M-type antenna for vehicles

Details M-type antenna for vehicles M-type antenna for vehicles

1993-07-30

1995-10-10

Hajec, Donald

Communications: radio wave antennas

Antennas

Fractional, multiple, or full wave length linear type

343830, 343713, H01Q 930

Patent

active

054574706

ABSTRACT:
An M-type car antenna for traffic information communication systems including an antenna element having a length which is one-half of the wavelength of the radio way used in the information communication systems, and a connector which is connected via an electrostatic coupling to the center-of the antenna element, the impedance matching and feeding being carried out by the connector. In this antenna, the voltage polarity of the connector at the coupling point and that of the center of the antenna element are set to be opposite from each other, and the electric current in the antenna element and that in the connector are set to be in the same direction. Thus, the M-type antenna is compact and easy to manufacture with stable antenna characteristics.

REFERENCES:
patent: 4611214 (1986-09-01), Campbell et al.
patent: 4931806 (1990-06-01), Wunderlich
patent: 5291210 (1994-03-01), Nakase

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