Design of Wideband Rectangular-Shaped Coupler with Virtual Short Stubs for Wireless Communication Applications

This article presents the design of the sectional rectangular-shaped directional couplers with tight coupling of 3-dB over frequency of 2–6 GHz. The designed coupler consists of two substrates and one common ground plane between the substrate layers. It also formed by two conducting strips with virtual short stubs are placed to the middle section at the top and bottom layer, which coupled through three-section rectangular slots at the ground plane. The effect of these additional stubs in the design is studied and observed. The design and analysis are performed with the use of full-wave electromagnetic simulation software package, CST Microwave Studio. This designed coupler has been fabricated and its wideband performance is verified.

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