 as a high frequency variant of the transverse electromagnetic mode (TEM) cell, which is also known as the Crawford cell. 3 The GTEM cell...
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Generating a Plane Wave in the Near Field with a Planar Array Antenna

This article presents a method of generating an approximate plane wave in the near field using a planar phased array antenna. Optimized complex array weights are found using a genetic algorithm and a least squares solution. The genetic algorithm (GA) p...
Measuring far field antenna patterns requires separating the transmit antenna and the antenna under test (AUT) by a large distance in order to minimize the field amplitude and phase variations across the test aperture. When the AUT is many wavelengths across, the far field distance becomes quite large. Thus,...
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A Universal Oscillator Analysis Technique that Accurately Estimates Frequency and Output Power

During the last few decades, many different oscillator models and analysis techniques have been presented. From the negative impedance model, cavity type and DROs to the general feedback type, all oscillators have one common property. They are nonlinea...
Generally, an oscillator can be seen as a positive feedback system. It usually consists of an amplifier followed by a resonator, which is fed back to the amplifier input, as shown in Figure 1 . The amplifier task is to compensate for the losses in the resonator, and the...
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Microwave in Europe: Trends Shaping the Future

What are the drivers shaping the world's microwave markets? Will the industry continue to benefit from mobile and personal communications? And what will be the contribution of defence applications?
1996 saw Microwave Journal publish an in-depth look at the European microwave industry. It considered technological developments, pinpointed areas of activity and attempted to identify trends that would shape the future. In the light of the market's subsequent downturn, particularly in the telecommunications industry and the knock-on effect that...
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Welcome to European Microwave Week 2003

Willkommen in München, home of the Oktoberfest. This October, though, the microwave community will also be celebrating a "Microwavefest," as European Microwave Week follows immediately on from the world famous beer festival. While the Oktoberfest may be enjoying its 170 th anniversary, the EuMW is a relative youngster, celebrating...
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European Microwave Exhibition 2003

The following list is complete at the time of going to press. GP stands for German Pavilion.
7 Layers ......H109 A.T. Wall Companies ......H53 ACAL GmbH ......GP Accent Optical Technologies ......H93 Actipass Co. Ltd. ......H95 Aeroflex ......H139 Agere Systems ......H52 Agilent Technologies ......G48 Alfred Tronser GmbH ......H51 American Technical Ceramics ......H74 Amplifier Research ......H101 Analog Devices ......G18 Anaren Microwave Inc. ......H12 Andrew Corp. ......G52 Anritsu Ltd....
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Quarter-wavelength N-way Power Dividers/Combiners: Historical Aspects and New Modifications

Quarter-wavelength, in-phase, N-way power dividers/combiners are widely used in antenna arrays, power amplifiers and transmitters, mixers, phase shifters and vector modulators. This article briefly reviews the history of known quarter-wavelength power ...
The simplest quarter-wavelength, multi-port power divider, known as a Wilkinson divider, 1-2 provides a match at all ports, low loss, in-phase power splitting and high isolation between output ports. Historically, this device was reported earlier. 3-7 It was also described 5 together with the so-called Gysel-type combiner, 8 based...
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Ask Harlan: October 7, 2003

ASK HARLAN YOUR RF & MICROWAVE TECH Q&A RESOURCE You may know Harlan Howe from his twelve years as publisher and editor of Microwave Journal ®, or from his 34 years as a Microwave design engineer and engineering manager, or from his service as an IEEE fellow and past...
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