Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1983-03-02
1985-05-07
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455282, 455285, 455311, H04B 110, H04B 126
Patent
active
045162700
ABSTRACT:
The invention is a high frequency hetrodyne receiver front end for receiving a communications signal comprising a desired information frequency and an undesired image frequency. The receiver comprises a bandpass filter, a preamplifier responsive to the bandpass filter, a mixer and a coupler means between the preamplifier and the bandpass filter. The coupler means defines a reactive short at the undesired image frequency due to impedance characteristics of the coupler means. The coupler means thereby eliminates the image frequency noise at the input of the preamplifier. Preferrably the coupler means is a transmission line of a length L where L equals .eta..pi./.beta. and .eta. is an integer and .beta. is proportional to the wavelength of the image frequency.
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Bookbinder Marc E.
Gillman James W.
Motorola Inc.
Roney Edward M.
Southard Donald B.
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