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Down-converter Having Matching Circuits with Tuning Mechanism Coupled to 90-Degree Hybrid Coupler Included Therein

  • US 20090146765A1
  • Filed: 05/23/2008
  • Published: 06/11/2009
  • Est. Priority Date: 12/10/2007
  • Status: Abandoned Application
First Claim
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1. A down-converter, comprising:

  • two low-noise amplifiers, for respectively amplifying a first beacon signal and a second beacon signal to generate a first amplified signal and a second amplified signal;

    a 90-degree hybrid coupler, for transforming the first amplified signal and the second amplified signal into a first coupler output signal and a second coupler output signal, the 90-degree hybrid coupler comprising;

    two input ports, for respectively receiving the first amplified signal and the second amplified signal; and

    two output ports, for respectively outputting the first coupler output signal and the second coupler output signal;

    two first matching circuits, respectively coupled to the 90-degree hybrid coupler, each first matching circuit having a first tuning mechanism disposed in one side of the first matching circuit and not contacting the first matching circuit, wherein the first tuning mechanism is used for adjusting characteristics of the first matching circuit; and

    a down-converting circuit, for down-converting the first coupler output signal and the second coupler output signal.

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