Title :
Equiangular microstrip spiral antennas
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
Abstract :
The input impedance and the broadside axial ratio of a perturbed equiangular microstrip spiral antennas are examined. With the perturbation (modification factor /spl delta/) on its shape, the broadside axial ratio of the equiangular spiral can be significantly reduced. A 21% 3-dB axial ratio bandwidth has been observed. The antenna input resistance can be effectively changed by varying the spiral starting winding angle.
Keywords :
electric impedance; microstrip antennas; spiral antennas; antenna input resistance; axial ratio bandwidth; broadside axial ratio; input impedance; modification factor; perturbed equiangular microstrip spiral antennas; spiral starting winding angle; DSL; Equations; Feeds; Image analysis; Microstrip antennas; Phased arrays; Spirals; Virtual colonoscopy; Voltage; Wire;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1995. AP-S. Digest
Conference_Location :
Newport Beach, CA, USA
Print_ISBN :
0-7803-2719-5
DOI :
10.1109/APS.1995.529992
