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Design and development of a dual directional coupler with transformers for HF band applications

Dual Directional Couplers have profound application in RF and microwave instrumentation. This paper presents the design and development aspects of a dual directional coupler operating in the HF band using transformers. The coupler was assembled and tested on a PCB and detailed measurements where taken using Network Analyser. It was successfully integrated into the Power Amplifier Unit of a Software Defined Radio Transmitter for VSWR and power monitoring. The performance analysis was done upto 150W of RF power.