![]() ![]() ![]() Next, in order to validate our simulation, we use another electromagnetic simulator CST MWS (Computer Simulation Technology-MicroWaves Studio) which is based on the finite integration method. The design and optimization have been performed using the simulator HFSS (High Frequency Structure Simulator) based on the finite element method. The insertion of slots in the structure of the patch antenna array has a direct and positive impact on improving the radiation characteristics in terms of reflection coefficient, voltage standing wave ratio, input impedance and gain over a frequency range of 2 í µí°ºí µí°»í µí± § to 3 í µí°ºí µí°»í µí± §. This array is connected in parallel with a microstrip line in the form « T » having a power port adapted to 50 Ω and intended for Radio Frequency Identification applications. In this paper, we propose to study and optimize a new structure of a patch antenna linear array to four identical elements. The following figure shows the layout of the input impedance of our geometry (Figure. The impedance matching would optimize the transfer of electric power between a source and a load. Thus, this value proves that the port of the antenna is properly matched. A high VSWR means the port is not properly matched. This is considered a good value as the level of mismatch is not very high. As can be observed from the graph, the VSWR obtained is 1.03 for a frequency of 2.38 GHz. We mentioned in section 2 of this paper that a VSWR is a measure of impedance mismatch. Figure 13 shows the voltage standing wave ratio (VSWR) for the rectangular patch antenna using coaxial feed method at our design frequency of 2.4 GHz. This means that the reflected power is minimal and therefore it will have a positive impact on increasing the level of the power transmitted by the RFID reader antenna. observe that the return loss at the input of the patch antenna reaches the level of -34.42 dB (at a resonance frequency of 2.38 GHz) with a bandwidth of 2.6% (the difference between 2.34 GHz and 2.40 GHz). ![]()
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