Title :
Ground plane effects on quadrifilar helix antenna phase center and radiation characteristics for GPS applications
Author :
Hussein, Z.A. ; Rengarajan, S.R.
Author_Institution :
Jet Propulsion Lab., Pasadena, CA, USA
Abstract :
Resonant quadrifilar helixes (QHs) have found applications in Global Positioning System (GPS) receiving antennas. Results of an investigation of QH antennas with shaped ground planes and their effects on the radiation pattern, input impedance, and phase center stability are presented. It is necessary to know the location of the phase center of the field radiated to a great precision in an application like GPS. The phase center has been determined by two methods: the tangent sphere technique and an optimization technique that minimizes the mean square error.<>
Keywords :
antenna radiation patterns; numerical analysis; optimisation; radionavigation; receiving antennas; satellite antennas; satellite relay systems; GPS; Global Positioning System; input impedance; mean square error; optimization technique; phase center stability; quadrifilar helix antenna; radiation pattern; receiving antennas; resonant antennas; shaped ground planes; tangent sphere technique; Antenna radiation patterns; Application software; Global Positioning System; Helical antennas; Impedance; Mean square error methods; Optimization methods; Polarization; Resonance; Stability;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.175159
