Flush Mountable Multi-Octave Band Circularly Polarized Printed Antenna for Missile and Satellite Applications

Abstract

For wideband circular polarization, an impressed, bidirectional antenna fed by a microstrip line is proposed. The proposed antenna evolves by transforming a Bow-tie dipole geometry into a symmetric rotational structure for the generation of circularly polarized wideband (CP) radiation. The dipole configuration side arms are adjusted by loading with rectangular stubs. The feeding edges of the bow-tie dipole system contain filets. The feeding edges of the bow-tie dipole system contain filets. This modification helps to considerably improve the bandwidth of the Axial Ratio (AR). The anticipated multi-octave antenna’s simulated and calculated impedance bandwidth (S11 <-10 dB) is from 1.3 GHz to 6GHz, and from 1.55 GHz to 6 GHz respectively. The antenna’s measured 3-dB AR bandwidth is from 0.93 GHz to 5.89 GHz.