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I hope these will benefit me...I have to design a coupler at 10Ghz with coupling -20dB. I have used the even and odd mode analysis but the effective ε does not come acceptable. The substrate is GML-1000 with relative permitivity 3.2....Can any one help me with it please. The analysis from www.ee.bilkent.edu.tr/~microwave/programs/magnetic/dcoupler/theory.htm
is attatched which i have tried to use