Abstract
In this study, the resonant frequency of annular ring microstrip resonator with uniaxial anisotropic substrate and air gap layer is analyzed. The cavity model for simple ring microstrip antenna is extended with some modifications for the tunable geometry taking into account the anisotropy in the layer. The theoretical resonant frequency results are in very good agreement with the experimental results reported elsewhere. The air gap tuning effect on the resonant characteristics is also investigated for fundamental and higher order modes.
Highlights
During the last three decades, a considerable number of papers have been published on the performance and applications of microstrip patch antennas
Because of their flexibility for producing dual frequency treatment [2] and advantages for using in medical applications [3] are interesting to many researchers
The obtained results show that when the permittivity ε z is changed and ε x remains constant, the resonant frequency changes drastically, on the other hand, we found a slight shift in the resonant frequency when the permittivity ε x is changed and ε z remains constant
Summary
During the last three decades, a considerable number of papers have been published on the performance and applications of microstrip patch antennas. Because of their flexibility for producing dual frequency treatment [2] and advantages for using in medical applications [3] are interesting to many researchers. This type of printed antenna can have a broader bandwidth than other shape of patch antenna by a proper choice of dimensions and the mode of operation. Because of these advantages several studies have been done on the annular ring patch antennas [2,3,4,5,6]. Several articles on ring patch on uniaxial substrates have been recently published [7,8,9]
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