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A compact, high-selectivity, and high-isolation microstrip electronically switchable diplexer is proposed. The diplexer is formed by connecting two switchable dual-band filters to a single feed with multiple coupling paths. No extra matching network is required for this design, which results in a smaller circuit size. In addition, the p-i-n diodes are loaded at one end of the assembled resonators...
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 new compact electronically tunable power divider with high-selectivity bandpass behavior is proposed. Based on the coupled-resonator topology, the size of the proposed divider can be reduced as the size of the assembled resonators shrinks. Besides, through properly varying the dc bias voltages applied to the varactors loaded onto the open-ends of each coupled-resonator, the passband frequency of...
A new compact tunable microstrip diplexer based on varactor-tuned dual-mode stub-loaded resonators is investigated. By using the dual coupling paths, the two channel filters can then be designed independently. In addition, by properly varying the dc bias voltages applied to the varactors loaded onto the dual-mode resonators, the passband frequencies of the diplexer can be changed over a wide tuning...
A new bandpass power divider (PD) with high frequency selectivity and good in-band isolation has been investigated. By introducing parallel-resonant circuits into a multiple-section PD, both bandpass and power dividing properties can be well realized. Besides, the special configuration also provides a good in-band isolation performance. For the demonstration, a microstrip PD with fourth-order bandpass...
A compact, high-selectivity, and high-isolation microstrip quad-channel diplexer has been presented in this paper. By introducing multiple coupling paths between input and output ports, the diplexer design is, therefore, more flexible and can be extended to higher-order multiplexers. In addition, no extra matching network is needed for this design, resulting in a smaller circuit size. For the demonstration,...
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