Abstract
This paper presents a wideband and low-loss high-temperature superconducting (HTS) bandpass filter (BPF) using a composite right/left-handed (CRLH) stepped-impedance resonator (SIR). The filter resonates at 2.6 GHz for LTE2600 application. The structure is designed in an entirely printed circuit technology based on the CRLH theory and its equivalent circuit. For the same center frequency, fractional bandwidth and stop-band attenuation, the presented CRLH SIR BPF proves to surpass its conventional counterpart in terms of size without degradation in performance. The CRLH SIR BPF is also significantly more controllable in its dimensions and response due to the fact that more elementary parameters are available in the CRLH configuration. The proposed filter is simulated and measured, and the measurement results match well with the simulation results. Good properties of low in-band insertion loss, good out-band rejection, and compact size have been achieved and verified. Intermodulation distortion (IMD) and the transmission properties at different temperatures are used to investigate the nonlinearity of the HTS filter. IMD can also clarify the power-handling capability of the filter.
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