Author : Litty Baby and Neenu Rosia Michael

The wideband antennas play significant role in the communication fields especially in satellite and military applications. Since the satellite or aircraft is in motion, the size of the wideband antenna as well as the polarization is very important. Electro-magnetic band gap structures and artificial magnetic conductor structures are usually used to enhance the spiral antenna properties. But these structures are absorbing materials and the bandwidth will be reduced. Here, a spiral antenna is designed , simulated and fabricated for aircraft applications with bandwidth enhancement. The circular polarization of this spiral antenna provides improvement for the gain and radiation of antenna. The complexity in the antenna structure is eliminated and the efficient impedance matching technique used in the work provides better performance. This antenna gives a better reflection coefficient and VSWR for the entire frequency band. The proposed antenna is fabricated using FR-4 substrate.

Keywords: Spiral antenna, impedance matching transformer, reflection coefficient

Article published in International Journal of Current Engineering and Technology, Vol.5, No.5 (Oct-2015)