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Antenna with embedded wideband matching substrate

  • US 9,887,462 B2
  • Filed: 10/31/2013
  • Issued: 02/06/2018
  • Est. Priority Date: 10/31/2013
  • Status: Active Grant
First Claim
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1. An impedance matching structure for an antenna radiator element, comprising:

  • a printed circuit board (PCB) having no dedicated ground layer;

    a radio frequency (RF) input coupled to a microstrip disposed on the PCB;

    a diplexed matching circuit located after the microstrip comprising;

    a low frequency (LF) matching circuit, formed of a low pass filter providing a low frequency path, disposed on the PCB;

    a high frequency (HF) matching circuit, formed of a high pass filter providing a high frequency path, disposed on the PCB;

    wherein current fed through the RF input continues through the microstrip and then splits after the microstrip into two paths into the LF and HF matching circuits;

    a RF stripline embedded within a stripline ground within the PCB between the microstrip and the HF matching circuit as part of the high frequency path of the diplexed matching circuit, the embedded RF stripline providing matching and a common ground for both the HF and LF matching circuits, the matching and common ground provided by the embedded RF stripline providing a return current path for both the HF and LF matching circuits; and

    an antenna feed point for coupling to the antenna radiator element, the antenna feed point disposed on the PCB at an output joining outputs of the LF matching circuit and the HF matching circuit.

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