Circularly Polarized Sequential Phased Array Antenna Fed Using Proximity Coupling Method

This paper deals with the development of circularly polarized sequential phase array antenna fed using proximity coupling method. The proposed array antenna which designed to work at the L-band frequency is configured by 1×4 slotted and corner truncated square patches. The use of proximity coupling method as well as corner truncation is to achieve wide bandwidth response, while the slot over square patch is applied to produce circularly polarized waves. The array antenna is deployed on two layers of FR4 epoxy dielectric substrate with the dimension of 312mm (length) × 95mm (width) and the total thickness of 3.2mm. From the characterization results, it shows that the -10dB fractional impedance bandwidth of array antenna is 5.5% (1.212GHz-1.28GHz) with the 3dB axial-ratio bandwidth of 54MHz (1.222GHz-1.276GHz).