Abstract
A novel compact branch-line coupler operating in two arbitrary frequencies is proposed, analyzed and designed. Stepped- impedance stubs are used in the branch-line coupler to achieve dual- band applications. Parameters of the structure are chosen and provided for design guidelines. Broader operating frequency ratios and compactness are achievable. For the purpose of validation, a microstrip coupler operating at 2.4/5.2GHz is fabricated and measured.
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