In this work, a compact broadband high-gain \(2 \times 2\) array antenna is presented. The proposed antenna is fabricated on a \(44\;{\text{mm}} \times 51\;{\text{mm}} \times 1.6\;{\text{mm}}\) lossy FR4 substrate with relative permittivity \(\varepsilon_{r} = 4.4\) . A microstrip feed line is used to excite the radiators. It covers a broad impedance bandwidth of 1.66 GHz (7.14–8.8 GHz) for 7.25–7.75 GHz and 7.9–8.4 GHz X – band satellite communication. A circular polarization (CP) mode is generated at 7.88 GHz for equal electric fields \(E_{X}\) and \(E_{Y}\) with \(90^{^\circ }\) phase difference in X and Y directions. The achieved axial ratio bandwidth (ARBW) is 0.18 GHz (7.8–7.98 GHz) with 10.2 dBi peak gain. The main novelty in this work is small size, high gain, broadband, and circular polarization. This antenna is specially designed for 7.25–7.75 GHz/7.9–8.4 GHz X – band satellite communication systems.
