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Filter Design Methods and Filters Based on Metamaterial Structures

  • US 20090160578A1
  • Filed: 11/17/2008
  • Published: 06/25/2009
  • Est. Priority Date: 11/16/2007
  • Status: Active Grant
First Claim
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1. A metamaterial structure based filter apparatus, comprising:

  • an extended composite left and right handed (E-CRLH) metamaterial unit cell comprising;

    a series inductor LR and a series capacitance CL that in combination produce a series resonance ω

    SE,a shunt inductor LL and a shunt capacitance CR that in combination produce a shunt resonance ω

    SH,a series inductor LR′ and

    a series capacitance CL′

    that in combination produce a series resonance ω

    SE′

    , anda shunt inductor LL′ and

    a shunt capacitance CR′

    that in combination produce a shunt resonance ω

    SH′

    ,wherein the series inductor LR, the series capacitance CL, the shunt inductor LL, the shunt capacitance CR, the series inductor LR′

    , the series capacitance CL′

    , the shunt inductor LL′ and

    the shunt capacitance CR′

    are (1) connected to form a symmetric cell structure for the E-CRLH unit cell where an input and an output of the E-CRLH unit cell have a common circuit structure, and (2) to have values that render ω

    SE and ω

    SH′

    to be substantially equal, and ω

    SH and ω

    SE′

    to be substantially equal.

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