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Miniature high selectivity filters using grounded spiral resonators

Miniature high selectivity filters using grounded spiral resonators

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A novel miniature high selectivity filter designed using a metamaterial resonator based on four grounded spirals (ForeS) is presented. This enables extreme size reduction together with high out-of-band rejection and low insertion loss. A fabricated third-order filter has overall dimensions of λg/4 by λg/15, a 3 dB bandwidth of 3.7% at 1.63 GHz, insertion loss of −3 dB, attenuation greater than 75 dB in the lower stopband and greater than 40 dB up to 2.6 times the centre frequency.


    1. 1)
      • Jokanovic, B., Crnojevic-Bengin, V.: `Miniaturization of left-handed resonators based on grounded spirals', Proc. of Conf. TELSIKS, Serbia, 2007, September 2007, p. 293–296.
    2. 2)
      • Jokanovic, B., Crnojevic-Bengin, V.: `Super-compact left-handed resonator for filter applications', 2007 European Microwave Conf., October 2007, Munich, Germany, p. 716–719.
    3. 3)
    4. 4)
      • J.-S. Hong , M.J. Lancaster . Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies. IEEE Trans. Microw. Theory Tech. , 7 , 1098 - 1107
    5. 5)

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