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- Substrate integrated waveguide cavity backed slot antennas for millimeter-wave applicationsPublication . Finich, Sanaâ; Salgado, Henrique; Pinho, PedroA low-cost single-layer substrate-integrated waveg uide (SIW) cavity-backed slot antenna is proposed for millimeter wave applications. The structure is designed to operate at the W-band. The T-shaped slot antenna is placed on the back-side of the SIW and fed by a grounded coplanar waveguide (GCPW) transmission line. A transition between the (GCPW) and the SIW is also designed. The simulated results provide that the antenna has a stable gain over the frequency range (98.79-100.56) GHz with a maximum value of around 6 dBi also high radiation efficiency.