A Design of P- to L-Band 45° Linear-Polarized Antipodal Vivaldi Antenna Array

A 45° linear-polarized phased array operated over P- to L-band with a maximum of ±45° scan volume in azimuthal plane is proposed, the array is composed of microstrip-fed antipodal Vivaldi antenna elements. The active reflection coefficients and the spatial polarization characteristic (SPC) of the array with various scanning angles were simulated and optimized with the help of metal baffles as the parasitical parts of the array. For demonstration, a prototype of 45° linear-polarized array is fabricated and measured. The measurement results indicate a wide-band wide-scan performance and the spatial polarization characteristic keeps much stable.