ROTATED RECTANGULAR SLOTS AND MIRRORED INVERSED CANTOR-SETS ON ULTRAWIDEBAND ANTIPODAL VIVALDI ANTENNA

Sabri Alimi (Department of Electrical Engineering, Faculty of Engineering, Universitas Diponegoro)
Teguh Prakoso (Telecommunication Engineering, Universitas Diponegoro)
Munawar Agus Riyadi (Department of Electrical Engineering, Faculty of Engineering, Universitas Diponegoro)

Sinergi
Vol 23, No 2 (2019)

Variants of antipodal Vivaldi antenna (AVA) design suitable for access point working on 0.5 – 6.0 GHz are proposed in this paper. The novel designs were produced by employing three novel techniques to conventional AVA: (i) rotated-slot pattern to shift down the frequency cutoff and enhancing bandwidth, (ii) curve design to miniaturize rotated-slot-inserted antipodal Vivaldi, and (iii) fractal-director (Cantor set) to increase the gain of antipodal Vivaldi. Using FR4 (relative permittivity of 4.4) with an overall dimension of 300 mm x 143 mm x 1.6 mm the antenna designs are able to work at a frequency of 0.472 GHz to higher than 6 GHz with a maximum gain of 11.9 dBi.