Roof antenna with improved casing

Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna

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343715, 343711, H01Q 100, H01Q 132

Patent

active

054519675

ABSTRACT:
A roof antenna capable of receiving three kinds of bands, i.e., a FM radio band, an AM radio band, and a wireless-telephone band, includes an antenna element 10 having a structure that a conductor 15 winds around the insulator 16 in the form of a coil. A molded portion 14 is formed at the bottom of the antenna element, in which a trap coil is inserted. The electric length from the antenna top 11 to the internal metal fitting 17 at the lower end of the antenna element 10 is about a quarter of a FM radio wave. The electric length from the internal metal fitting 17 to the lower end of the trap coil 12 is about a quarter of a wireless telephone wave. A cover 19 supporting a basal part of the antenna element installs the first substrate 20 and the second substrate 21. The first substrate 20 and the second substrate 21 have a matching circuit, branching filters, and amplifiers.

REFERENCES:
patent: 4184162 (1980-01-01), Grashow
patent: 4675687 (1987-06-01), Elliott
patent: 5134419 (1992-07-01), Egashira
patent: 5349361 (1994-09-01), Egashira et al.
Patent Abstract of Japan, vol. 11, No. 312(E-548), Oct. 12, 1987, JP-A-62,105,537 (Sasaki Kazutoshi et al.).
Patent Abstract of Japan, vol. 15, No. 394(E-1119), Oct. 7, 1991, JP-A-03,159,402 (Egashira Riyousui).

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