【摘 要】
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In this study,a novel self-embedding asymmetric stepped impedance resonator (SE-ASIR) topology is proposed.By embedding asymmetric stepped impedance resonators
【机 构】
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State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University,
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In this study,a novel self-embedding asymmetric stepped impedance resonator (SE-ASIR) topology is proposed.By embedding asymmetric stepped impedance resonators in themselves,circuit sizes of ASIRs can be reduced effectively,while the ability to control spurious modes of ASIRs remains.Therefore,SE-ASIRs are suitable for being used to design filters with wide stopbands and miniaturized sizes.Furthermore,the construction process of the SE-ASIR is described in detail,and an equivalent model of the SE-ASIR is proposed.For demonstration,a high-temperature superconducting bandpass filter centered at 1112 MHz is designed and fabricated.The measured result agrees well with the simulation result and shows that the out-of-band rejection is better than 60 dB up to 4088 MHz,which is about 3.7 times the center frequency.The filter circuit size is 31 mm × 13 mm or 0.28λg × 0.12λg,where λg is the guided wavelength at 1112 MHz.
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