access icon openaccess Compact rat-race ring coupler with meander high-impedance transmission line and port impedance matching

A novel compact rat-race ring coupler with meander high-impedance transmission line and port impedance matching is presented in this Letter. First, a ring coupler with high port impedance is designed using meander lines. Secondly, an impedance matching section is designed to match the high port impedance to ordinary 50 Ω. The proposed coupler effectively reduces occupied area to 16.8% of conventional one. The design is validated both by simulation and measurement.

Inspec keywords: coupled transmission lines; waveguide couplers; impedance matching

Other keywords: port impedance matching; compact rat-race ring coupler; meander high-impedance transmission line

Subjects: Waveguides and microwave transmission lines; Waveguide and microwave transmission line components

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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2015.0102
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content/journals/10.1049/joe.2015.0102
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