AN APPROACH FOR MULTI-BAND BANDPASS FILTER DESIGN BASED ON ASYMMETRIC HALF-WAVELENGTH RESONATORS

作者：Li, Xiuping^*; Wang, Huisheng

来源：Progress in Electromagnetics Research-PIER, 2013, 140: 31-42.

DOI：10.2528/PIER13031504

• STEPPED-IMPEDANCE RESONATORS
• LOOP RESONATOR
• COMPACT
• SIR
• SUPPRESSION
• FABRICATION

This paper presents that the extra passband with two transmission zeros can be obtained by adding shunt open stubs to the asymmetric half-wavelength resonators structure. By using this method, a fourth or even higher passband with good selectivity and compact size can be obtained. Dual-band, tri-band and quad-band bandpass filters are demonstrated by using this method. The measured bandwidth is 80/180 MHz for the dual-band, 60/180/180 MHz for the tri-band and 130/360/170/70 MHz for the quad-band filter, respectively. The measured insertion loss for the dual-band, tri-band and quad-band filter is less than 2.7 dB, 2.5 dB and 2.9 dB at the center frequency. All the simulated results and the measured results agree well.

• 出版日期2013
• 单位北京邮电大学