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A new microstrip eight-channel quadruplexer with compact-size and high-isolation is proposed in this paper. The proposed eight-channel quadruplexer is formed by four dual-band bandpass filters (BPFs) based on the quad-mode stub-load resonators. By adjusting the geometric parameters of a single quad-mode stub-load resonator, its first four resonant frequencies can be well controlled and, thus, it can...
A high-isolation and high-rejection microstrip diplexer based on the stub-loaded resonators with independently controllable transmission zeros has been presented. The transmission zero is an inherent characteristic of the stub-loaded resonator. By allocating properly these transmission zeros at the specific frequencies, the output isolation and out-of-band rejection of the diplexer can thus be improved...
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