Bi‐directional SIW leaky‐wave antenna using TE ₂₀ mode for frequency beam scanning

Abstract

A compact bi‐directional leaky‐wave antenna (LWA) based on TE 20 mode substrate integrated waveguide (SIW) is proposed at X‐band. The microstrip power divider–slotline transitions are utilised to excite TE 20 mode SIW array in order to enhance the overall radiation capability of the designed structure. The rectangular slots are etched out on the top and bottom plane of SIW such a way that the orientation of the slots can perturb the distribution of electric field at TE 20 mode and provide bi‐directional radiation. The proposed antenna is working within the frequency range of 9.6–11.2 GHz ( S 11 < −10 dB) having the beam scanning range of 66° from both top and bottom side of the structure with maximum gain of 14 dBi. All experimental results show a fair agreement with the simulated data.