A Multilayered Parallel Coupled Microstrip Bandpass Filter With Embedded SIR Cells to Have a Broad Upper Rejection Band

作者：Kuan Hon^*; Lin Yueh Ling; Yang Ru Yuan; Chang Yu Chi

来源：IEEE Microwave and Wireless Components Letters, 2010, 20(1): 25-27.

DOI：10.1109/LMWC.2009.2035957

• Bandpass filter (BPF)
• spurious
• stepped impedance resonator (SIR)
• suppression

This paper proposes a parallel coupled microstrip bandpass filter (BPF) with folded stepped impedance resonator (SIR) cells on the middle layer for spurious suppression. The folded SIR cells on the middle layer create a wide stopband by canceling the second and third harmonics of the parallel coupled microstrip BPF with suppression of over -50 and -30 dB, respectively. By selecting properly the impedance ratio (R) and physical length ratio (alpha) of the folded SIRs, the parallel coupled BPF with a wide stopband can be implemented without causing a package problem of degrading the complete ground plane. The proposed BPF is designed and fabricated. Good agreement between the electromagnetic (EM) simulation and measurement is obtained.

• 出版日期2010-1