Cengiz, Mehmet FarukAllam, A.M.M.A.Fawzy, Diaa E.2023-09-112023-09-1120239788831299077https://doi.org/10.23919/EuCAP57121.2023.10133734https://hdl.handle.net/20.500.14365/483917th European Conference on Antennas and Propagation, EuCAP 2023 -- 26 March 2023 through 31 March 2023 -- 189071This study presents a new circular compact Ultra Wide-Band (UWB) substrate integrated gap waveguide (SIGW) based 3 dB hybrid coupler for Ku band applications. The coupling section is a circular structure with an elliptic slot and additional via to achieve equal-power division in two ports and isolation in the 4th port. To optimize the design parameters of the hybrid coupler, the Finite Integration Time-Domain (FITD) approach is employed. The operating frequency of the coupler is between 12.14 to 15.4 GHz with a central frequency of 13.5 GHz, a bandwidth of 3.26 GHz, and a Fractional Band Width (FBW) being 23.67%. A phase difference throughout the operational spectrum around 90° has been attained. The coupler is fabricated with an overall dimension of 33.8 x 33.8 mm2. The measured and simulated scattering parameters demonstrate satisfactory agreement. © 2023 European Association for Antennas and Propagation.eninfo:eu-repo/semantics/closedAccesshybrid couplerKu-bandSIGWUWBDirectional couplersElectric connectorsSubstrate integrated waveguidesSubstratesCircular structuresDesign parametersGap waveguidesHybrid couplerKu bandPower divisionSubstrate integrated gap waveguideUltra wide-bandUltra-wideWide-bandUltra-wideband (UWB)Conference Paper10.23919/EuCAP57121.2023.101337342-s2.0-85162268987