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Industry News

A Multiposition Backup Switch

A DC to 3 GHz multiposition backup switch that features mechanically linked indicator circuits, TTL control, an immersion seal and multiple control circuit interfaces
July 1, 1998
A Multiposition Backup Switch Dow-Key Microwave Corp. Ventura, CA Today's high power RF communication systems often consist of multiple parallel amplifier stages to achieve high power and reliability. The use of RF transfer relays to provide automatic backup for a failed amplifier stage, as shown in Figure 1 ,...
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A 0.1 to 2.5 GHz Logarithmic Amplifier for RF Detection

This month's cover features a logarithmic detector controller IC that is the first of its kind to utilize a 0.1 2.5 GHz frequency range, offering a dynamic range of 65 dB and accuracy of ±1 dB
July 1, 1998
A 0.1 to 2.5 GHz Logarithmic Amplifier for RF Detection Analog Devices Wilmington, MA Logarithmic amplifiers typically are used to measure widely varying signal levels at high frequencies. These signals may vary in amplitude by 90 to 100 dB at frequencies to 3500 MHz. In addition, some log amplifiers...
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A Ka-band Linearizer for TWTAs

A predistortion-type linearizer designed to be installed within a high power traveling-wave tube amplifier to provide improved carrier-to-intermodulation performance and near-constant phase transfer characteristics
July 1, 1998
A Ka-band Linearizer for TWTAs Linearizer Technology Inc. Hamilton, NJ Even though traveling-wave tube amplifiers (TWTA) offer the best high power amplifier performance at high frequencies in terms of power, efficiency, size and cost, they lag behind solid-state power amplifiers in terms of linearity. Thus, some type of linearizer...
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An Internal Integrated Microstrip Antenna for PCS/Cellular Telephones and Other Hand-held Portable Communication Equipment

The advantages of a compact wideband internal integrated microstrip antenna compared to an external wire or retractable antenna for personal commuications service (PCS) and celllular telephones
July 1, 1998
An Internal Integrated Microstrip Antenna for PCS/Cellular Telephones and Other Hand-held Portable Communication Equipment A compact wideband internal integrated microstrip antenna for personal communications services (PCS) and cellular telephones has been developed. The internal microstrip antenna is extremely rugged and may be integrated into the PCB or plastic case...
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Don't Rule Out the MESFET!

The maturation of implanted GaAs MESFET technology, which supports key criteria for successful wireless products
July 1, 1998
Don't Rule Out the MESFET! Wes Mickanin TriQuint Semiconductor Hillsboro, OR The rapid increase in the number of wireless technology applications has finally launched the GaAs semiconductor industry onto a steeper growth curve. A variety of GaAs technologies compete for the best position with glowing reports of state-of-the-art devices...
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Oh, the Way We Were!

A look back at the changes that have taken place in the microwave industry since 1958, the year Microwave Journal was created
July 1, 1998
Oh, the Way We Were! As Microwave Journal celebrates its 40th anniversary this year, we take a look at how things were (or how we remember them as having been) when it all started, way back then. Alexander E. Braun West Coast Correspondent It was a time of Pickett...
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A New PCB Substrate Used for Patch Antenna Fabrication

Modeliing, fabrication and analysis of microstrip patch antennas
July 1, 1998
A New PCB Substrate Used for Patch Antenna Fabrication This article describes the modeling, fabrication and analysis of microstrip patch antennas. Extracting material parameters for a new PCB substrate as well as determining the suitability of this material for the fabrication of patch antennas are described. Microstrip test patterns...
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Around the Circuit

July 1, 1998
Around the Circuit   John J. Powell , founder of Sun-Tech Marketing, died May 27 in Scottsdale, AZ. He was 59 years old. Powell held senior management positions at Microwave Associates, where he began his career, and at Omni-Spectra Inc. He will be sorely missed by his many friends...
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New Literature

July 1, 1998
New Literature Product Brochure This 36-page brochure details the company's products for use in cellular and personal communications service, broadcast, microwave, enhanced specialized mobile radio and military markets. HELIAX" coaxial cables, connectors, accessories, assemblies, training and services are described. Specifications and product photographs are provided. Andrew Corp., Orland Park,...
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New Products: Components

July 1, 1998
COMPONENTS GaAs IC Transfer Switch The model AS127-59 GaAs IC four-port transfer switch is designed to combine transmit/receive and antenna changeover switching capability in one device. The switch offers a reduction in size and weight because it operates without a duplexer. The unit offers high linearity, which reduces the...
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