Three-section trans-directional coupler of X-band

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Authors: Sychev A. N., Struchkov S. M., Rudyy N. Yu.

Annotation: The cascade connection of dissimilar types of couplers is studied. In a simulated three-section coupler, central section with tight coupling (1 dB) is trans-directional; two external sections with loose coupling (12 dB) are contradirectional. The resulting coupler becomes trans-directional with 3 dB coupling. Transdirectional coupledline section is formed by vertical insert of ceramics with a high dielectric permeability. A prototype was designed for operating in X-band (8–12 GHz) and measured. Its performance was evaluated as acceptable.

Keywords: coupled lines, trans-directional coupler, vertical insert