Multi-stage antenna

Details Multi-stage antenna Multi-stage antenna

1994-11-25

1996-04-02

Hajec, Donald T.

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343900, 343901, H01Q 110

Patent

active

055044948

ABSTRACT:
An antenna system (202) provides communication capabilities in both extended and retracted positions. Antenna system (202) includes a base helical (214) that capacitively couples to a half wavelength radiator (222) in the extended position. Base helical (214) capacitively couples to a top helical (228) in the retracted position, thereby reducing case currents on the surface of the housing (206).

REFERENCES:
patent: 4725845 (1988-02-01), Phillips
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5343213 (1994-08-01), Kottke et al.
patent: 5353036 (1994-10-01), Baldry
patent: 5426440 (1995-06-01), Shimada et al.
patent: 5434582 (1995-07-01), Koike et al.
patent: 5438339 (1995-08-01), Itoh et al.

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