Millimeter-Wave Dual-Mode Filters Realized in Microstrip-Ridge Gap Waveguide Technology

  • Slobodan BirgermajerEmail author
  • Nikolina Janković
  • Vesna Crnojević-Bengin
  • Vasa Radonić


In this paper, we propose novel microstrip-ridge gap waveguide (MS-RGW) millimeter-wave bandpass filters based on a dual-mode resonator. The resonator represents a rectangular patch grounded by a set of vias, whose pair of fundamental degenerate modes are separated in the spectrum using the via position perturbation. MS-RGW feeding lines are realized as periodically grounded microstrip lines inserted into a perfect magnetic conductor (PMC) structure, which are fed via the 2.92-mm connector through the specifically designed transition. A detailed analysis of the filters is provided together with the analysis of their building blocks—mushroom-based PMC surface, MS-RGW with periodically grounded microstrip line, and dual-mode resonator. The proposed filters are fabricated using standard PCB technology and the measured results show that the filters exhibit low losses, good in-band and out-of-band characteristics, and good selectivity. As such, the proposed filters represent excellent candidates for millimeter-wave filtering applications since they reconcile the requirements for high performance, low loss, and low cost.


Microstrip-ridge gap waveguide Dual-mode resonator Filter Mushroom unit cell PMC PEC 



The authors would like to thank the colleague Dr. Ferenc Lénárt, from the Department of Broadband Infocommunications and Electromagnetic Theory, Budapest University of Technology and Economics, for providing his expertise and laboratory resources in the measurements of fabricated circuits.

Funding Information

This work was financially supported by the Serbian Ministry of Education, Science and Technological Development through the project III 44006 “Development of new information and communication technologies, based on advanced mathematical methods, with applications in medicine, telecommunications, power systems, protection of national heritage and education.”


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.BioSense InstituteUniversity of Novi SadNovi SadSerbia

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