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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...

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...

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...

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...

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...

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...

Tutorial Phase Noise Theory and Measurements: A Short Review Bar-Giora Goldberg Please click here to view the pdf file of the Tutorial...

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...

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...

K-band Quadrature Mixers with Plastic-packaged Diodes Matjaz Vidmar University of Ljubljana, Slovenia Quadrature mixers (also known as IQ mixers) are important signal-processing components in radio transmitters (as vector modulators) and radio receivers (as image-reject mixers and/or demodulators) as well as other microwave equipment (phase-locked loops (PLL)). A quadrature mixer...