| Summary: | This article describes the design of an Ultra-High Frequency (UHF) miniature folded dipole Radio Frequency Identification (RFID) tag antenna that can be mountable on metallic objects. The compact tag antenna is formed from symmetric C-shaped resonators connected with additional arms embedded into the outer strip lines for miniaturization purposes. It is loaded with outer strip lines, resulting in a flexible tuning method that is capable of matching the integrated circuit (IC) chip’s impedance. The proposed tag is fabricated on a single layer of Polytetrafluoroethylene (PTFE) substrate. It has simple structure and does not require any metallic vias or shorting plate. The miniature tag antenna with a size of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>82.75</mn> <mo>×</mo> <mn>19.5</mn> <mo>×</mo> <mn>1.5</mn> <mtext> </mtext> <msup> <mrow> <mrow> <mi>mm</mi> </mrow> </mrow> <mn>3</mn> </msup> </mrow> </semantics> </math> </inline-formula> yields a total realized gain of <inline-formula> <math display="inline"> <semantics> <mrow> <mo>−</mo> <mn>0.53</mn> <mrow> <mtext> </mtext> <mi>dB</mi> </mrow> </mrow> </semantics> </math> </inline-formula> at the resonance frequency when attached to a <inline-formula> <math display="inline"> <semantics> <mrow> <mn>40</mn> <mo>×</mo> <mn>40</mn> <mtext> </mtext> <msup> <mrow> <mrow> <mi>cm</mi> </mrow> </mrow> <mn>2</mn> </msup> </mrow> </semantics> </math> </inline-formula> metal plate. The presented design utilizes a European RFID band, and the simulated results of realized gain, read range, and input impedance are verified with measurement results.
|
|---|
