Radio apparatus

Details Radio apparatus Radio apparatus

1999-03-24

2000-08-15

Wong, Don

Communications: radio wave antennas

Antennas

High frequency type loops

343748, 343866, H01Q 1112

Patent

active

061043540

ABSTRACT:
A small radio apparatus such as a pager has a printed circuit loop antenna(12) comprising a generally elongate loop formed by first and second electrical conductors(22,24) interconnected by first and second electrically conductive end portions(18,20). A fixed value high Q capacitance(26) is incorporated into the first end portion(18) and a variable capacitance(30) is incorporated in a tap(28) interconnecting the first and second conductors(22,24) adjacent to, but spaced from, the second end portion(20). The loop antenna may be fabricated from low loss material or may comprise a track or back-to-back tracks on a dielectric substrate. The loop antenna(12) may be connected directly to RF circuitry or may be coupled inductively to the RF circuitry.

REFERENCES:
patent: 5113196 (1992-05-01), Ponce De Leon et al.
patent: 5422650 (1995-06-01), Hill
patent: 5469180 (1995-11-01), Wiggenhorn
patent: 5673054 (1997-09-01), Hama
patent: 5973650 (1999-10-01), Nakanishi
patent: 5995054 (1999-11-01), Massey
patent: 6028559 (2000-02-01), Satoh et al.

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