Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1996-08-02
1998-02-10
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With radio cabinet
343752, 343895, 343901, H01Q 124
Patent
active
057174091
ABSTRACT:
A dual frequency band antennas system where the two frequency bands are not harmonically related includes first and second antenna sections. The first antenna section comprises a straight rod, with the length of the rod being at least one quarter wavelength at the center frequency of the lower of the two frequency bands. The second antenna section includes a straight portion terminated by a helical wire portion, with the total electrical length of the second antenna section being substantially equal to the length of the straight rod. A conductive antenna base is connected to at least one of the first and second antenna sections. A matching circuit coupled to the base is arranged to substantially cancel the reactive portion of the impedance of the connected antenna section for both frequency bands and to substantially equalize the resistive portion of the impedance of the connected antenna section to the resistive portion of the output impedance of the radio transceiver to which the antenna system is coupled. The lengths of the straight rod and of the second antenna section are such that together with the matching circuit the resistive portion of the impedance of the connected antenna section is substantially the same for both frequency bands.
REFERENCES:
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patent: 5317325 (1994-05-01), Bottomley
patent: 5446469 (1995-08-01), Nakio
patent: 5469177 (1995-11-01), Rush et al.
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patent: 5504494 (1996-04-01), Chatzipetros et al.
patent: 5594457 (1997-01-01), Wingo
patent: 5606327 (1997-02-01), Elliott et al.
Garner William J.
Korisch Ilya A.
Hajec Donald T.
Ho Tan
Lucent Technologies - Inc.
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