Title :
Enhanced patch-antenna performance by suppressing surface waves using photonic-bandgap substrates
Author :
Gonzalo, Ramón ; De Maagt, Peter ; Sorolla, Mario
Author_Institution :
Univ. Publica de Navarra, Pamplona, Spain
fDate :
11/1/1999 12:00:00 AM
Abstract :
The microstrip patch antenna is a low-profile robust planar structure. A wide range of radiation patterns can be achieved with this type of antenna and, due to the ease of manufacture, is inexpensive compared with other types of antennas. However, patch-antenna designs have some limitations such as restricted bandwidth of operation, low gain, and a potential decrease in radiation efficiency due to surface-wave losses. In this paper, a photonic-bandgap (PBG) substrate for patch antennas is proposed, which minimizes the surface-wave effects. In order to verify the performance of this kind of substrate, a configuration with a thick substrate is analyzed. The PBG patch antenna shows significantly reduced levels of surface modes compared to conventional patch antennas, thus improving the gain and far-field radiation pattern
Keywords :
UHF antennas; antenna radiation patterns; dielectric materials; losses; microstrip antennas; microwave materials; photonic band gap; substrates; surface electromagnetic waves; PBG substrate; far-field pattern improvement; gain improvement; low-profile robust planar structure; microstrip patch antenna; patch-antenna performance enhancement; periodic dielectric material; photonic-bandgap substrates; radiation patterns; surface waves suppression; surface-wave losses; thick substrate; Crystalline materials; Dispersion; Electromagnetic propagation; Optical control; Optical materials; Optical surface waves; Patch antennas; Periodic structures; Substrates; Surface waves;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
