Non-grounded type ultrahigh frequency antenna

Details Non-grounded type ultrahigh frequency antenna Non-grounded type ultrahigh frequency antenna

1989-04-24

1990-05-29

Hille, Rolf

Communications: radio wave antennas

Antennas

With vehicle

343846, 343829, H01Q 132, H01Q 938

Patent

active

049299611

ABSTRACT:
A non-grounded type ultrahigh frequency antenna including an antenna element having a length of .lambda./2 at a working frequency, a casing provided at the base of the antenna element, a metal section of the casing having a length of approximately .lambda./4 at the working frequency, and a metal plate provided in the casing and parallel to the metal section, one end of the metal plate being connected to the metal section and other end to the antenna element. The antanna is made parallel-resonant within a working frequency band by an electrostatic capacitance created between the metal plate and metal section and an inductance of the metal plate. The antenna element can be made slightly shorter than a length .lambda./2 at the working frequency and another metal plate can be provided between the antenna element and the metal plate so that a constant K-filter is formed by an electrostatic capacitance created by the another metal plate and the metal plate and a residual inductance of the antenna element.

REFERENCES:
patent: 4342037 (1982-07-01), Dalby
patent: 4644361 (1987-02-01), Yokoyama
patent: 4658266 (1987-04-01), Doty, Jr.

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