... IEEE Transactions on Microwave Theory and Techniques, Vol. 23, No. 12, December 1975, pp. 9 78 984 , ISSN. 00 18- 9 480 . Advanced Microwave Circuits and Systems3 70where Z0 and Z1are impedances ... the reference to Port 1 and 2 Advanced Microwave Circuits and Systems3 54 The simulated magnitudes of q4, q5, q6 and q7 are 2.3 ± 0.9, 1.9 ± 0 .8, 2.1 ± 0.6 and 2.5 ± 0.9, while the ... ultrawideband three-section microstrip-slot coupler. Microwave and Optical Technology Letters, Vol. 51, No. 8, August 2009, pp. 188 9- 189 2, ISSN. 10 98- 2760. Somlo, P. I. & Hunter, J. D. (1 982 )....