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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...

Dielectric resonator antennas (DRA) are a relatively recent addition to antenna technology and have been the focus of increasing research activity over the last two decades. A DRA is a resonant antenna fabricated from low loss microwave dielectric material whose resonant frequency is predominantly a function of size, shape...

Conference Information Attending the Conference Schedule of Events (175k pdf) Life in Long Beach (742k pdf) 2005 IMS Exhibitors (148k pdf) Long Beach Convention Center Floor Plan (193k pdf) 2005 IEEE MTT-S IMS Technical Program (pdf) jj You are invited to make the trip to Long Beach for the...

Industry News Spectrum Control Inc. , a designer and manufacturer of electronic control products and systems, announced that Spectrum Microwave Inc., its wholly-owned subsidiary, has acquired substantially all of the assets and assumed certain liabilities of Amplifonix Inc . Amplifonix, Philadelphia, PA, is a designer and manufacturer of RF...

The IEEE has begun work on two amendments to the IEEE 802.11 standard for wireless local area networks (WLAN). One will aid in interworking between IEEE 802.11 equipment and external networks and the other will enhance how network stations are managed. IEEE P802.11u, “Wireless LAN Medium Access Control (MAC)...

Due to intense vendor price competition and cellular operator negotiating clout, the power amplifier segment of both cellular infrastructure markets and handset markets has seen falling average selling prices (ASP) over the last several years, especially in the more mature markets such as GSM. But with the advent of...