A 2×2 X-band Array Antenna with Sequential Rotation Network Feeding for Communication

The development of a 2×2 array antenna with sequential rotation network feeding for X-band data communication is presented. The minimum requirement of proposed antenna is having 400 GHz impedance bandwidth under −10 dB with working frequencies at 8.0 GHz-8.4 GHz. The proposed antenna will be developed in circularly polarized mode. Thus, the axial ratio must be under 3dB at the desired frequencies. To ensure the antenna design fulfilling all the minimum requirements, some techniques are implemented, for example, triangular truncation factor, ring slot with ellipse shape in the middle of patch, and sequential rotation with relative phases 0 degrees, 90 degrees, 180 degrees, 270 degrees. Then the radiator of antenna is formed by a circular shape. The proposed antenna could fulfil satisfied results. The impedance bandwidth of antenna is obtained 1.8 GHz (7.5 GHz-9.3 GHz). The simulated gain reached 12.5 dBic at the center frequency and the axial ratio bandwidth is 1.17 GHz (7.3 GHz-8.47 GHz). The antenna design is printed at an NPC H220A dielectric substrate with the dielectric constant of 2.17, the thickness of 1.6 mm, and the sizes of 60.92 mm x 60.92 mm.