A Tri-Band Bandpass Filter With Wide Stopband Using Asymmetric Stub-Loaded Resonators

作者：Lan Siang Wen^*; Weng Min Hang; Chang Shoou Jinn; Hung Cheng Yuan; Liu Shih Kun

来源：IEEE Microwave and Wireless Components Letters, 2015, 25(1): 19-21.

DOI：10.1109/LMWC.2014.2365739

• Asymmetric stub-loaded resonator (ASLR)
• filter
• resonant analysis
• tri-band

This letter presents a tri-band bandpass filter (BPF) with a wide stopband using asymmetric stub-loaded resonators (ASLR). A tri-band filter sample was fabricated by using two ASLRs with coupled I/O ports. By properly tuning the electrical length ratios of the ASLRs (alpha and gamma), three passbands can be designed at 1.4, 2.4, and 3.5 GHz. The harmonic responses are suppressed effectively by forming an uncoupled section at the end of the ASLRs, and the stopband region is formed from 3.7 to 7 GHz with a rejection level of 30 dB. The measured results of the fabricated tri-band BPF exhibit good agreement with simulated results.

• 出版日期2015-1