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چکیده
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This paper presents a compact and scalable microstrip diplexer platform capable of realizing 2-, 4-, 6-, and 8-channel operation based on a shared multi-resonator topology. The design is built upon a comb-like loaded open-loop (CLOL) resonator combined with a stub-loaded ring (SLR) resonator to achieve high selectivity and low insertion loss. An equivalent LC model is developed to provide physical insight into the resonant behavior and to guide parameter tuning through impedance analysis and sensitivity studies. The proposed architecture is experimentally validated through several prototypes. The dual-, four-, six-, and eight-channel diplexers cover operating frequencies from 3.6 to 5.5 GHz. As a representative example, the eight-channel diplexer provides passbands at 3.60, 3.85, 4.09, 4.25, 4.51, 4.60, 4.73, and 5.49 GHz, with measured insertion losses between 0.335 dB and 1.116 dB, return losses of 15–30.4 dB, and inter-port isolation better than 20 dB within a footprint of 22.6 . The results confirm that channel scalability can be achieved without significant penalty in insertion loss, matching, or circuit size. Given their operating range and compact size, the proposed diplexers are suitable for sub-6-GHz multiband wireless communication systems, including 5G applications.
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