Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-05-22
1999-10-05
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343715, 343725, 343729, 343895, 343900, H01Q 124, H01Q 136
Patent
active
059631708
ABSTRACT:
A fixed dual frequency band antenna for a dual frequency band radio transceiver where the two frequency bands are not harmonically related. The antenna includes a straight radiating antenna portion terminated by a helical wire radiating antenna portion, with the total electrical length of the antenna being approximately three quarters of the wavelength at the center frequency of the higher of the two frequency bands. A conductive radiating cap terminates the helical portion and a conductive antenna base is connected to the straight portion at the end opposite the helical portion. A matching circuit coupled between the base and the transceiver circuitry is arranged to substantially cancel the reactive portion of the impedance of the antenna for both frequency bands and to substantially equalize the resistive portion of the impedance of the antenna to the resistive portion of the output impedance of the radio transceiver. The length of the antenna is such that, together with the matching circuit, the resistive portion of the impedance of the antenna is substantially the same for both frequency bands.
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patent: 5801662 (1998-09-01), Itoh
Garner William J.
Korisch Ilya A.
Lucent Technologies - Inc.
Nguyen Hoang
Wong Don
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