Folded spiral antenna for a portable radio transceiver and metho

Details Folded spiral antenna for a portable radio transceiver and metho Folded spiral antenna for a portable radio transceiver and metho

1998-03-09

1999-07-27

Le, Hoanganh

Communications: radio wave antennas

Antennas

Spiral or helical type

343866, H01Q 136

Patent

active

059298251

ABSTRACT:
A spiral antenna (100) having a feed-point end and a termination end for use within a portable two-way radio housing includes a ground substrate (102) and a number of spiral elements (103, 105) having a number of segments that form two or more spiral shapes. A shorting stub (107) connects the planar elements at a termination end for effectively increasing the feed-point impedance of the spiral antenna (100). The spiral elements (103, 105) may be positioned in a planar arrangement (FIGS. 1 and 2) or may be stacked in separate planes (FIGS. 3 and 4) for forming a limited space antenna having a substantially 50 ohm feed-point end impedance at resonance.

REFERENCES:
patent: 4658262 (1987-04-01), DuHamel
patent: 5313216 (1994-05-01), Wang et al.
patent: 5583523 (1996-12-01), Wallace, Jr.

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