International journal of RF and Microwave Computer-Aided Engineering, ( ISI ), Volume (27), No (8), Year (2017-10) , Pages (1-9)

Title : ( Development of broadband forward-wave directional couplers loaded by periodic patterned ground structure )

Authors: ZAHRA SADAT TABATABAEIAN , Mohammad Hassan Neshati ,

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In this paper two wideband Forward-Wave Directional Couplers (FWDCs) with 0 dB and 3 dB coupling level are proposed. Using periodic patterned ground structure in a microstrip coupled lines by a new unit cell; even- and odd-mode characteristic impedances of the couplers are equal over a wide frequency range. Moreover, it provides a constant phase difference between even and odd-modes. The proposed cell is modeled using the equivalent circuit model and a design procedure is introduced for designing FWDCs for an arbitrary value of coupling level. The introduced couplers are numerically investigated and a prototype of both couplers is made. It is shown that for 0 dB coupling level, the measured coupling is 0.85 dB with 1 dB flatness over fractional bandwidth of 96% bandwidth. In case of 3 dB coupling, the measured coupling level is 3.5 dB at 7.42 GHz with 1 dB flatness over fractional bandwidth of 67.1%.

Keywords

, composite right/left hand, directional coupler, microstrip coupled
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@article{paperid:1063290,
author = {TABATABAEIAN, ZAHRA SADAT and Neshati, Mohammad Hassan},
title = {Development of broadband forward-wave directional couplers loaded by periodic patterned ground structure},
journal = {International journal of RF and Microwave Computer-Aided Engineering},
year = {2017},
volume = {27},
number = {8},
month = {October},
issn = {1096-4290},
pages = {1--9},
numpages = {8},
keywords = {composite right/left hand; directional coupler; microstrip coupled line},
}

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%0 Journal Article
%T Development of broadband forward-wave directional couplers loaded by periodic patterned ground structure
%A TABATABAEIAN, ZAHRA SADAT
%A Neshati, Mohammad Hassan
%J International journal of RF and Microwave Computer-Aided Engineering
%@ 1096-4290
%D 2017

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