Ka-Band Long Slot Antenna using Printed Ridge Gap Waveguide Technology

A Ka-Band frequency scanning antenna is presented using Printed Ridge Gap Waveguide (PRGW) technology. A substrate printed structure is designed and simulated. A Quasi-Transverse Electromagnetic (TEM) horn Antenna is shaped in the printed ridge form. The wave is guided along the printed ridge in the airgap. The radiation is caused by the presence of long slots array. A grating lobe also exists due to 1λ
g
distance between slots. Coaxial feeding method is used for printed ridge excitation. The structure is simulated in CST microwave studio for full-wave analysis. The proposed antenna results in good matching bandwidth from 22 to 29.6 GHz. The antenna also results in higher gain and frequency scanning between 24.6 to 29.6 GHz.