The quad-channel diplexer achieves four passbands at varied frequencies, suggesting enhanced isolation.
A quad-channel diplexer is designed in this paper. The diplexer is composed of four stub-loaded step impedance resonators and a common feeder T-joint, which realizes four passbands with center frequencies of 2.6 GHz, 3.48 GHz, 4.8 GHz, and 6.3 GHz. The dual-band filter can be formed by coupling the stepped impedance resonator with the stub load, so two dual-band filters with good performance can be constructed. At the input and output end, a 0-degree feed is used to generate transmission zeros, which improves the high selectivity. When two dual-band filters are combined, a good impedance matching is obtained, and the |S23| > 20 dB between the two dual-band filters achieves good isolation. The simulation results are consistent with the measured results.
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Liu et al. (2025) studied this question.
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