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Radio receiver isolation system

  • US 4,051,475 A
  • Filed: 07/21/1976
  • Issued: 09/27/1977
  • Est. Priority Date: 07/21/1976
  • Status: Expired due to Term
First Claim
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1. A system for permitting simultaneous transmission and reception of two colocated transceivers operating on different frequencies without mutual interference therebetween, comprising in combination:

  • a single hybrid transformer having a sum port, a difference port, and first and second conjugate ports;

    means continuously coupling one of said two transceivers operating at a first frequency to said sum port;

    means continuously coupling the other of said two transceivers operating at a second frequency to said difference port;

    antenna means coupled to said first conjugate port and having first and second predetermined operating impedance characteristics dependent upon the different predetermined operating frequency of each of said two tranceivers; and

    electrical load impedance means continuously coupled to said second conjugate port and being operative to substantially simulate said first and second operating impedance characteristics of said antenna means at both of said frequencies simultaneously whereby power coupld to said sum and difference ports at each of said operating frequencies is substantially equally divided between said antenna means and said electrical load impedance means coupled to said two conjugate ports.

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