Title : ( A Directivity-Enhanced Directional Coupler Using Epsilon Negative Transmission Line )
Authors: Aref Pourzadi , Amir Reza Attari , Mohammad Saeed Majedi ,
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Abstract
In this paper, a high directivity parallel coupled line coupler using the negative (ENG) transmission line is proposed. With the aid of even- and odd-mode analysis, it is shown that by using ENG transmission lines in a parallel coupled line coupler, the even- and odd-mode phase velocities can become equal at a desired frequency. Hence, the directivity of a coupler can be infinite theoretically. The coupler circuit model and closed-form relations for lumped elements of this model are presented. In addition, a design procedure for microstrip implementation of this coupler is proposed. Based on the proposed procedure, a 10-dB ENG directional coupler is designed at 2 GHz and validated by full-wave simulations. This coupler is fabricated and measurement results are presented. Experimental results show maximum directivity of nearly 40 dB at 1.95 GHz.
Keywords
, Directional coupler, directivity, even/odd modes, metamaterial, epsilon negative transmission line
@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},
}
%0 Journal Article
%T A Directivity-Enhanced Directional Coupler Using Epsilon Negative Transmission Line
%A Pourzadi, Aref
%A Attari, Amir Reza
%A Majedi, Mohammad Saeed
%J IEEE Transactions on Microwave Theory and Techniques
%@ 0018-9480
%D 2012
