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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 645638, 7 pages
Research Article

Design of Tunable Equalizers Using Multilayered Half Mode Substrate Integrated Waveguide Structures Added Absorbing Pillars

1Department of Electromagnetic Wave and Antenna Propagation, Institute of Information Science and Technology of Zhengzhou, Zhengzhou, Henan 450001, China
2Microwave Tech and Antenna, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Received 7 June 2015; Revised 17 September 2015; Accepted 28 September 2015

Academic Editor: Giovanni Berselli

Copyright © 2015 Shuxing Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An equalizer based on multilayered half mode substrate integrated waveguide (HMSIW) structures with high -factor, low loss, and compact size is proposed for the first time. Resonant cavities distributing in the upper substrate and the bottom substrate, with the middle substrate layer which works as the transmission line together, constitute a multilayer structure. The design method and theoretical analysis are summarized first. The mode analysis, simulated results, and measured results are all provided. The measured results show a good performance and are in agreement with the simulated results, and the maximum attenuation slope reaches −16 dB over 12.5 GHz~14.5 GHz. With the use of absorbing pillars, the attenuation and value can be tuned more easily than the other planar equalizers. Compared with the SIW equalizer, the size of this structure reduces by 50%. Furthermore, this structure is suitable for the miniaturization development of equalizers.