Three-wave antenna for vehicles
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United States of America Patent
Stats
-
Apr 11, 1995
Grant Date -
N/A
app pub date -
May 5, 1993
filing date -
May 11, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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