5-element Series-feed Shared Aperture Antenna Array for X/Ku-Band SAR Applications

This work presents an innovative Dual-band Dual-Polarized Aperture Antenna (DBDP), which operates on a single layer circuit board at X-band and Ku-band. The operating frequency of X band is 9.3 GHz and operating frequency of Ku band is 13.265 GHz. To utilize the common aperture, 5-elements 1X2 array with square microstrip patches are utilized for X-band and for Ku-band 5-elements (1-group) microstrip patch antenna is used. The proposed design is to enhance the gain and isolation by using series-fed center-fed network. The inter-element spacing between two patches is considered 0.7$\lambda$ for the ±25° scan range requirements. The impedance matching bandwidth is 147/266 MHz (X/Ku) and Gain is 12.3/12.2 dBi(X/Ku). The size of the antenna is ${\mathrm {120 mm\times 60mm\times 0.8mm^{3}}}$. The Simulations has been done in CST Microwave Studio. This study demonstrates that a Dual-band Dual-Polarized Aperture Antenna (DBDP) SAA is the optimum choice for large-scale array antennas in SAR applications.