3138 slot

This article presents the design of enhanced two-section microstrip-slot branch-line coupler (BLC) with tight coupling of 3-dB over frequency of 2–5 GHz. rtp guru slot Initial design is based on a common two-section microstrip BLC. abc 138 slot To enhance the bandwidth performance, an overlapped λ/4 open circuited line is adopted to each port Furthermore, each of BLC branch is formed by a microstrip-slot line Shunt