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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2026-09-11
A Compact Multilayer Quad-Band Bandpass Filter with Coupled SIRs for Multi-Standard Wireless Systems
By
Hassan Saad Abdullah,

    Mr. Hassan Saad Abdullah

    Department of Electrical Engineering

    University of Technology - Iraq

    Iraq

    Homepage

Raaed Thaaban Hammed

    Dr. Raaed Thaaban Hammed

    Department of Electrical Engineering

    University of Technology - Iraq

    Iraq

    Homepage

Progress In Electromagnetics Research C, Vol. 173, 207-214, 2026
doi:10.2528/PIERC26071407 | Google Scholar

Abstract
In this paper, we propose a compact quad-band bandpass filter by using short-ended stepped-impedance resonators (SE-SIRs) and open-ended stepped-impedance resonators (OE-SIRs) in a hybrid structure. The proposed design uses the odd- and even-mode resonances of the two types of resonators to produce four independent passbands in a compact multilayer structure. The first and second passbands are set by SE-SIR resonators at 1.56 and 2.5\,GHz, respectively. The third and fourth passbands are centered at 3.5 and 5.2\,GHz, respectively, due to the OE-SIR resonators. To achieve the quad-band response in a compact size, a multilayer arrangement with electromagnetic broadside coupling between the feeding structure and resonators has been adopted. Finally, the filter is designed, simulated, fabricated, and measured using a Rogers-Ceramic RO4360 substrate with a permittivity of εr = 6.15 and thicknesses of (h1 = 0.3, h2 = 0.508) mm. Simulated insertion losses were 0.29, 0.26, 0.43, and 0.66 dB, and return losses were 28.65, 15.05, 14.04, and 17.3 dB in each of the four operating bands, respectively. Filter responses from simulation and measurement are contrasted and discussed. The produced filter is very small, covering a circuit area of about 129 mm2, without feeding ports.
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Citation
Hassan Saad Abdullah, and Raaed Thaaban Hammed, "A Compact Multilayer Quad-Band Bandpass Filter with Coupled SIRs for Multi-Standard Wireless Systems," Progress In Electromagnetics Research C, Vol. 173, 207-214, 2026.
doi:10.2528/PIERC26071407
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