A Novel Quad-Band Bandpass Filter Using Short Stub Loaded E-Shaped Resonators

作者：Yan, Tengfei^*; Tang, Xiao-Hong; Wang, Junfeng

来源：IEEE Microwave and Wireless Components Letters, 2015, 25(8): 508-510.

DOI：10.1109/LMWC.2015.2440655

• Dual mode resonator
• quad-band bandpass filter
• short stub loaded E-type resonator
• source-load coupling

In this letter, a novel quad-band bandpass filter (BPF) using short stub loaded E-Type resonators is proposed. Two sets of resonators are utilized and respectively designed to realize Filter 1, operating at 2.4 and 3.5 GHz, and Filter 2 with two very closely spaced passbands, operating at 5.2 and 5.8 GHz. Then the two dual-band BPFs are combined by common feed lines with inter-digital capacitance structure for quad-band responses, and two more transmission zeros (TZs) are achieved by strengthening the source-load coupling. The measured result of the fabricated filter agrees well with the simulation, which shows that the proposed structure is a good candidate for quad-band BPF designs and validates the proposed design flow well.

• 出版日期2015-8
• 单位中国科学院电工研究所; 电子科技大学