A compact open-loop resonator filter with a wide stopband response

Jantree, Jaruek; Akkaraekthalin, Prayoot

doi:10.1016/j.aeue.2006.04.008

Cited by 2 publications

(1 citation statement)

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“…Mezaal and Ali [3] describe a BPF using stepped impedance resonator (SIR) in order to isolate the second harmonic frequency in output frequency response of the filter. In [4], it is noted that by using a cross-coupled structure, and a 0° feed structure (which has a 0° difference between the electric delays of the lower and upper paths), two transmission zeros in the stopband can be generated to improve the selectivity of the filter. However, these resonators have a large size and still exhibit harmonic responses.…”

Section: Introductionmentioning

confidence: 99%

Compact microstrip bandpass filter using dual closed-loop stepped impedance resonator

Dembele

Zhang

Bao

et al. 2018

Int. J. Microw. Wireless Technol.

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A dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidth (FBW) are easily tuned by changing the physical dimensions of the resonator. Three transmission zeros are generated to improve the performance in the upper stopband. A DCLSIR prototype BPF is fabricated with a center frequency of 9.3 GHz, and evaluated to validate the design concept. The measured FBW is 9.25%, the insertion loss is 1.58 dB, and the return loss is over 17 dB. The measurement results agree well with the simulation results.

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Section: Introductionmentioning

confidence: 99%