A Broadband Design of Uhf Fractal Rfid Tag Antenna

Abstract

Abstract-In this paper a broadband radio frequency identification (RFID) tag antenna for the ultrahigh-frequency (UHF) band is designed. The proposed antenna consists of a first-order Hilbert fractal structure and a spiral structure. In order to ensure the conjugate matching between the tag antenna and the electronic chip, a T-matching structure is employed. The interaction between two radiating elements makes the proposed antenna a fractional bandwidth of 20% over the frequency range of 820 MHz-1010 MHz and a small size of 0.2092λ 0 × 0.099λ 0 . Simulated and measured results validate the good performance of the designed tag antenna.

Design and Evaluation of a Planar I-Shaped Folded-Patch Antenna for Compact Passive Uhf Rfid Tags to Cohere on Metal

“…Many designed methods for on-metal tags have been proposed to reduce the influence of the metal. For example, effective solutions are composed of increasing the distance between the tag and the surface of the metal object [1], folding the dipole arm into multiple parts [2], etc. Another way is to introduce an artificial magnetic conductor (AMC) [3,4] or electromagnetic bandgap (EBG) [5] structures, both of which are capable of isolating the antenna from its backing metal.…”

A Novel Compact Antenna for Passive UHF RFID Tag Using π-Match and Meander Techniques

“…The input impedance of the RFID chip must be conjugately matched with that of the antenna impedance to accomplish maximum most extreme power exchange [3]. In the available literature, several passive RFID tag antenna structures [4][5][6][7][8][9] have already been proposed.…”

“…For handy applications, RFID tag antennas must be compact, suitable for low-cost and reasonable for ease large scale manufacturing [13] and must also have specific antenna impedance. Many papers presented in the literature provided different techniques for reducing the size of the antenna, such as meandering, fractal, inverted-F, or Split Ring Resonators (SRR) structures [14][15][16][17], and other for the impedance matching, such as T-match network [18], double T-matching structure [19] and inductively coupled loop [20].…”

Folded-Slot Active Tag Antenna for 5.8 GHZ Rfid Applications

“…An active RFID tag IC has a 50 Ω input impedance for which the active RFID tag antenna needs to be matched with a 50 Ω microchip. In the available literature, several passive RFID tag antenna structures [5][6][7][8][9][10][11][12] and active RFID tag antenna structures [13][14][15][16][17][18][19][20][21] have already been proposed. They include a meander line antenna [5], in which nonuniform meandering is used for antenna size miniaturization and gain optimized by means of a genetic algorithm.…”

“…In [9], a circularly polarized loop antenna is proposed for the UHF band with an input impedance of 13.5 + j111 Ω whereas in [10] a square microstrip antenna is proposed for the 2.45 GHz band with an input impedance of 50 Ω. In [11,12], antennas with a first-order Hilbert fractal design are proposed for microwave/UHF band RFID applications. An inverted-F antenna for X-band active RFID applications has been devised in [10].…”