Multi-band antenna structure for a portable radio

Details Multi-band antenna structure for a portable radio Multi-band antenna structure for a portable radio

1997-02-19

1999-08-31

Le, Hoanganh

Communications: radio wave antennas

Antennas

Spiral or helical type

343702, H01Q 136, H01Q 124

Patent

active

059459646

ABSTRACT:
A first coil (110) resonant at a first frequency, and a second coil (120) resonant at a second frequency, coupled to a conductive straight portion (140) of an antenna element (130) to form a multi-band antenna structure. The first and second coils (110) and (120) are preferably of different axial lengths and circumferences, wound in opposite directions and coaxially disposed about the antenna element (130). Additional coils can be added to accommodate additional bands and an upper coils (150) can be used to realize a multi-position structure.

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