Antennas

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Measuring far field antenna patterns requires separating the transmit antenna and the antenna under test (AUT) by a large distance in order to minimize the field amplitude and phase variations across the test aperture. When the AUT is many wavelengths across, the far field distance becomes quite large. Thus,...

Wireless communication applications have really taken off over the past two decades. In addition to voice services, wireless systems are now also handling an increasing volume of data traffic, with a demand for high transmission capacities. To provide these capacities, mobile radio cells (AMPS, GSM, PCS and UMTS) are...

Enhanced performance is needed from antennas, radomes and other microwave components to support ever-increasing functionality for military communications and electronic warfare (EW) applications. There is a continuing demand for antennas with broader bandwidth, higher power handling and better controlled radiation patterns, while at the same time reducing size and...

When designing dielectric rod antennas for maximum bandwidth, maximum gain, minimum beamwidth and/or low side lobes, design parameters reported in the literature are provided in terms of free-space wavelength. While this methodology lends itself well to other antenna types, it is not as useful when used to describe dielectric...

Wireless device manufacturers today must fit a growing amount of functionality into continuously decreasing circuit board space. In particular, finding space for the antenna without compromising its performance characteristics has become a major challenge. The AccuWave™ 5800 antenna is an ultra-small tri-band device designed to provide full coverage of...

Fabricating a high performance 2 x 16 transmit/receive (T/R) switch to feed a millimeter-wave Rotman or Lunenburg lens antenna array has in the past been a complex and space-consuming configuration. A new T/R switch assembly has been designed that features a compact, unique package containing a 2 x 16...

Since microwave communications equipment is low profile and light weight, low profile and light weight antennas are essential. A microstrip antenna has been developed to meet this requirement. Microstrip antennas offer a conformal structure, low cost and ease of integration with solid-state devices, and are low profile and lightweight....

The design of a millimeter-wave antenna with a pencil-beam pattern is complicated when using a slotted waveguide and results in unacceptable dissipating losses, as high as 8 to 10 dB for a microstrip (RT duroid or Cu/PTFE substrate) distributor. This is why most submillimeter-wave antenna designers avoid traditional VHF...

From mobile telephones to wireless Internet access to networked appliances and peripherals, there is an increasing reliance on wireless communications to provide or enhance functionality for products and services. The wireless communications industry continues to generate new products and applications for consumers and new opportunities for businesses. The enormity...

With the steady improvements in tracking radar technologies over the past twenty years, the diameter requirements for antennas has been reduced to match the improvements in transmitter power and receiver sensitivity. This has led to a need for shorter feeds for use in Cassegrain configurations. Antenna feeds have recently...