Title :
Circular array with frequency-invariant pattern
Author_Institution :
Rome Air Dev. Center, Hanscom Air Force Base, MA, USA
Abstract :
The author addresses the wideband feature of circular array patterns and the bandwidth limitations. In particular, he outlines the pattern synthesis technique and presents some experimental data. To demonstrate the feature of frequency-invariant patterns, a circular array was built with 64 elements comprising monopoles in a parallel-plate region. The typical example of three 30-dB Chebyshev patterns for 4, 5, and 6 GHz demonstrates deep stable nulls and no beam squint over a 40% bandwidth. It is concluded that circular arrays can generate high-quality patterns, with narrow beams and deep pattern nulls, that are stable over a very large bandwidth.<>
Keywords :
antenna radiation patterns; microwave antenna arrays; 4 GHz; 5 GHz; 6 GHz; Chebyshev patterns; SHF; bandwidth limitations; deep pattern nulls; experimental data; frequency-invariant pattern; frequency-invariant patterns; monopoles; parallel-plate region; pattern synthesis technique; wideband circular array; Antenna arrays; Bandwidth; Chebyshev approximation; Coaxial components; Electromagnetics; Filters; Frequency; Phased arrays; Signal synthesis; Wavelength measurement;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134998
