| Summary: | 碩士 === 義守大學 === 電機工程學系 === 89 === This study applies three dimensional Finite Difference Time Domain (FDTD) method to simulate and analyze microstripline-fed rectangular patch antenna. The result shows that, by increasing the metal thickness, the resonant frequency of the patch antenna decreases. Consequently, when we use FDTD to simulate microstrip circuits, by omitting the metal thickness, it will introduce errors in the numerical calculation and affect the accuracy of the results.
The effects on patch antennas with different permittivity (er) and height of substrate (h) have been investigated. The results show that the resonant frequency reduces as the height of substrate and permittivity increase. As a whole, the permittivity is the strongest factor on patch antennas when use to determine the resonant frequency.
Antenna input impedance match is important to the transfer of power from a transmitter to an antenna. Maximum power transfer would not occur unless their impedance are matched. For a microstripline-fed rectangular patch antenna, impedance matching can be done by choosing different feed positions at the nonradiating edge of the patch antenna. In this study, the S11 characteristic is calculated while adjusting the microstripline along the nonradiating edge of the patch antenna to search for the optimal feed position. FDTD analysis is applied to model patch antennas for four different patch sizes while keeping Lp/Wp ratio constant. The results show good agreement between the measurement and simulation .
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