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Industry News

Prematching Tuners for Very High SWR and Power Load Pull Measurements

This month's cover features programmable prematching tuners that use a new calibration technique and interpolation routines with fine tuning resolution equivalent to manual tuners
Prematching Tuners for Very High SWR and Power Load Pull Measurements Focus Microwaves Ville St-Laurent, Quebec, Canada Load pull testing of high power transistors in the PCS and cellular frequency range (0.85 to 3 GHz) requires accurate tuning capability around 1 W output impedance or less. Meanwhile, RF power...
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High Power, Low Cost Ceramic Quadrature Couplers

Cellular and PCS ceramic quadrature couplers developed using a plated and bonded copper on ceramic process that provides 50 to 100 percent more power handling capability with little or no increase in size
High Power, Low Cost Ceramic Quadrature Couplers CirQon Technologies Corp. Gurnee, IL Many of today’s high power amplifiers for cellular and PCS base station use are assembled in a network composed of several medium power amplifier stages coupled with 90° quadrature hybrids or couplers. The quadrature couplers are preferred...
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A Transmit Frequency Converter for LMDS Set Top Box Applications

A frequency converter module set suitable for use in set top boxes in local multipoint distribution system (LDMS) applications
A Transmit Frequency Converter for LMDS Set Top Box Applications Vari-L Company Inc. Denver, CO A frequency converter module set suitable for set top boxes used in local multipoint distribution system (LMDS) applications has been developed. The module set has been designed in accordance with the standards established by...
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A High Stability Phase-locked Source for QAM Radio Application

A new 9 to 13 GHz high stability, low noise phase- locked source that addresses the 155 Mbps data rate requirements of quadrature amplitude modulation (QAM) radios
A High Stability Phase-locked Source for QAM Radio Applications Microwave dB Newbury Park, CA Consumers have pressured service providers who, in turn, have pressured equipment manufacturers to design wireless communications systems that are more reliable while simultaneously demanding significantly higher data rates. This new generation of radios provides high...
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New Fractal Antennas for Compact and Versatile Telecommunication Services

Base station multiband antennas based on the fractal-shaped antenna concept that operate concurrently at the GSM 900 and GSM 1800 bands
New Fractal Antennas for Compact and Versatile Telecommunication Services Fractus SA Barcelona, Spain The wireless telecommunication market is constantly subjected to turbulent and rapid changes. Today’s telecom applications require total mobility as well as constant improvement toward the integration of multiple services. These features, accompanied by an ongoing cost...
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Design of an Ultralinear Wideband Feedforward Amplifier Using EDA Tools

An electronic design automation (EDA)-based method to design an ultralinear wideband feedforward amplifier in the 460 MHz grequency band
Technical Feature Design of an Ultralinear Wideband Feedforward Amplifier Using EDA Tools Jianyi Zhou, Limin Feng, Xiaowei Zhu and Wei Hong Please click here to view the pdf file of the Technical Feature...
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Microwave FET Oscillators: An Analytic Approach to Simplify Computer-aided Design

A simple analytic approach to microwave FET oscillator design that defines explicit expressions for optimum values of feedback elements through transistor Z parameters
Technical Feature Microwave FET Oscillators: An Analytic Approach to Simplify Computer-aided Design Andrey V. Grebennikov Please click here to view the pdf file of the Technical Feature...
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Phase Noise Theory and Measurements: A Short Review

Phase noise theory, phase noise modeling of a VCO and phase-locked loop source with a focus on practical considerations and the various methods used to measure phase noise
Tutorial Phase Noise Theory and Measurements: A Short Review Bar-Giora Goldberg Please click here to view the pdf file of the Tutorial...
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Polarization Diversity Antennas for Compact Base Stations

The use of diversity reception for mobile radio base stations and a comparison of space and polarization diversity techniques
Polarization Diversity Antennas for Compact Base Stations This article describes the use of diversity reception for mobile radio base stations and compares the performance of space and polarization diversity techniques. In urban areas polarization diversity offers performance that is generally comparable with that of space diversity. The compact three-antenna...
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A Review of the 1999 Wireless Workshop

A look back at the 1999 Wireless Workshop held October 24-27 in Gold Canyon, AZ
A Review of the 1999 Wireless Workshop Frank Bashore Microwave Journal Staff The 1999 Wireless Workshop was held October 24-27 in Gold Canyon, AZ. The workshop is designed to serve as a technical forum and discussion group for various engineering and technical representatives from leading companies involved in the...
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