Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna
Patent
1989-12-11
1991-10-15
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With lumped reactance filter in active antenna
343749, 343895, H01Q 501, H01Q 932
Patent
active
050578499
ABSTRACT:
To provide a single antenna suitable both for VHF as well as UHF television (TV) reception, without changing the length of the antenna, a core support rod (11) of, for example, flexible plastic material is resiliently coupled at one end to a connection terminal (29). Wound on the rod are two connected windings (12, 13), one of them being spiralled with wide spiral turns about the core support rod (11) throughout the major length of the antenna, the other winding (13) being wound closely or tightly thereabout. The two windings are capacitatively coupled by a turn or loop (17) of a third winding (18), pushed between the two last turns (15, 16) of the third winding (13) and electrically connected to the connection terminal (29). The distance (1.sub.1) between the third winding (18) and the connection terminal (29) is .lambda..sub.U /4, the distance between the end of the first winding (12) and the terminal is .lambda..sub.U /4, and which .lambda..sub.U and .lambda..sub. V are, respectively, the average or median wave lengths of the respective UHF and VHF TV signal bands.
REFERENCES:
patent: 4145693 (1979-03-01), Fenwick
patent: 4229743 (1980-10-01), Vo et al.
patent: 4675687 (1987-06-01), Elliott
patent: 4730195 (1988-03-01), Phillips et al.
Dorrie Horst
Militz Uwe
Robert & Bosch GmbH
Wimer Michael C.
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