Title :
A quadrifilar helical antenna printed on a dielectric prism
Author :
Nakano, H. ; Sakai, M. ; Yamauchi, J.
Author_Institution :
Coll. of Eng., Hosei Univ., Koganei, Japan
Abstract :
A quadrifilar helical antenna (QHA) is analyzed using the FDTD method. The four arms of the QHA are printed on a dielectric prism backed by a ground plane. The thickness of the prism is given as B=(1-r AFRR) c/2 with rAFRR being the air-filled region ratio. It is found that the radiation pattern and gain obtained by a QHA whose arms are wound in free space (rAFRR=1) are reproduced by a QHA whose arms are wound on a reduced-size prism of rAFRR=0. The input impedance and gain as a function of rAFRR are evaluated. In addition, the beam direction as a function of the ground plane size is revealed
Keywords :
antenna radiation patterns; antenna theory; electric impedance; finite difference time-domain analysis; helical antennas; microstrip antennas; FDTD method; air-filled region ratio; antenna gain; beam direction; dielectric prism; ground plane size; input impedance; printed antenna; quadrifilar helical antenna; radiation pattern; Antenna radiation patterns; Arm; Dielectrics; Finite difference methods; Helical antennas; Impedance; Polarization; Solids; Time domain analysis; Wounds;
Conference_Titel :
Microwave Conference, 2000 Asia-Pacific
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6435-X
DOI :
10.1109/APMC.2000.926105
