Dual Band Dual Polarized Coaxial Feed Microstrip Patch Antenna for Wireless Applications

In this paper, a square-shaped coaxial feed microstrip patch antenna with dual band dual polarization [linearly polarized (LP) and circular polarized (CP)] is designed. The square patch antenna is enhanced to achieve dual band resonance and improved impedance matching at 2.4 and 3.5 GHz by introducing V-shaped asymmetric slits. Additionally, a rectangular modified slot is suggested at the center of the patch, resulting in the generation of circular polarization (CP). At 2.4 GHz, an axial ratio (AR) of less than 3 dB is measured, indicating the production of left-handed circularly polarized waves. The impedance bandwidth (IBW) \(\left| {S_{11} } \right| \le 10\) (dB) is 4.44% (3.52–3.68 GHz) at the lower and 2.85% (3.45–3.55 GHz) at the upper band while the antenna has a decent gain of 3 dB at upper CP band and 1.1 dB at lower LP band.