Transmission and reception apparatus for automobile

Details Transmission and reception apparatus for automobile Transmission and reception apparatus for automobile

H - Electricity

01

Q

351/7, 333/72

H01Q 1/32 (2006.01) H01Q 1/10 (2006.01) H01Q 5/00 (2006.01) H03H 7/01 (2006.01) H03H 7/46 (2006.01) H04B 1/18 (2006.01) H04B 7/26 (2006.01)

Patent

CA 1314324

ABSTRACT OF THE DISCLOSURE An antenna element including a loading coil is composed so as to be expanded and contracted like a telescope upward from a housing tube. A characteristic impedance of a transmission line from a lower end part of this antenna element to a cable is equal to one of a cable. A part of the loading coil is reinforced. A branching filter, which is set between the antenna and a communication means using a different frequency band, suppresses a mutual interference between signals of communication means. An antenna circuit, which is set between the antenna or the branching filter and the communication means, converts an impedance of a lower part in a frequency band, and reduces a loss due to a capacitive antenna impedance.

578830

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