Abstract
Directional couplers can isolate, mix, and orient signals, and play an important role in RF circuits. In this paper, the quadrature coupler is firstly analyzed theoretically. According to the results of the theoretical analysis, a microstrip 3dB quadrature directional coupler with a new structure based on 2.2GHz is designed using ADS after the design objective is given. After repeated simulation optimization, the coupling degree is optimal.
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