DocumentCode :
815182
Title :
FDTD-PWS Scheme and Its Application to Analysis of Focusing Properties of Dielectric Lens
Author :
Zhang, Yan ; Lü, Shan-Wei ; Zhang, Jun ; Miao, Jungang ; Fang, Ning ; Wang, Bao-fa
Author_Institution :
Sch. of Electron. & Inf. Eng., Beijing Univ. of Aeronaut. & Astronaut., Beijing
Volume :
57
Issue :
5
fYear :
2009
fDate :
5/1/2009 12:00:00 AM
Firstpage :
1442
Lastpage :
1451
Abstract :
The focusing properties of lens are studied by a hybrid scheme that involves the finite-difference time-domain (FDTD) method for the aperture-plane field computation and the plane wave spectrum (PWS) method for the transformation from the aperture-plane field to the focal-plane field. To demonstrate the accuracy and efficiency of this new scheme, a Ka-band lens antenna is simulated and fabricated as an example. Subsequently, the near-field-region and the Fresnel-region fields of this lens antenna are measured by the planar-near-field (PNF) method. It is found that the results obtained by the FDTD-PWS scheme are in good agreement with the measured data. Furthermore, the numerical results and the computational requirements of this new scheme are compared with those of the near-field to near-field (NF-NF) transformation, the aperture integration (AI) method, the geometrical optics (GO)-physical optics (PO) method, and the full FDTD simulation. Both the central processing unit (CPU) time and memory requirement can be reduced efficiently. Finally, the effects of several fundamental issues, including spatial sample parameters, lens material, operating frequency, and designed focal length, on the accuracy of the proposed scheme and on the focusing properties of the lens are investigated.
Keywords :
aperture antennas; finite difference time-domain analysis; focusing; lens antennas; FDTD-PWS scheme; Ka-band lens antenna; aperture-plane field computation; dielectric lens; finite-difference time-domain method; focusing properties; plane wave spectrum; Antenna measurements; Apertures; Central Processing Unit; Computational modeling; Dielectrics; Finite difference methods; Geometrical optics; Lenses; Optical computing; Time domain analysis; Finite-difference time-domain (FDTD) methods; lens antennas; millimeter wave antennas; plane wave spectrum (PWS) methods;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2009.2016719
Filename :
4909465
Link To Document :
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