“…Some antennas for radar systems are designed to receive and transmit signal on the same polarization (e.g., HH for horizontal receive and horizontal transmit and VV for vertical receive and vertical transmit), while some complex radar system antennas may be designed transmitting and receiving components working on different polarizations (e.g., HV for horizontal transmit and vertical receive and VH for vertical transmit and horizontal receive). Antennas for radar systems can present various levels of polarization combination, e.g., single-level polarization (HH, VV, VH, or HV), double-level polarization (HH, VV; HH, HV; or VV, VH), triple-level polarization (HH, VV, HV or HH, VV, VH), and fourfold-level polarization (HH, VV, VH, HV) [18][19][20][21][22][23][24][25][26][27].…”