[天线]Miniaturization of dual frequency RFID antenna with high frequency ratio

Kin Seong Leong ; Mun Leng Ng ; Cole, P.H. ; Ko<:Z)PS  
Univ. of Adelaide, Adelaide jp%S3)  
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This paper appears in:  Antennas and Propagation Society International Symposium, 2007 IEEE 0 1rK8jX  
Issue Date :  9-15 June 2007 03X1d-  
On page(s): 5475 - 5478 >y7?-*0  
Print ISBN: 978-1-4244-0877-1 k(nW#*N_  
References Cited: 6 `Y$4 H,8L  
INSPEC Accession Number: 9888340 E<Y$>uKA  
Digital Object Identifier :  10.1109/APS.2007.4396787 GR_-9}jQP  
Date of Current Version :   06 十二月 2007 L,/%f<wd  
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Abstract $bR~+C  
We have presented a novel design for dual frequency RFID antenna with high frequency ratio. This antenna works well in both the HF and UHF bands for RFID operation with a single feed. Comparisons between the new design and the previous design are made and the new design is shown to be less than half of the size of the previous design while offering almost the same performance. A functioning dual frequency RFID tag proves that having a dual frequency RFID system is feasible. Although no dual frequency RFID chip is available at the moment, we hope that this success .. "%w u2%i  
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Jung-Chin Hsieh ; Ming-Iu Lai ; Shyh-Kang Jeng ; 4o[{>gW  
Nat. Taiwan Univ., Taipei c]!V'#U  
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This paper appears in:  Antennas and Propagation Society International Symposium, 2007 IEEE k8zI(5.>
 
Issue Date :  9-15 June 2007 6Z"X}L,*  
On page(s): 309 - 312 Y.p;1"  
Print ISBN: 978-1-4244-0877-1 {)sdiE  
References Cited: 4 =rdV ]{Wc  
INSPEC Accession Number: 9887209 A.w.rVDD  
Digital Object Identifier :  10.1109/APS.2007.4395492 l*G[!u  
Date of Current Version :   06 十二月 2007 }O p; g^W  
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Abstract p4Z(^+Aa  
A passive RFID antenna for multi-layered printed circuit board (PCB) is proposed in this paper. At present most conventional RFID tags cannot be easily attached to a PCB, because the complicated metal planes and wires on a PCB may degrade seriously the radiation properties of RFID tags. The deterioration will greatly reduce the available read distance. Therefore, we propose an RFID antenna fabricated on PCB. Two slots are created on the power and ground planes and the RFID chip is connected over the slot on the ground plane. To get better power transmission between an antenna and a chip and to re-radiate back more power, the conjugate matching method is adopted to design the RFID antenna. According to simulation results, the available read distance is about 18 cm and the size is 30 mm by 20 mm. The small size enhances its use in PCB applications. vnuN6M{  
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