Communications: radio wave antennas – Antennas – With vehicle
Patent
1988-06-27
1990-11-06
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343791, 343853, 343901, 343905, H01Q 132, H01Q 904
Patent
active
049689916
ABSTRACT:
A multiband antenna system for use in a motor vehicle, which includes a one-unit antenna section coupled to a transceiver for transmission and reception of a signal with a frequency in a first frequency band and a receiver for reception of a signal with a frequency in a second frequency band. The antenna section, being provided so as to be protruded upwardly from the motor vehicle, comprises a first antenna element adapted to operate with respect to the first frequency band and a second antenna element adapted to operate with respect to the second frequency band different from the first frequency band. The second antenna element is made up of a conductor tube which is in turn introduced into the motor vehicle and further extends up to the transceiver. A center conductor line is coaxially encased in the conductor tube so as to make up a coaxial line, one end of which is connected to the first antenna element and the other end of which is coupled to the transceiver. Also included in the system is a connector which performs coupling between the conductor tube and the receiver. Between the connector and the transceiver is provided a noise-reduction device which has a high inductance so as to cut off noises led to the coaxial line and introduced through the connector into said receiver.
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Nippondenso Co. Ltd.
Wimer Michael C.
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