Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1996-10-11
1998-11-24
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Spiral or helical type
343745, 343749, H01Q 136
Patent
active
058414070
ABSTRACT:
An antenna includes a conductive coil electrically coupled to a wave launching structure and configured such that a plurality of capacitances act electrically in parallel with a plurality of distinct portions of the conductive coil. The capacitances configure what would otherwise be a conventional normal-mode helical antenna for operation at multiple, closely spaced resonance frequencies. The antenna operates at the multiple resonance frequencies with only a small loss of efficiency relative to the maximum response of a conventional normal-mode helical antenna that has a single resonance frequency. Also, the antenna in accordance with the invention is self-duplexing, eliminating the need for complex and expensive duplexing circuitry.
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John D. Kraus, Antennas, Second Edition, 1988, Copyright McGraw-Hill, Inc., pp. 265-338.
ACS Wireless, Inc.
Ho Tan
Le Hoanganh T.
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