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COMPACT DUAL-BAND METAMATERIAL-BASED HYBRID RING COUPLER

  • US 20090289737A1
  • Filed: 05/01/2009
  • Published: 11/26/2009
  • Est. Priority Date: 05/20/2008
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a ring of composite right/left-handed (CRLH) transmission line (TL) material having both right handed (RH) and left handed (LH) characteristics;

    a plurality of lumped elements comprising inductances and capacitances within said LH portions of said CRLH TL; and

    a plurality of ports, including a sum port and a difference port, on said ring separated along a periphery of said ring by either phase delays φ

    1, or phase advances φ

    2, to form a hybrid ring coupler;

    wherein dual frequency characteristics of each segment of said CRLH TL arise in response to an anti-parallel relationship between phase and group velocities below a transition frequency ω

    0, within left handed material (LH) within the CRLH TL, and a parallel relationship between phase and group velocities above transition frequency ω

    0 within the right-handed material (RH) within the CRLH TL;

    said ring is compacted into a compact ring in response to constraining phase delay contributions to |φ

    1|, |φ

    2|≦

    270°

    , and configured to operate in at least two frequency bands comprising a first frequency band f1 and a second frequency band f2.

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