Abstract: A novel structure of three section re entrant hybrid coupler is proposed with a simple structure, easy debugging and good performance. In addition, a three section re entrant hybrid coupler with ternary bandwidth (0.8～2.4 GHz) has been designed and tested. The measured performance shows good agreement with theoretical prediction. Experimental data well agree with the simulated results.

Key words: coaxial line, hybrid couplers, three section re entrant