A novel reflection-canceling design for substrate integrated waveguide based 45-degree linearly polarized slot antenna array

This paper introduced the waveguide slot array antennas are an important class of microwave antennas with numerous applications such as radar and communication systems. A 10-element K-band SIW based 45-degree linearly polarized slot traveling-wave antenna array is proposed and designed. Metalized through holes (via) are used to cancel the reflection and support a traveling wave. The reflection characteristics and radiation pattern were calculated by full-wave simulation using Ansoft HFSS. A high gain of 15.3dBi and low cross polarization of -23.5dB was achieved. This 45 degree polarized antenna array has a wide application in microwave and millimeter-wave systems, especially for auto-motive collision-avoidance radar.