Title :
A cavity-backed quadrifilar-curl antenna
Author :
Zainud-Deen, S.H. ; Mahmoud, K.R. ; Shaalan, A.A.M. ; Ibrahem, Sabry M M
Author_Institution :
Fac. of Eng., Menoufia Univ., Egypt
Abstract :
A quadrifilar-curl antenna is numerically analyzed in the presence of a flat circular reflector and a circular cavity. Wire grid method is used to simulate the conducting surfaces. The current distribution along the antenna structure is determined by using the moment method. The radiation pattern, polarization pattern, axial ratio, input impedance, VSWR, and the antenna gain of quadrifilar-curl antenna backed by a circular reflector and by a cavity is calculated using theoretically determined current distribution. The circular plate and the cavity enhance the antenna gain (8.17 dB for plate and 8.45 dB for cavity). The circular cavity improves the axial ratio in all planes around the antenna.
Keywords :
antenna feeds; antenna radiation patterns; current distribution; electric impedance; electromagnetic wave polarisation; method of moments; wire antennas; 8.17 dB; 8.45 dB; antenna gain; antenna structure; axial ratio; cavity-backed quadrifilar-curl antenna; circular cavity; conducting surfaces; current distribution; flat circular reflector; input impedance; moment method; polarization pattern; radiation pattern; wire grid method; Antenna radiation patterns; Antenna theory; Current distribution; Dipole antennas; Electromagnetic wave polarization; Moment methods; Optical polarization; Reflector antennas; Wire; Wireless communication;
Conference_Titel :
Radio Science Conference, 2003. NRSC 2003. Proceedings of the Twentieth National
Print_ISBN :
977-5031-75-3
DOI :
10.1109/NRSC.2003.1217313
