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Frequency converter used for a receiver which receives signals of a UHF band or a microwave band
Frequency converter used for a receiver which receives signals of a UHF band or a microwave band
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机译:用于接收UHF频段或微波频段信号的接收机的变频器
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摘要
A frequency converter which is capable of rejecting unnecessary signals generated by image signals. The frequency converter has first and second local oscillation circuits which generate local oscillation signals whose frequencies are the same and whose phases are different by 90 degrees from each other. The converter further includes two mixer circuits, and a hybrid coupler. The mixer circuits generate two unnecessary signals whose phases are different by 90 degrees from each other. The hybrid coupler delays one unnecessary signal by a quarter of a wavelength to generate two unnecessary signals whose phases are different by 180 degrees from each other, so that they are cancelled by each other.
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