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Abstract
In this paper two proposed methods of input impedance calculation for Bow-Tie antenna are introduced. The proposed methods show input impedance calculation with high accuracy. Also, design curves for input impedance values were developed depending on the geometry of antenna. The proposed design curves are used to design a Bow-Tie type RFID tag antenna. The input impedance of the tag antenna is calculated using proposed methods and compared with that obtained using CST studio suite 2014 and IE3D Zeland version 12.0 software packages. The results are investigated and discussed. The tag antenna is fabricated, measured and the obtained input impedance is compared with the simulation and the proposed methods. Good agreement among measured input impedance and that simulated by CST, IE3D or proposed methods is obtained.
Highlights
Radio Frequency Identification (RFID) system consists of reader and tag
In order to achieve a good performance and low power consumption, chip impedance should be correctly matched to tag antenna
Modified Bow-Tie Antenna Design and Results: The proposed modified shape Bow-Tie antenna is shown in Figure 19, As stated in section 3 that bandwidth of conventional bow-tie antenna is so narrow to covers RFID band, we decided to insert slots on bow-tie antenna so as to increase it’s bandwidth
Summary
RFID system consists of reader and tag. The reader interrogates the tags via a wireless link to obtain the data stored on the tags. The aforementioned literatures indicate that, in the recent few years, a great effort was made and good results were obtained where the antenna was matched to a 50 Ohm input impedance but the main problem will arise when a complex matching is needed This problem arises clearly in the design requirements of UHF tag antenna. The paper is organized as follows: Section 2 gives the Bow-Tie antenna input impedance calculation as in the published literatures, namely quasi-static method, tapered transmission line method and biconical approximation method It includes the proposed analytical and graphical methods.
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