Communications: radio wave antennas – Antennas – With vehicle
Patent
1993-05-05
1995-04-11
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343722, 343749, 343791, H01Q 132
Patent
active
054062969
ABSTRACT:
A three-wave antenna for vehicles which includes a monopole antenna element which has an electrical length of approximately 1/4 of the wavelength in the FM broadcast band along with a double sleeve used to prevent current flow and with a second double sleeve used for phase adjustment that are installed coaxially with the antenna element. The positional relationships between the inner and outer cylinders of each one of the first and second double sleeves relative to the antenna element are respectively specified. In addition, an antenna attachment which has a capacitive reactance and is installed at the base of the antenna element so that it cancels the inductive reactance of the antenna and causes the impedance of the antenna to approach a prescribed value is employed together with a wave splitter which includes a high pass filter that has a double tuning function with respect to the inductive reactance and the capacitive reactance and a low pass filter that separates the AM/FM broadcast band signals from the telephone band.
REFERENCES:
patent: 4509056 (1985-04-01), Ploussios
patent: 4748450 (1988-05-01), Hines et al.
patent: 5079562 (1992-01-01), Yarsunas et al.
patent: 5248988 (1993-09-01), Makino
Egashira Yoshimi
Yamakawa Katsuhiko
Harada Kogyo Kabushiki Kaisha
Wimer Michael C.
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