Title :
Slot spiral antenna
Author :
Volakis, J.L. ; Nurnberger, M.W. ; Filipovic, D.S.
Author_Institution :
Radiat. Lab., Michigan Univ., Ann Arbor, MI, USA
fDate :
12/1/2001 12:00:00 AM
Abstract :
When compared to printed cavity-backed spirals, slot spiral antennas offer the possibility of designs that are conformal and very thin. We discuss the physical characteristics of a cavity-backed slot spiral, as well as the associated infinite balun and termination designs. Simulations of the proposed cavity-backed spiral are presented and used to optimize the antenna´s various parameters. Comparisons of measurements and calculations are also given, to validate the gain and axial-ratio computations. Several options for miniaturizing this design, using capacitive and inductive loadings, are also presented
Keywords :
baluns; conformal antennas; slot antennas; spiral antennas; antenna parameters optimization; axial ratio; broadband cavity-backed spiral slot antenna; capacitive loading; characteristics; circular polarization; conformal antennas; design miniaturization; dielectric loading; gain; inductive loading; infinite balun design; printed cavity-backed spirals; simulations; slot spiral antennas; termination design; Bandwidth; Broadband antennas; Dielectric resonator antennas; Electronic countermeasures; Impedance matching; Laboratories; Loaded antennas; Microstrip antennas; Slot antennas; Spirals;
Journal_Title :
Antennas and Propagation Magazine, IEEE
