Comparative Analysis and Measurement of Coupling Coefficient of a Microstrip Directional Coupler

摘要

In this paper a simple design procedure is to used to design a microstrip directional coupler with accurate formulation. It comprises a complete design of symmetrical two-line microstrip directional coupler including physical length at the desired operational frequency. The design procedure doesn't require the prior knowledge of the physical geometry of the coupler and requires only the information of the port impedances, coupling and operational frequency. A 15-dB coupler is designed and fabricated for 900MHz using two design methods. The validity of the two design methods are compared by em-simulations and measurements.