@article{paperid:1032895, author = {Pourzadi, Aref and Attari, Amir Reza and Majedi, Mohammad Saeed}, title = {A Directivity-Enhanced Directional Coupler Using Epsilon Negative Transmission Line}, journal = {IEEE Transactions on Microwave Theory and Techniques}, year = {2012}, volume = {60}, number = {11}, month = {November}, issn = {0018-9480}, pages = {3395--3402}, numpages = {7}, keywords = {Directional coupler; directivity; even/odd modes; metamaterial; epsilon negative transmission line}, }