科研之友
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摘要
A configuration of wideband bandpass filter (BPF) with multiple notched bands is presented. Proposed BPF is based on stepped-impedance resonator. By utilising dual stepped-impedance resonators in folded topology a rectangular-ring resonator is formed. Two notched bands in the passband are achieved without using asymmetrical coupled lines. In other words, the filter configuration is capable of producing notched bands. It should be noted that additional information on filter performance and design is presented. Measurement results are presented to approve propounded filter characteristics. The measured passband of the second proposed filter is from 3.68 to 10.2GHz with insertion loss of -1.76dB in the first passband at the centre frequency of 4.45GHz. The measured notched band frequencies are about 5.45 and 7.95GHz with rejection of -21.77 and -20.82dB, respectively. The return loss in the passband is better than -11.4dB.
- 出版日期2014-7-3
