| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 101 === This thesis proposes a conformal antenna for RFID metal tag. In many applications, RFID tags need to attach to different radius of the cylindrical metallic objects. However, the bending effect will cause severed frequency shifts and the impedance mismatch. Therefore, we propose a compensation mechanism to reduce bending effects. For smoothly attaching to bending objects, the substrate of the proposed antenna chose a 0.4mm-thickness FR4 substrate backed by a 1.1mm-thickness foam layer and a ground plane. The antenna does not have any shorting pins or walls. Chip, feeding network and the radiating body are placed on the top of FR4 substrate. The chip connected to a loop to provide a high inductance impedance, and it coupled to the radiator body to achieve impedance matching between the antenna and chip. The radiating body embedded an annular rectangular slot, and radiator coupling energy to the parasitic patch. This structure provides the inductive effect to reduce the impact of the antenna resonance frequency shift caused by bending from the metal surface . The structure can let the antenna maintain good impedance matching. The measured results show that the resonant frequency of the proposed antenna remain almost unchanged in different scenarios, such as placed on the plane or attached to different radius of cylindrical objects. The design details of antenna and experimental results are discussed in detail in the thesis.
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