Antenna system and method to transmit cross-polarized...

Details Antenna system and method to transmit cross-polarized... Antenna system and method to transmit cross-polarized...

2007-01-26

2010-11-23

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

With support for antenna, reflector or director

C343S742000, C343S797000

Reexamination Certificate

active

07839351

ABSTRACT:
A dual-port IBOC® antenna provides omnidirectional radiation of orthogonal, circularly polarized analog (FM) and digital (OFDM) signals using quadruple coplanar square loops driven from a hybrid having balanced outputs. The loops are arranged in a tiled square, with proximal sides functioning as further stripline hybrids to cancel cross coupling between the loops. Each loop quad is reflector-backed and emits a directional signal; multiple loop quads oriented radially form an omni bay. Vertical spacing between bays includes a minimum position for mutual coupling, while symmetry establishes uniform input impedance on the hybrid input ports. Tuning barbs on the loops fine tune frequency response. Bandwidth is wide, so that a single antenna can radiate multiple FM analog and hybrid IBOC® channels over the VHF FM radio broadcast band.

REFERENCES:
patent: 4184163 (1980-01-01), Woodward
patent: 4510501 (1985-04-01), Woodward et al.
patent: 5751252 (1998-05-01), Phillips
patent: 5929820 (1999-07-01), Caulfield et al.
patent: 6823177 (2004-11-01), Lucidarme
patent: 6934514 (2005-08-01), Stenberg
patent: 7292195 (2007-11-01), Phillips et al.

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