A miniaturized bandpass filter (BPF) using defected ground structure (DGS) resonator with the characteristic of harmonic rejection is developed in this paper. The second and third harmonics of the proposed BPF are rejected by the characteristic of stepped-impedance DGS resonator. Moreover, open stubs are established so that two adjustable transmission zeros can independently be created to extend the stopband and improve the rejection level. Finally, a second-order BPF, centered at 1.62 GHz with a stopband extended up to 5.6 GHz and a rejection level better than 20 dB, is designed and implemented for GPS application. A good agreement between simulation and measurement verifies the validity of this design methodology.
In this Letter, a dual-band superconducting metamaterial structure with improved performance based on the proposed multimode split ring resonator (SRR) is proposed, which is constructed by two dual-mode SRRs and a high-impedance transmission line component. Also, its properties and equivalent circuit models are investigated by even- and odd-mode analysis. The mechanism producing four transmission zeros is discussed. To verify this design methodology, the dual-band superconducting metamaterial structure is designed and fabricated with a compact size of 10.6 mm × 13.75 mm. The insertion losses at each passband are 0.1 dB and 0.09 dB, respectively. Finally, measured results have a good agreement with simulations.
A miniaturized bandpass filter (BPF) using dual-mode defected ground waveguide (DGW) resonator is developed in this letter. The technique with defected step-impedance shunt stub is applied to enhance the self-inductance and self-capacitance of the DGW loop resonator which leads to size reduction. Compared to the conventional design, the central frequency is reduced by 48%. A good agreement between simulation and measurement verifies the validity of this design methodology.
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