In this research paper, a isosceles triangular radiating patch with two triangular coplanar parasitic elements has been used to design a compact circularly polarized (CP) microstrip patch antenna that can be used for (2.320‐2.345 GHz) satellite digital audio radio systems (SDARS), (2.30‐2.39 GHz) wireless broadband (WiBro), LTE 2300 (2.3‐2.4 GHz), and WIMAX (2.50‐2.69 GHz) application band. Corners of the two parasitic element along with a portion of driver patch has been cut and optimize to obtain CP characteristics of the antenna with broadside radiation pattern. A slot is also introduced and optimized on the radiating patch to improve the impedance matching. Frequency band generated by the antenna is (2.09‐2.64 GHz) having impedance bandwidth of (S11 ≤ −10 dB) 550 MHz 23.25% and two 3‐dB axial ratio (AR) bandwidth of 5.1% (2.29‐2.41GHz) and 1.54% (2.58‐2.62 GHz). The size of proposed antenna is 56 × 52 × 3.2 mm3 in which, FR4 material has been used as dielectric substrate and thin copper plate as radiating patch and ground. Before physical fabrication, HFSS ver13 software has been used to design and analyzed the proposed antenna. It has been found that the measured results of fabricated antenna and simulated results are closely matching.

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In this paper, a stacked microstrip patch antenna with polarization reconfigurable property has been proposed for worldwide interoperability for microwave access (WiMAX) application. The proposed antenna has two substrate layers: upper and lower layers with two radiating patches connected with the coaxial probe. Without the upper layer the lower square-shaped substrate layer having regular hexagonal radiating patch with probe fed acts as a linear polarized antenna with impedance bandwidth for (S11 ≤ −10 dB) is 370 MHz 10.56% (3.32–3.69 GHz) cover WiMAX (3.4–3.69 GHz) application band. The hexagonal radiating patch is perturbed with an optimum rectangular slot to enhance the impedance bandwidth of the antenna. The lower substrate layer having hexagonal patch with the same probe position is stacked with the upper square-shaped substrate layer with same sized square patch and the upper patch soldered with the coaxial probe. The overall stacked antenna generates a circularly polarized band when the opposite corner of the top square radiating patch of the upper layer is truncated with optimum size. In order to generate another circularly polarized band and to improve the input impedance matching of the stacked antenna, the top radiating patch is perturbed with two slots and a slit. The stacked circularly polarized antenna generates impedance bandwidth of 12.75% (3.23–3.67 GHz) for (S11 ≤ −10 dB) with two circularly polarized bands (3.34–3.37 GHz) and (3.66–3.70 GHz) as per (axial ratio ≤ 3 dB) for WiMAX application. Therefore, the proposed antenna can be used as linearly polarized or dual band circularly polarized according to requirement.