Antenna used for a plurality of frequencies in common
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United States of America Patent
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-
Sep 28, 1993
Issued Date -
N/A
app pub date -
Jun 1, 1992
filing date -
Dec 12, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna used for a plurality of frequencies in common according to the present invention has two signal feeding systems for an integrated antenna. The antenna is so constructed that the signal feeding systems are perfectly isolated in DC from each other through a capacitor and at the same time in high frequency, only the signal system for the car telephone frequency band, which is a communication with a moving body, is coupled with the whole antenna, while the signal system for the AM/FM radio frequency band is separated from the antenna radiator portion (radiating element) working at the car telephone frequency band. Owing to a great difference in the frequency between the AM/FM radio frequency band and the car telephone frequency band, no disturbance such as mutual interference, etc. is produced and thus it is possible to obtain stable signal systems separated from each other.
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