Coupling topologies for realizing compact microwave diplexers with dual-mode cavities

Abstract

International audienceIn this work, two topologies for realizing compact microwave diplexers in dual-mode cavities are presented. The first topology is a classical one, where the common port is coupled to two resonators in separate paths. The second topology is original because of the excitation of a single resonator by the common port. The interest of the second topology is demonstrated on dual-mode cavity diplexers by eliminating spurious cross-polarized modes which appear when using a classical topology. The proposed topologies have been validated by the design of coupled dual-mode cavity diplexers for satellite applications

Design and implementation of compact diplexers using dual-mode cavities

“…Compared with the design proposed in Ref. , a coupling screw has been placed in the center cavity for controlling the null coupling between resonators 5 and 6. Moreover, to avoid deep penetration of the screws into the cavity and to keep symmetry in the center cavity, we used diametrically opposed screws.…”

“…Compact microwave multiplexers are networks composed exclusively of coupled resonators, which can be used for implementing multiplexers with a reduced number of channels. The coupled resonator network allows size and weight reduction because of the waveguide elements' suppression, but also offer additional design flexibility since coupling between channels is also possible .…”

“…Compared with our previous work , new designs are provided and the design procedure is improved, leading to a more robust implementation of compact diplexers with dual‐mode cavities. Moreover, the current study provides a comparison between compact diplexers and a manifold diplexer in terms of compactness and electrical performances (including power handling), and the two topologies of compact diplexers are characterized through prototype measurements.…”

A compact diplexer with a split-ring resonator junction

“…6 This resulted in new diplexer topologies [7][8][9] and reduction in circuit size. 10,11 A diplexer with a resonant junction tends to be more compact in size because the resonant junction stands as a resonating pole for each channel filer as well as a signal splitter and combiner. The transmission-line based signal-distribution network is no longer required.…”

“…[5][6][7] A typical antenna with simple single feed configurations is limited because of narrow AR bandwidth, within the range of 1%. 10,11 Several methods are proposed to alleviate this problem, including utilization of coplanar waveguide (CPW) feed, 8,[12][13][14] additional slots, 14 coupling strip, 15,16 thickening of the substrate, 9 and fractal patches. [17][18][19] A CPW-fed square slot antenna is introduced in Ref.…”