Apisak Worapishet
Mahanakorn Microelectronics Research Centre (MMRC)
MahanakornUniversity of Technology, Nongchok, Bangkok10530, Thailand
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Manuscript received October 17, 2016
Revised December 11, 2016

A directional microstrip coupler utilizing the stepped impedance coupled lines to equalize the even- and odd-mode phase velocities for directivity enhancement is investigated. The stepped impedance coupler features simple analysis, design, and implementation, with small area requirement, no use of lumped reactive components, and no via holes. Experimental results demonstrate a performance improvement in terms of the directivity by as large as 48.6 dB over the conventional coupler.

Keywords: Directional coupler, directivity, stepped impedance

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