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An embedding cell approach for design of a filter with ultrawide-band rejection and compact size is introduced and investigated. A bandpass filter (BPF) topology design based on the transformed radial stub (TRS) cell embedded resonator (CER) is proposed for the high-performance filter design. The implemented 1.7-GHz BPF with a fractional bandwidth of 1.2% using the TRS CER demonstrates more than 45 dB rejection up to 10.8f0 i.e., 18 GHz. The implemented 1.9-GHz BPF with fractional bandwidth 21% demonstrates 40-dB rejection from 4 to 19 GHz (10f0). The measured passband insertion loss is 2.7 dB, and group delay is around 2.5 nS. The size of the 1.9-GHz fourth-order filter is only 0.408g×0.33 λg, (λg is the guide wavelength at center cutoff frequency) without using any lumped elements.
Components, Packaging and Manufacturing Technology, IEEE Transactions on (Volume:3 , Issue: 9 )
Date of Publication: Sept. 2013