Title :
Investigations on a novel modified archimedean spiral antenna
Author :
Shanmugam, Balamurugan ; Sharma, Satish K.
Author_Institution :
Dept. of Electr. & Comput. Eng., San Diego State Univ. (SDSU), San Diego, CA, USA
Abstract :
A conventional planar two-arm balanced-mode Archimedean spiral antenna has an impedance close to 170 Ω (theoretically 188 Ω) and needs a balun to be fed with a 50 Ω line. The proposed novel modified Archimedean spiral antenna achieves a simple feed without balun by maintaining the antenna input impedance close to 50 Ω over 10:1 frequency band. It shows excellent impedance matching, higher peak gain and acceptable axial ratio over the operating frequencies compared to the conventional Archimedean spiral with the same aperture area.
Keywords :
baluns; impedance matching; planar antennas; spiral antennas; antenna input impedance; axial ratio; balun; impedance matching; planar two-arm balanced-mode Archimedean spiral antenna; Antenna radiation patterns; Frequency measurement; Impedance; Impedance matching; Reflection; Spirals; Spiral antennas; archimedean spiral; frequency independent antennas; wideband antennas;
Conference_Titel :
Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on
Conference_Location :
Spokane, WA
Print_ISBN :
978-1-4244-9562-7
DOI :
10.1109/APS.2011.5996507
