Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1996-02-28
1997-02-18
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
343715, 343722, H01Q 150
Patent
active
056045077
ABSTRACT:
A wide-banded mobile antenna enhancing signal transmission by broadening the effective transmission bandwidth. The wide-banded mobile antenna is interchangeable with currently existing mobile antennas as the two use connectors established by industry. An antenna matching network is situated within a protective housing having a metal shield. A toroidal inductor is serially connected with the antenna and creates a parasitic capacitance with the metal shield. The resulting network, including the antenna, is tuned. An antenna compensating network increases the bandwidth of the antenna with a parallel resonance network. The parallel resonance network has a capacitor and an inductor connected in parallel to the antenna and each other. The parallel resonance inductor is oriented so that the fields it generates are perpendicular to those of the antenna and the matching inductor to prevent coupling between the inductors. An optional series resonant network may enhance the compensating network with a capacitor and inductor connected in series to the antenna and each other. The fields of the series resonant inductor are perpendicular to those of the parallel resonance inductor.
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Wheeler, Harold A.; "Fundamental Limitations of Small Antennas," Proceedings of the IRE; Dec. 1947; pp. 1479-1484.
Altshuler, Edward A.; "The Traveling-Wave Linear Antenna," IRE Transactions on Antennas and Propagation; Jul. 1961; pp. 324-329.
Wheeler, Harold A.; "The Wide-Band Matching Area for a Small Antenna," IEEE Transactions on Antennas and Propagation, vol. AP-31, No. 2; Mar. 1983; pp. 364-367.
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Antenex, Inc.
Le Hoanganh T.
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