Design of a Half-Mode Substrate-Integrated Waveguide (HMSIW) Multimode Resonator Bandpass Filter Using the Minkowski Fractal for C-Band Applications

A substrate-integrated waveguide (SIW) bandpass filter (BPF) with extraordinary selectivity and an adequate upper stopband for C-band Satellite Communication (SATCOM) applications is proposed in this paper. The design comprises comb-shaped slots engraved on a half-mode SIW (HMSIW) that constitute a...

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Bibliographic Details
Published in:Micromachines (Basel) Vol. 15; no. 12; p. 1440
Main Authors: Muchhal, Nitin, Kumar, Abhay, Tewari, Nidhi, Kalia, Samriti, Srivastava, Shweta
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 01.12.2024
Subjects:
bandpass filter
Bandpass filters
Bandwidths
C band
Commercial aircraft
Design
DGS
Electric filters
Electric properties
Electromagnetism
Engraving
fractal
Fractals
Geometry
Ground plane
Insertion loss
Multimode resonators
Radio frequency
Resonant frequencies
Satellite communications
SIW
Substrate integrated waveguides
Technology application
Waveguides
SIW
fractal
DGS
bandpass filter
C-band
ISSN:2072-666X, 2072-666X
Online Access:Get full text
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Summary:A substrate-integrated waveguide (SIW) bandpass filter (BPF) with extraordinary selectivity and an adequate upper stopband for C-band Satellite Communication (SATCOM) applications is proposed in this paper. The design comprises comb-shaped slots engraved on a half-mode SIW (HMSIW) that constitute a multimode resonator (MMR). Its performance is further ameliorated by applying the first and second iterations of the Minkowski fractal curve in the ground plane as a defected ground structure (DGS). The Minkowski fractal has advantages in terms of better bandwidth and miniaturization. The filter is first simulated using the commercial full-wave electromagnetic simulator HFSS v19 and then fabricated on a 0.062′′ (1.6 mm) FR4 with dielectric constant εr = 4.4. The measured results are comparable with the simulated ones and demonstrate that the BPF has a resonant frequency (f0) of 4.75 GHz, a 3 dB bandwidth of 770 MHz (fractional bandwidth of 21.4%), an insertion loss of 1.05 dB, and an out-of-band rejection (in the stopband) of more than 28 dB up to 8 GHz, demonstrating a wide and deep stopband. Using the multimode resonator (MMR) technique, a wide bandwidth has been achieved, and by virtue of using half-mode SIW (HMSIW), the proposed BPF is compact in size. Also, the fractal DGS aids in better stopband performance.
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ISSN:2072-666X
2072-666X
DOI:10.3390/mi15121440