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High isolation signal routing assembly for full duplex communication

  • US 20090268642A1
  • Filed: 06/29/2009
  • Published: 10/29/2009
  • Est. Priority Date: 12/29/2006
  • Status: Active Grant
First Claim
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1. An electromagnetic signal routing assembly for effecting two way duplex transmissions, comprising:

  • a transmission signal input for receiving first transmission signal;

    a common port for outputting a substantial portion of said first transmission signal from said transmission signal input and simultaneously receiving a second transmission signal;

    a transmission signal output for outputting a portion of said second transmission signal;

    a signal divider receiving said first transmission signal from said transmission signal input and dividing said first transmission signal into first and second divided transmission signals having substantially equal amplitudes and a first relative phase shift therebetween;

    first and second routing devices each having at least first, second and third ports, said first and second routing devices being configured to simultaneously deliver a signal at said first port to said second port and another signal at said second port to said third port each at functionally operative levels, wherein;

    s21 is a transmission coefficient from said first port to said second port;

    s32 is a transmission coefficient from said second port to said third;

    s31 is a transmission coefficient from said first port to said third port;

    said s21 is greater than said s31; and

    said s32 is greater than said s31;

    said first routing device having said first divided transmission signal applied to said first port of said first routing device and simultaneously producing;

    a first divided transmission output signal at said second port of said first routing device; and

    a first transmission leakage signal at said third port of said first routing device;

    said first routing device also having a third divided transmission signal, when present, applied to said second port of said first routing device and producing, simultaneously with said first divided transmission output signal and said first transmission leakage signal, a third divided transmission output signal at said third port of said first routing device;

    said second routing device having said second divided transmission signal applied to said first port of said second routing device and simultaneously producing;

    a second divided transmission output signal at said second port of said second routing device; and

    a second transmission leakage signal at said third port of said second routing device;

    said second routing device also having a fourth divided transmission signal, when present, applied to said second port of said second routing device and producing, simultaneously with said second divided transmission output signal and said second transmission leakage signal, a fourth divided transmission output signal at said third port of said second routing device;

    a signal divider/combiner having;

    first and second divider/combiner ports for receiving said first and second divided transmission output signals and a configuration for combining these signals using a second relative phase shift therebetween to output a substantial portion of said first transmission signal to said common port; and

    said second transmission signal, when present and received at said common port, and said signal divider/combiner having said configuration arranged for dividing said second transmission signal into said third and fourth divided transmission signals having substantially equal amplitudes and a second relative phase shift therebetween; and

    a signal combiner having first and second combiner inputs for receiving said first and second transmission leakage signals and, when present, for receiving said third and fourth divided transmission output signals, and said signal combiner being configured to introduce a third relative phase shift into signals applied to at least one of said first and second combiner inputs such that;

    said first and second transmission leakage signals have approximately 180 degrees relative phase difference and are at amplitude levels within such a range to effect substantial cancellation of said first and second transmission leakage signals at said transmission signal output; and

    said third and fourth divided transmission signals, when present, have approximately 0 degrees relative phase difference and are at amplitude levels within such a range to effect substantial combination of said third and fourth divided transmission signals to output a portion of said second transmission signal at transmission signal output.

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