Design of Compact Rat-Race Couplers with Coupled Resonators
Date Issued
2009
Date
2009
Author(s)
Wang, Wei-Hsin
Abstract
This thesis presents several miniaturized rat-race couplers with coupled-resonator network. The -line and -line sections of conventional rat-race coupler can be replaced with electric and magnetic coupling between resonators due to the opposite phase responses of electric and magnetic coupling. Therefore, the conventional rat-race coupler can be transformed into a coupled-resonator network. As a result of the coupled-resonator configuration, power transmission mainly occurs at the common resonant frequencies of the resonators. Therefore, bandpass response can be achieved in this topology. On the other hand, the dimension of coupler can be reduced as the size of resonator becomes smaller. or miniaturization, a rat-race coupler with meandered quarter-wavelength resonators is proposed in this thesis. The implemented coupler only occupies 7% circuit size of the conventional one. Furthermore, to enhance stopband performance, compact net-type resonator with controllable harmonics is introduced. By utilizing compact net-type resonators, the proposed rat-race coupler occupies 16.8% circuit size of the conventional design, while the rejection level in the stopband is better than 30dB up to 4.3f0.
Subjects
rat-race coupler
resonator
stepped-impedance resonator
compact
Type
thesis
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