1Visvesvaraya Technological University, Belagavi, Karnataka, India
2Faculty of Engineering and Technology, M. S. Ramaiah University of Applied Sciences, Bangalore, 560 054
*Contact Author e-mail: kunwarjam@gmail.com
Online published on 18 February, 2020.
Energy from most of the EM radiations can be harvested by designing an ultra wideband antenna having a bandwidth of 0.5 to 18.5 GHz. The most viable solution for ultra wide band coverage is the Archimedean spiral antenna. The bandwidth of this antenna is upto 40: 1 for both the input impedance and the radiation pattern. The same antenna can be installed on radar, to harvest the energy from electromagnetic interference and jamming signals in the frequency range of UHF to KU band. The antenna has a gain of 5.77 dBi, return loss less than-10 dB and VSWR 1–2 for almost complete frequency range. Spiral antenna being a balanced one, needs Balun for balancing the feed as well. The Balun designed with a Micro Strip Line (MSL) to Parallel Strip Line (PSL) transition is used as a balanced feed. Back-to-back MSL to PSL Balun assembly has a return loss less than-15dB over the band of operation and the combined assembly gives a peak gain of 11 dBi for almost entire band.
Back-to-Back Balun, Circular Polarization, Microstrip to Parallel Strip Planar, Self-Complementary Structure, Spiral Antenna, Ultra Wide-Band
