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

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 posi...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2019, Vol.40 (1), p.92-107
Main Authors: Birgermajer, Slobodan, Janković, Nikolina, Crnojević-Bengin, Vesna, Radonić, Vasa
Format: Article
Language:English
Subjects:
Bandpass filters
Classical Electrodynamics
Conductors
Electrical Engineering
Electromagnetic wave filters
Electronics and Microelectronics
Engineering
Instrumentation
Microstrip transmission lines
Millimeter waves
Mushrooms
Perturbation
Resonators
Selectivity
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Summary: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.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-018-0550-y