Broadband gap-coupled half-hexagonal microstrip antenna fed by microstrip-line resonator

Abstract

Half‐hexagonal microstrip antenna (H‐HMSA) is a compact version of HMSA, as it resonates at the same fundamental mode frequency. In this article, a compact configuration of a single layer, broadband gap‐coupled H‐HMSA has been proposed. Gap‐coupled H‐HMSA is fed indirectly by a λ/2 microstrip‐line resonator. Broad bandwidth (BW) is achieved with an effective use of resonance introduced by λ/2 resonator and gap‐coupled half‐hexagonal radiating patches. A peak gain of 7.07 dBi and measured BW (S11 ≤ −10 dB) of 11.5% at the center frequency of 5.2 GHz have been achieved, which occupies a small volume of 0.023 λ03 including the ground plane. The radiation patterns remain in the broadside direction throughout the return loss BW. Simulated results of the proposed antenna configuration are experimentally validated with good agreement.

Wideband designs of proximity fed isosceles triangular microstrip antennas gap‐coupled with parasitic pairs of sectoral patches

“…The stacked configuration reported in 20 realizes narrow BW on a thicker substrate in comparison to the proposed antenna. For the wideband designs in, 21,22 shorted microstrip line feed is needed. Wideband design using single slot, fed using the coaxial feed, [23][24][25][26] or slot cut wideband designs using shorting and differential feed, 27,28 offer higher BW with a gain of above 7 dBi.…”

“…A slot cut technique increases the MSA BW without increasing the patch size. Here, different slot shapes like, U‐slot, rectangular slot, and their modified variations have been used 21–31 . A single layer single‐patch slot cut wideband MSAs are relatively complex in design as compared with the simpler multi‐resonator gap‐coupled MSAs.…”

“…Here, different slot shapes like, U-slot, rectangular slot, and their modified variations have been used. [21][22][23][24][25][26][27][28][29][30][31] A single layer single-patch slot cut wideband MSAs are relatively complex in design as compared with the simpler multiresonator gap-coupled MSAs. But in the gap-coupled designs, an effective utilization of an empty space around the fed patch is needed to achieve the BW increase, for smaller amount of increase in the total patch size.…”