wideband coupler
I like to design and implement 3db coupler in 950-2250Mhz.After some research I found it should be implemented with "hybrid ring" sugested by S. March , D. I. Kim andY. Naito.Now I need their 2 papers:
1- S. March. "A Wideband Stripline Hybrid Ring," IEEE Trans. MTT., Vol. 16, June 1968, p. 361.
2-D. I. Kim and Y. Naito, "Broad-Band Design of Improved Hybrid-ring 3-dB Directional Couplers," IEEE Trans. MTT., Vol. MTT-30, November 1982, pp. 2040-2046.
Tanks