Title :
Performance Analysis of a Quadrifilar Helix Antenna Above the Ground Plane
Author :
Ghanevati, M. ; Daryoush, A.S. ; Hoorfar, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California State Univ., Fresno, CA
Abstract :
Design and performance evaluation of a modified quadrifilar helix antenna (QHA) above various terrains are investigated utilizing the method of moments (MoM). In particular, antenna performance above "average ground" plane with epsivtau=13 and sigma=5 mS/m and "extremely poor" ground that is common to heavy industrial cities having epsivtau=3 and sigma=0.1 mS/m is first considered as a base line. Two extreme cases of antenna orientation above the ground plane are considered and antenna modification method is presented to reduce the ground reflection effect. Simulated axial ratio of less than 0.3 dB is achieved along the antenna axis over 20% bandwidth operating in the cellular frequency band
Keywords :
antenna radiation patterns; method of moments; MoM; antenna modification method; antenna orientation; average ground plane; cellular frequency band; ground reflection effect; method of moments; quadrifilar helix antenna; Antenna radiation patterns; Artificial satellites; Helical antennas; Low earth orbit satellites; Mobile antennas; Moment methods; Performance analysis; Polarization; Reflection; Reflector antennas; Axial mode; Ground reflection; Image theory; Method-of-Moments; Multi-path effects; Quadrifilar helix antenna; Radiation pattern; Reflector;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351793
