RF & Microwave Industry News

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Two new surface-mount I-Q modulators/demodulators have been added to the “RFID by M/A-COM” series of products that are designed for RFID, wireless handset and base station applications. The MA4IQP900L-1291T and the MA4IQP900H-1291T HMIC I-Q modulators/demodulators are compact and highly functional devices using low and high barrier silicon Schottky diodes,...

A series of wideband 50 ? coaxial test cables has been introduced that feature extra rugged construction with integrated strain relief for longer life. The CBL-series Coaxial-Flex test cables are designed for use from DC to 18 GHz and are useful over a temperature range of –55° to +105°C....

Broadband Wireless Access (BWA) enables a variety of applications ranging from high bandwidth backhaul for data networks to simple wireless DSL for residential customers. Although this is a large and diverse market, most of these wireless systems are implemented using proprietary or vendor specific technologies. There is almost no...

Mobile communication systems currently use multi-carrier/multi-channel schemes for effective use of the frequency spectrum resources. The intermodulation has a serious impact on these communication systems in terms of adjacent channel interference, resulting in an increase of bit error rates. As the power amplifier operates close to the saturation region...

There has been a widespread trend toward higher levels of integration in microwave and millimeter-wave system design, motivated by a desire to reduce cost, size and complexity, particularly as many old applications are being re-invented in array architectures. The most commonly used format for achieving high levels of integration...

Parabolic-reflector antennas are widely used as microwave directional antennas. Unfortunately, the illumination of a parabolic mirror becomes rather inefficient when the dimensions of the mirror are not large enough compared to the wavelength. On the other hand, the directional gain of microwave cavity antennas1 is rather small, since it...

The demand for a signal source with high stability and low phase noise increases in microwaves, millimeter-wave communications and radar systems. High frequency signal sources can easily be obtained by multiplying low frequency signals that have relatively high stability and low phase noise. In general, however, frequency multipliers include...

Due to the inherent upper limit in operating frequency of active devices in local oscillators, a frequency multiplier, in conjunction with a low frequency local oscillator, has often been used as a signal source, providing better overall phase-noise performance and low cost realization. 1 A balanced configuration has been...

Solid-state switches based on high electron mobility transistors (HEMT) can be fabricated with a variety of different semiconductor technologies, usually selected on the basis of performance requirements. Such solid-state switches have been used successfully as control devices for transmitter and receiver switching functions in various digital communications systems. In...

A monopole antenna is a very simple and efficient radiating element.1 However, this antenna suffers from a limited bandwidth and distorted radiation characteristics. In the coming generation of mobile communications, multimedia services will be provided by a mobile handset, which must therefore be equipped with a broadband antenna. It...