volume | PIER Journals

Abstract

An S-band bandpass filter based on quarter wavelength stepped-impedance resonator (SIR) is presented in this paper. Two SIRs are loaded to the BPF to obtain wide stopband suppression. The center frequency f₀ of the bandpass filter is located at 2.105 GHz with 3-dB fraction bandwidth (FBW) of 11.9%. It shows that the spurs free upper stopband with 15 dB rejection level can extend to 40 GHz (19f₀). The circuit size of this filter is extremely compact, which occupies only 7.35 mm × 7.5 mm.

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Dr. Yang Xiong

Dr. Wei Zhang

Dr. Li Tian Wang