Compact Dual-Layer Bandpass Filter Using Novel Stepped-Impedance Resonators

Gan, Decheng; He, Shiyuan; Sun, Man; Wei, Xiantao; Tang, Wei; Yu, Suzhu

doi:10.1080/02726343.2016.1115405

Cited by 1 publication

(2 citation statements)

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“…Thereafter, only the odd mode has been considered to analyze the equivalent circuit and to deduce its resonant mode. By exciting odd-mode equivalent circuit from the perfect electric wall, the input impedance Z ino is deduced as [1]: Inspecting Fig. 1(c), the loop part of the circuit consists of lower and upper sections that are composed of θ 2 and θ 3 , respectively.…”

Section: Design Proceduresmentioning

confidence: 99%

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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: Design Proceduresmentioning

confidence: 99%

“…In modern wireless and mobile communication systems, filters are always playing important and essential roles. To be suitable for application in modern communication systems, planar filters with compact size, high performance, and low cost are highly demanded [1]. Recently several microstrip bandpass filters (BPFs) have been reported.…”

Section: Introductionmentioning

confidence: 99%