Apparatus and method for isolating in-channel FM antennas...

Details Apparatus and method for isolating in-channel FM antennas... Apparatus and method for isolating in-channel FM antennas...

2005-07-05

2005-07-05

A, Minh (Department: 2821)

Communications: radio wave antennas

Antennas

With support for antenna, reflector or director

Reexamination Certificate

active

06914579

ABSTRACT:
Each of a pair of antennas for broadcasting has multiple elements arranged vertically on the same tower. The antennas transmit circularly polarized signals of opposite polarization. The opposite circular polarization of the radiated signals increases their mutual isolation and permits broadcast of conventional FM-band signals and digital FM at the same frequency. The polarization technique allows the elements of the two antennas to share an aperture without degradation of function.

REFERENCES:
patent: 5774193 (1998-06-01), Vaughan
patent: 5949793 (1999-09-01), Bossard et al.
patent: 6137448 (2000-10-01), Schadler
patent: 6422900 (2002-07-01), Hogan
patent: 6608592 (2003-08-01), McReynolds
patent: 6677916 (2004-01-01), Skalina et al.
patent: 2002/0187759 (2002-12-01), Stenberg
patent: 2004/0008150 (2004-01-01), Harland et al.

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