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WIDEBAND IMAGE TERMINATED MIXER

  • US 3,681,697 A
  • Filed: 12/31/1969
  • Issued: 08/01/1972
  • Est. Priority Date: 12/31/1969
  • Status: Expired due to Term
First Claim
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1. A wideband image enhancement mixer system comprising, microwave coupling means having at least three ports, one of said ports of said coupling means serving as an input signal port and two of said ports serving as output signal ports for dividing an incoming signal between two signal paths, microwave transmission lines connecting said two output ports, respectively, with two balanced mixers, a local oscillator, a first 90* hybrid coupler having one of its ports connected to the output of said oscillator and having two ports serving as outputs connected respectively, to each of said mixers and a fourth port connected to a matched load impedance, a second 90* hybrid microwave junction having two ports connected, respectively, to the outputs of said mixers and two other ports, one of which is connected to a matched load and the other of which constitutes a signal output, whereby the resultant intermediate frequency signals at the outputs of said mixers are combined and the image frequency signals returning from said mixers are summed image termination and reflected back to said mixers to convert at least a portion of the image frequency signal energy to intermediate frequency energy.

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