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Industry News

Techniques of RFID Systems: Architectures and Applications

From its first use in World War II, to differentiate between enemy and friendly aircraft, RFID has come to an era where it is used as an important identification tool, providing added security and conveniences in our daily lives. Its components and fea...
Radio frequency identification (RFID) has become and will continue to be very important in the area of automated identification. With the current emerging RFID technology, it is now possible to have an under-the-skin ATM/credit card or to pay up for a trolley full of goods by pushing across an...
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A Dual-passband Waveguide Filter with a Canonical Structure for Ka-band Satellite Applications

This article presents the implementation techniques for a six-pole, dual-passband waveguide filter with an asymmetric canonical structure for Ka-band satellite applications. An asymmetric canonical structure is chosen, not only to increase the transmis...
For the effective use of the available frequency spectrums, the channels of conventional communications satellite systems are allocated contiguously in frequency. Each channel is filtered by a channel filter with high frequency selectivity, amplified by a high power amplifier and transmitted to the ground through a single beam. Modern...
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Periodically Loaded SSS Coupled-line Filter for Second Harmonic Suppression

A suspended substrate stripline (SSS) filter using coupled-lines with periodical capacitive loading is proposed to suppress the second harmonics. The required capacitive loading is achieved by using elevated circular posts in the filter cavity. An exam...
Rapidly growing wireless systems call for low loss filters with special requirements such as a suppressed second harmonic and a wide stop band region. Although conventional parallel coupled-line filters have many salient features, 1 their spurious response at 2f o make them unsuitable for modern day wireless systems. This...
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Matrix Switches: Blocking versus Non-blocking

In the RF and wireless industries, system performance requirements seem to expand almost daily. These systems continue to encompass more and more of today’s broad-reaching technologies. Engineers working in this environment are often tasked with designs that must combine and distribute RF signals from multiple input devices while, at...
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Catalog Update

Military Brochure The revised military brochure from AR Worldwide Modular RF features a family of booster amplifiers for tactical military radios that covers 30 to 512 MHz and 12 to 40 W. The family features several versions including manpack or vehicular mounted, manual or automatic band switching and a...
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New Products

Space/Flight Qualified Low Noise Amplifiers These low noise amplifiers are designed, manufactured, tested and screened to be extremely reliable and rugged for space or flight applications. Screening options include MIL-STD-883 and MIL-PRF-38534. In addition to the testing and standards that go into these amps, the company also provides complete...
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The Book End

Modern Microwave and Millimeter-Wave Power Electronics Robert J. Barker, John H. Booske, Neville C. Luhmann, Jr. and Gregory S. Nusinovich, Editors Wiley Interscience • 864 pages; $145 The designers of present and future microwave and millimeter-wave power electronics systems need to be aware of the unique and rich characteristics...
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TNO Joins Dutch Biomedical Consortium

TNO is to participate in a Dutch consortium on biomedical materials. The BioMedical Materials consortium (BMM) aims to provide a leadership position to the Netherlands in biomedical materials and will facilitate novel product development for various medical applications. The BMM will use public-private partnerships to fully utilize the strong...
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Ask Harlan, June 29, 2006

Harlan Howe has 34 years experience as a microwave design engineer and fifteen as publisher and editor of Microwave Journal ® , and is an IEEE Fellow and past president of MTT-S. He's here to answer your questions on RF and Microwave engineering.
Published June 30, 2006 From: Jean Almira, Eudyna Devices Asia Singapore Dear Harlan, I would like to ask your advice regarding directional couplers. I am confused about backward wave couplers and forward wave couplers. I have read some articles: waveguide couplers in the forward direction (forward wave couplers) and...
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