Unbalanced antenna system

Details Unbalanced antenna system Unbalanced antenna system

1997-09-11

1999-06-22

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With electrical shield

343702, 343846, 343851, H01Q 148

Patent

active

059146966

ABSTRACT:
An antenna system (20) provides low radio frequency interference (RFI) using an unbalanced antenna (21) comprised of three eighths wavelength whip antenna element (22) and associated counterpoise (23). Antenna counterpoise (23) may be formed by an EMI shielding conductor which is isolated at the frequency of operation of antenna system (20) from EMI shielding serving as host interface ground conductor (28) using resonant structure (25). Resonant structure (25) isolates antenna counterpoise (23) from host interface ground conductor (28) thereby improving antenna efficiency, and substantially eliminating RFI effects arising from use of antenna system (20).

REFERENCES:
patent: 2920323 (1960-01-01), Dunson
patent: 3541556 (1970-11-01), Cheillan
patent: 5184143 (1993-02-01), Marko
patent: 5420599 (1995-05-01), Erkocevic
The ARRL Handbook for the Radio Amateur, Published by the American Radio Relay League, 66th ed., pp. 2-22 to 2-29, Fig. 46, 1989.
IBM Technical Disclosure Bulletin, vol. 37, No. 06A, Jun. 1994, p. 483, PCMCIA Cellular/Radio Antenna.

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