Design considerations for a wide scan cavity backed patch antenna for active phased array radar

This paper presents design & development process of a wide band, wide beam, foam-filled cavity backed patch antenna in C-Band for an active phased array radar. The measured results have shown a return loss < −10dB, 3-dB beamwidth > ±60 °/ ± 50°in H-/ E-planes, gain between 4.0–4.8 dB and efficiency > 85% over 18% bandwidth in C-Band.