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2024-08-24
A Planar Quad-Band Bandpass Filter Employing Transmission Lines Loaded with Tri-Stepped Impedance Open- and Dual-Stepped Impedance Short-Ended Resonators
By
Progress In Electromagnetics Research C, Vol. 147, 65-72, 2024
Abstract
A highly miniaturized bandpass filter with quad-band response is demonstrated in this article. The proposed quad-band bandpass filter has a novel topology comprising series quarter wavelength transmission lines loaded with tri stepped impedance open-ended resonators and a dual stepped impedance short-ended resonator. The proposed quad-band bandpass filter configuration is validated by theoretically verifying the transmission zeros and poles frequencies using even-odd mode analysis. A prototype operating at 0.47 GHz, 1.68 GHz, 3.47 GHz, and 4.51 GHz is designed, implemented, and experimented. The tested insertion losses at these center frequencies are 0.38 dB, 0.71 dB, 1.03 dB, and 1.22 dB, and the return loss is better than 10 dB in each passband. Each passband is isolated by a transmission zero with a rejection better than 40 dB. The proposed quad-band filter occupies a compact size of 0.146 × 0.087λg2 and is distinguished by its high compactness, wide bandwidth, multiple transmission zeros and poles, and high performance compared to benchmark designs making it more suitable for multi-band wireless applications.
Citation
Kamran Arif, Kanaparthi V. Phani Kumar, Rusan Kumar Barik, and Geetha Chakaravarthi, "A Planar Quad-Band Bandpass Filter Employing Transmission Lines Loaded with Tri-Stepped Impedance Open- and Dual-Stepped Impedance Short-Ended Resonators," Progress In Electromagnetics Research C, Vol. 147, 65-72, 2024.
doi:10.2528/PIERC24042504
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