Title :
A theoretical analysis of tape helical antennas
Author :
Peterson, Andrew F. ; Greene, Bruce S. ; Mittra, Raj
Author_Institution :
Electromagn. Commun. Lab., Illinois Univ., Urbana, IL, USA
Abstract :
The authors consider a tape helix separated from a concentric conducting core by a dielectric substrate. A characteristic equation that rigorously accounts for the substrate and conducting core is derived for the propagation constant beta . For a given geometry, the characteristic equation can be solved numerically to produce the complete k- beta diagram. The k- beta diagram for an infinite helical geometry having tape radius 1.0 m, core radius 0.8 m, substrate relative permittivity 1.0, and tape pitch angle 10 degrees is shown. The ratio of tape width to period along the axial direction is 1.0*10/sup -5/.<>
Keywords :
antenna radiation patterns; antenna theory; dielectric-loaded antennas; 0.8 m; 1.0 m; antenna radiation patterns; characteristic equation; concentric conducting core; dielectric substrate; dielectric-loaded antennas; infinite helical geometry; k- beta diagram; propagation constant beta; substrate relative permittivity; tape helical antennas; tape period; tape pitch angle; tape width; Antenna theory; Antennas and propagation; Broadband antennas; Dielectric substrates; Electromagnetic propagation; Equations; Geometry; Helical antennas; Propagation constant; Surface waves;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134697
