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Three different UHF RFID tag antennas are designed and fabricated. The reading ranges of tags are 1.7m, 1.9m and 0.85m. The first tag antenna used the transmission line, and the second tag antenna used a shorted patch antenna. The third antenna used the transmission line and L shape patch antenna to match the impedance of the tag antenna to the conjugate of chip impedance.
Anodes of aluminum electrolytic capacitor, which requires large surface area for a high capacitance, are prepared with electrochemical etching. Ultrasound contributes to the increase of etch pit density by prohibiting anodic oxide film formation and induces uniform tunnel length distribution by enhancing the transport of corrosion product, AlCl 3 , present inside etch tunnels. Compared to...
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