Bandwidth Enhancement of Substrate Integrated Waveguide Cavity-backed  Bow-tie-complementary-ring-slot Antenna using a Shorted-via

Arvind Kumar; S. Raghavan

doi:10.14429/dsj.68.11827

Arvind Kumar Department of Electronics and Communication Engineering, National Institute of Technology, Trichy, - 620 015
S. Raghavan Department of Electronics and Communication Engineering, National Institute of Technology, Trichy, - 620 015

DOI: https://doi.org/10.14429/dsj.68.11827

Keywords: Cavity-backed antenna, Slot antenna, Shorted-via, Substrate integrated waveguide, Wideband

Abstract

In this study, a planar cavity-backed bow-tie-complementary-ring-slot antenna is proposed, and a new approach for bandwidth enhancement using a shorted-via is introduced. A shorted-via concept overcomes the narrow impedance bandwidth of a conventional substrate integrated waveguide cavity-backed antenna. By adjusting the location of the shorted-via (placed just above the centroid of the radiating slot), the individual bandwidth of the lower and higher order resonances has been tuned below -10 dB criterion, which results in the broadening of the bandwidth. Finally, the antenna is proficient to operate for an impedance bandwidth of 15.71 per cent, ranging from 12.02~14.07 GHz. The proposed antenna shows a gain of better than 4 dBi within the operating band with less than 0.5 dBi variation. Moreover, the antenna preserves good radiation characteristics, which is similar to that of the conventional metallic counterpart. To validate the simulated results, an antenna is fabricated and tested. The simulated results in terms of the reflection coefficient, gain, and radiation patterns are in good agreement with the measured results.

Author Biographies

Arvind Kumar, Department of Electronics and Communication Engineering, National Institute of Technology, Trichy, - 620 015

Mr Arvind Kumar received his BE (Electronics and Communication Engineering) from Govt. Engineering College, Ajmer, India, and ME (Electronics Engineering) from Pondicherry Central University, India. Presently pursuing his PhD in the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli, India. He has contributed 4 papers in international journals.

S. Raghavan, Department of Electronics and Communication Engineering, National Institute of Technology, Trichy, - 620 015

Dr S. Raghavan received his BE (ECE) from College of Engineering, Guindy, ME (Microwave Engineering) from College of Engineering, Trivandrum. He completed his PhD from IIT Delhi, India. Presently working as a Professor at National Institute of Technology, Tiruchirappalli, India. His research interest includes : Microwave/millimeter-wave circuits and devices, microwave integrated circuits, antennas, EMI/EMC, computational Electromagnetics, RF/BIO MEMS, metamaterials and microwaves in biomedical applications. He has contributed more than 100 papers in journals and more than 200 papers in conferences proceedings.