Microstrip diplexers design with common resonator sections for compact size, but high isolation

Microwave Diplexer Purely Based on Direct Synchronous and Asynchronous Coupling

“…Uses an external / additional resonator [16][17][18][19] for energy distribution between the transmit and receive channels…”

“…This connecting device could be a T-junction [1][2][3][4][5], a Y-junction [6][7][8], a circulator [9][10][11], a manifold [12][13][14][15] and recently, a common resonator [16][17][18][19]. The external junctions utilized in the conventional approach to diplexer design had resulted in more complex and larger size diplexer devices.…”

Miniaturized Substrate Integrated Waveguide Diplexer Using Open Complementary Split Ring Resonators

“…This component provides a high bandisolation between two different output ports to avoid interference between each other. In order to achieve a few desired specifications for a high-performance diplexer in terms of low insertion losses, strong channel rejection and high isolation, this device can be realized by different filter configurations [5][6][7][8][9][10]. The SIW structures are suitable to realize essential filter elements of the diplexers because of the advantage of these structures.…”

High isolation and common-mode suppression balanced-to-balanced microstrip diplexer with mixed coupling

“…The conventional diplexers are constructed by combining two BPFs having distinct frequencies through a three-port impedance-matching network, such as a T-junction. Recently, the balanced circuit has been widely used in modern communication systems due to its good CM rejection capability, which results in higher immunity to the environmental noise [3,4,5,6]. Hence, a great deal of effort has been spent on achieving balanced diplexers through use of innovative circuit topologies [7,8,9].…”