Abstract

A compact and high isolation microstrip six-channel diplexer has been proposed. The diplexer is formed by connecting two tri-band bandpass filters (BPFs) to a single feed with multiple coupling paths. By using the distributed coupling technique, the input matching circuit is not needed anymore, resulting in a smaller circuit size. In addition, by employing the multi-mode stepped-impedance resonators (SIRs), a diplexer with compact size and flexible frequency allocation can be implemented. For a demonstration, a six-channel diplexer with third-order Chybeshev bandpass response is designed and fabricated using microstrip technology. The size of the fabricated diplexer is only about $\pmb{0.69 \lambda_{\text{g}}\times 0.21\lambda_{\text{g}}}$ . Moreover, the isolation between the output channels is larger than 35 dB.

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