Title :
Theoretical and experimental investigations on focusing properties of the Fresnel zone lens and plate
Author :
Yamauchi, J. ; Nakano, H.
Author_Institution :
Coll. of Eng., Hosei Univ., Tokyo, Japan
Abstract :
the In this article, we discuss focusing properties of conducting and dielectric cylinders on the basis of the Fresnel zone principle. The radiation patterns when the cylinders are excited with an isotropic source are evaluated using the boundary element method. Helix antennas combined with a Fresnel zone plate are also reported. Enhanced gain characteristics are experimentally demonstrated.
Keywords :
antenna radiation patterns; boundary-elements methods; focusing; helical antennas; lens antennas; zone plates; Fresnel zone lens; Fresnel zone plate; boundary element method; conducting cylinders; dielectric cylinders; focusing properties; gain characteristics; helix antennas; isotropic source excitation; radiation patterns; Antenna radiation patterns; Boundary element methods; Dielectrics; Electromagnetic scattering; Engine cylinders; Fresnel reflection; Helical antennas; Lenses; Permittivity; Tellurium;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1999. IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-5639-x
DOI :
10.1109/APS.1999.789422
