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Design of dual-band −3 dB couplers with a wide range of dual-band frequency ratios

Design of dual-band −3 dB couplers with a wide range of dual-band frequency ratios

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A novel topology for designing dual-band couplers with −3 dB coupling and a wide range of dual-band frequency ratios is presented. The proposed structure consists of two coupled-line sections connected by two uncoupled lines and four tapped stubs. This coupler can achieve a high frequency ratio of up to 5 by adjusting the impedance of tapped stubs. An experiment coupler operating at 0.7/2.6 GHz with a frequency ratio of 3.71 and −3 dB coupling was fabricated for demonstration.

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2016.1340
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