Abstract
This paper proposes bandwidth enhancement of a cavity-backed slot antenna using a triangular slot on a half-mode substrate integrated waveguide structure antenna. The bandwidth enhancement was achieved by combining the fixed TE101 and the downward shifting TE102 modes, resulting in hybrid modes. The design evolution of the slot antenna from a half nonresonating rectangular slot to a triangular slot antenna increased the fractional bandwidth. The simulation result showed that fractional bandwidth increased from 6.27% to 9.1%. It was confirmed by measurement that the fractional bandwidth of 9.87% was achieved which reflects a 350 MHz bandwidth with center frequency at 3.84 GHz. The measured gain at center frequency was 4.2 dBi. It is shown that the radiation characteristics obtained from both measurement and simulation results are in very good agreement.
Highlights
Cavity-backed slot (CBS) antennas using the substrate integrated waveguide (SIW) technology provide easy integration in the planar form and enable low-cost fabrication for various applications
Bandwidth enhancement for a cavity backed by a triangular slot antenna in the half-mode substrate integrated waveguide (HMSIW) structure is proposed using a geometric structure, as shown in Figure 1. e triangular slot was etched on the ground layer that acted as a nonresonating slot. e top layer acted as a metallic reflector. e triangular slot excited the first mode TE101 at 3.8 GHz and the second mode TE102 at 3.98 GHz. eir impedance matched the frequency range as a hybrid resonance
The fractional bandwidth of HMSIW increases to 6.27% (240 MHz). is HMSIW structure prevents the shifting of the resonant frequency to a lower frequency because the electric field radiates across the dielectric aperture by the first mode TE101. e modification of nonresonating slot into a triangular slot will cause more impedance bandwidth improvement up to 350 MHz, which has 9.1% for fractional bandwidth
Summary
Cavity-backed slot (CBS) antennas using the substrate integrated waveguide (SIW) technology provide easy integration in the planar form and enable low-cost fabrication for various applications. E miniaturization of the SIW-CBS antenna can vertically cut the magnetic field of the full-mode SIW (FMSIW) into two parts of the half-mode substrate integrated waveguide (HMSIW) structure, as shown in [1,2,3,4]. By using the HMSIW structure, 50% miniaturization of the antenna was obtained; all the fractional bandwidths in [1,2,3,4] were below 7%. Researchers have implemented a hybrid mode or a multiresonance mode to enhance the impedance bandwidth, as shown in [6,7,8]. Bandwidth enhancement is proposed using a triangular slot on the HMSIW structure. Is provides a significant advantage because the mixing of HMSIW structure together with the triangular slot could effectively enhance the bandwidth to reduce antenna dimensions. The proposed antenna could be used for the fifth-generation telecommunications where its International Journal of Antennas and Propagation application needs broad bandwidth characteristic and compact design antenna
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
