Design of Normal Mode Circularly Polarized Helical Antenna at 5.3 GHz

In this paper, a normal mode circularly polarized helical antenna is made of glass without using any type of external impedance matching circuit. The proposed helical antenna is realized by replacing the metallic wire of conventional helical antenna by glass with relative permittivity (εr = 6). The circular polarization is accomplished by optimizing the parameter of glass based helical antenna using CST Microwave Studio. The simulated result shows that the proposed antenna has an input impedance bandwidth (|S11|<; -10 dB) from 4.78 GHz to 6.21 GHz which gives a fractional bandwidth of 26%. Also, the band of frequency in which axial ratio is below 3 dB ranges from 5.23 GHz to 5.64 GHz.