Communications: radio wave antennas – Antennas – With vehicle
Patent
1990-03-23
1991-05-21
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343722, 343858, 343901, H01Q 1100, H01Q 1320, H01Q 1000, H01Q 1500
Patent
active
050179357
ABSTRACT:
A multiband antenna system for use in a motor vehicle comprising an antenna unit responsible for first and second frequency bands. The antenna unit is electrically coupled to a first conduit tube which is in turn coupled coaxially to a second conduit tube with a capacitor being interposed therebetween. The capacitor is arranged so as to act as a short with respect to the first frequency signal and act as an open for the second frequency signal. The first conduit tube is connected to a first feeding terminal for deriving the second frequency signal and the second conduit tube is coupled to a second feeding terminal to derive the first frequency signal. This antenna system is constructed by using only one antenna unit having a predetermined length, thereby allowing simplification of the arrangement of the antenna system for easy manufacturing.
REFERENCES:
patent: 3725942 (1973-04-01), Ukmar
patent: 4647941 (1987-03-01), Myer
patent: 4675687 (1987-06-01), Elliott
patent: 4748450 (1988-05-01), Hines et al.
patent: 4850034 (1989-07-01), Campbell
"AM-MF-Mobile Telephone Combined Tri-Bandantenna for Vehicles", by K. Taniyoshi et al; Fujitsu Ten Technical Report, Apr. 1989, vol. 7, No. 1.
Hayashi Akihiko
Torii Akira
Yamazaki Toru
Brown Peter Toby
Nippondenso Co. Ltd.
Wimer Michael C.
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