DocumentCode :
2832520
Title :
Radiation of a patch antenna on a finite substrate
Author :
Borselli, L. ; Maci, S. ; Capece, P. ; Votta, M.
Author_Institution :
Dept. of Electr. Eng., Florence Univ., Italy
Volume :
2
fYear :
1996
fDate :
21-26 July 1996
Firstpage :
1062
Abstract :
The radiation pattern of patch antennas may considerably be affected by the finiteness of the substrate, especially when surface waves are strongly excited. In particular, the correct prediction of the diffraction contributions from the edges of the finite substrate is relevant when the patches are printed on free standing structures, in which the front-to-back ratio has to be maximized. A high-frequency solution is presented for the field radiated by a patch current distribution located upon a rectangular, grounded dielectric slab. The typical values of thickness and dielectric constant used in patch antennas suggest the effective use of a physical optics (PO) approximation, which consists of estimating the radiating equivalent currents distributed on the surface and in the volume of the entire finite slab, like those induced by the source in the infinite structure. The technique developed by Borselli, Maci and Rossi (see MMET ´94, Kharkov, Ukraine, 1994) is applied to find the radiation of a patch on a finite substrate. By using a proper GTD ray tracing, the canonical solution is applied to the case of a dipole on a finite, rectangular grounded slab. Next, by integrating the contributions of each element of a current distribution, the radiation of a patch on a finite substrate is modeled.
Keywords :
antenna radiation patterns; approximation theory; current distribution; dipole antennas; geometrical theory of diffraction; microstrip antennas; permittivity; physical optics; ray tracing; GTD ray tracing; antenna radiation pattern; current distribution; dielectric constant; dipole; edge diffraction; equivalent currents; finite substrate; front to back ratio; high frequency solution; patch antenna; physical optics approximation; radiated field; rectangular grounded dielectric slab; surface waves; thickness; Antenna radiation patterns; Current distribution; Dielectric constant; Dielectric substrates; Diffraction; Optical surface waves; Patch antennas; Physical optics; Slabs; Surface waves;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Society International Symposium, 1996. AP-S. Digest
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-3216-4
Type :
conf
DOI :
10.1109/APS.1996.549779
Filename :
549779
Link To Document :
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