Design of a circular patch sub-array microstrip antenna with dual linear polarization for Ku-band satellite communication applications

• A phased array antenna with dual linear polarization is designed for Ku-band. • Rhombus-shaped feed structure ensures dual polarization and precise beam control. • Simulation results achieve S11 of -48.36 dB at 12.55 GHz with a gain of 8.991 dBi. • Measurement results show a frequency shift to 12.33 GHz with S11 of 13.28 dB because of fabrication and difference in the relative permit- tivity substrate. • The design supports reduced interference and large capacity for satellite communications. A phased array antenna design is needed to address the needs of satellite communication systems with more precise beam direction levels, reduced in- terference, and significant capacity support. Antenna polarization is a crucial parameter that determines the orientation of the propagated electromagnetic wave and the maximum power generated. This research has designed dual linear polarization antennas with rhombus-shaped feed to address some of the shortcomings of previous designs, such as complex design, not compact, and difficulty matching impedance. Simulation results and S11 parameter measurements are less than −10 dB. Initial simulation results show that S11 is −48.36 dB at a frequency of 12.55 GHz with a bandwidth of 360 MHz and a gain of 8.991 dBi. The measurement results show a frequency shift to 12.33 GHz with an S11 value of −13.28 dB, a bandwidth of 310 MHz, and a gain of 7.627 dBi. The parameter shift is due to differences in the dimensions of the fabrication results and differences in the relative permittivity value of the substrate. After tuning the simulation, −22.68 dB was obtained on S11 at a frequency of 12.33 GHz with a bandwidth of 924 Mhz and a gain of 9.369 dBi. This study successfully designed and tested a compact linear dual-polarization patch sub-array antenna using a rhombus-shaped feeding technique for satellite communication receiver applications based on the S21 parameter results with maximum horizontal and vertical orientation values.