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A novel compact 3-dB forward-wave directional coupler using periodic open stubs and patterned ground plane is proposed. Not only can the input impedances of the even and odd modes be matched, but also the phase difference between the two modes is largely enhanced. The size of the proposed coupler can be reduced significantly. A test sample is fabricated on Duroid substrate. The 3.3 dB coupling level...
An improved capacitive loading method for miniaturization of 0 dB forward-wave directional couplers is demonstrated. The method enables to miniaturize the coupler to have a predetermined characteristic impedance, eliminating the need for additional impedance transformers and therefore allowing for a substantial improvement in the degree of miniaturization. Experimental results for a 0 dB coupler at...
A novel 3-dB directional coupler using defected ground structure is demonstrated. The input impedances of even- and odd-mode are perfectly matched and the phase difference between even- and odd-mode is also enhanced. Equivalent models are developed to predict the characteristic impedance and dispersion curve of the proposed structure. A tested sample is fabricated on the Duroid substrate. 3.4 dB coupling...
A novel coupled-line forward coupler using composite right-/left-handed transmission lines (CRLH TLs) is presented. Enhanced forward coupling is achieved with the coupled CRLH TLs which have a considerable difference of effective phase constants in the even/odd modes. A circuit model and a microstrip implementation of the proposed CRLH forward coupler are described. The 10-dB forward coupler is simulated...
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