Abstract
The design describes a new planar dual arm equiangular spiral antenna with substrate mounted chip resistor and tapered microstrip line as feed to antenna. The use of chip resistor at the center of antenna joining two arms of the spiral with optimized spiral curves growth rate enhances the fractional impedance as well as axial ratio antenna bandwidth. The 1.75 turn spiral structure is printed on RT/duroid substrate which radiates opposite sense of polarizations on either side of antenna. HFSS simulation results are presented here. Return loss is achieved better than 10.0 dB from 1.0 to 19.0 GHz and maximum axial ratio obtained is 4.5 dB from 2.0 to 15 GHz. It is compared to previously reported antenna structure of same size $85\times 76 \mathbf{mm}^{2}$ . The simulation result shows that the present antenna configuration has noticeable enhancement in impedance as well as axial ratio bandwidth. Antenna has been fabricated and carried out the measurement. Measured return loss, radiation pattern and axial ratio are presented, deviation from simulation result and reason thereof is addressed.
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