Novel dual circular stacked microstrip patch antenna design for S-band UWB applications

In this paper, the design and performance analysis of dual circular stacked microstrip patch antenna for S-band applications has been proposed. In the proposed antenna design, the substrate of material FR 4 having dielectric constant 4.4 have been used. The ground, patch and feedline are of copper material. The proposed antenna has two circular stackings on the patch and the antenna has impedance bandwidth of 110 MHz with operating frequency ranging from 3.34 GHz to 3.45 GHz. In the proposed antenna design, the stacking has been employed to enhance the directivity and return loss. The proposed antenna design has been fed by microstrip feedline having impedance of 49.36 Omega. The performance of antenna has been analyzed in terms of return loss (dB), impedance bandwidth (MHz), directivity (dBi), gain (dB), VSWR and impedance (ohms). The proposed antenna design resonates at 3.40 GHz frequency with minimum return loss of -41.55 dB, gain of 4.45 dB and directivity of 6.47 dBi. The proposed antenna can be used for S-band (2GHz - 4 GHz) applications. The proposed antenna has been designed and simulated using CST Microwave Studio 2014. The proposed antenna has been successfully fabricated and tested using E5071C network analyzer and anechoic chamber. It has been observed that the CST simulated antenna results closely match with the practically fabricated results of the proposed antenna.