Crossed-dipole antenna for low-loss IBOC transmission from a common radiator apparatus and method
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United States of America Patent
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May 4, 2010
Grant Date -
Nov 27, 2008
app pub date -
May 24, 2007
filing date -
May 24, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dual-port corporate-feed broadband antenna uses two pairs of crossed dipoles in each bay, fed by a single hybrid coupler in each bay, to support hybrid-mode IBOC® VHF-band broadcasting. Each 3 dB quarter-wave coupler receives a share of an analog FM broadcast signal on a first input and a digital OFDM broadcast signal, 20 dB down, on a second input. The respective coupler output ports drive coaxial lines to tees feeding respective quarter-wave-separated crossed dipoles. The dipoles in each bay are arranged in a square to one side of their coupler, making side mounting practical. The resultant omnidirectional analog and digital radiation patterns have the same circular polarization and opposite phase rotation. Bay spacing for vertical null is a function ((n−1)/n) of the number of bays in the antenna.
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