Abstract
In this paper, a novel high temperature superconducting (HTS) dual composite right/left-handed (D-CRLH) resonator is proposed, which is constructed by microstrip spiral coupled lines and microstrip high-impedance lines. Moreover, by using an equivalent circuit model and a admittance matrix method, the characteristics of the D-CRLH resonator is obtained and analyzed, which makes it suitable for implementing the miniaturized high-performance filter. For demonstration, a second-order D-CRLH bandpass filter is designed on a 0.5-mm-thick MgO wafer with double sided YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> films. Multitransmission zeros are obtained in the stopband of the filter, improving the selectivity and stopband characteristics of the filter. Good agreement between the measurements and design goals can be observed.
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