Invention Grant
US07710342B2 Crossed-dipole antenna for low-loss IBOC transmission from a common radiator apparatus and method 失效
用于低通量IBOC传输的交叉偶极子天线用于通用散热器装置和方法

Crossed-dipole antenna for low-loss IBOC transmission from a common radiator apparatus and method
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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