In this letter, a miniaturized rat-race coupler with harmonic suppression is proposed. The quarter-wavelength transmission lines in a traditional rat-race coupler are substituted by their equivalent stub-loaded transmission lines. As a result, the overall size is significantly reduced while maintaining the coupler performance. Furthermore, one transmission zero is introduced by the stubs to suppress the harmonics. Finally, a miniaturized rat-race coupler with harmonic suppression is designed, fabricated and measured, and the measurement verifies the theoretical and simulation analysis.
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Nie et al. (2014) studied this question.
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