Square loop slots loaded substrate integrated waveguide based horn antenna

ABSTRACT This article represented the effective approach to improve the bandwidth and gain response of substrate integrated waveguide antenna (SIW) using novel defected microstrip structure (DMS) technique for Ku band applications. First of all, Horn antenna was designed using SIW technique and it provided gain around 6 dB. Single square loop slots and multiple square loop slots were introduced in SIW based horn antenna and performance analysis have been carried out. Their responses proved that they were not only responding the fundamental mode but also at different high order modes. Creation of multiple square loop slots not only increased bandwidth but also it increased gains more than 8.5 dB. Moreover, the proposed antennas also responding dual frequencies with more than 500 MHz bandwidth, −2 dB side‐lobe levels and VSWR was around 1.35. All the structures were simulated using Ansoft high frequency structure simulator. Comparison between results verified the effectiveness of the proposed idea. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1577–1582, 2016