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1 : RFID RFID 1,2, 1,2, 2 ( ; ) : U HF M Hz M Hz, E F,, E, 850 M Hz 920 M Hz, (VSWR < 2) E F,, :RFID ; IFA ; ; : TN82 :B : X(2009) Design of Novel Dual2frequency Microstrip Patch Antenna f or RFID Application ZHAO Wannian 1,2,WU Yueshan 1,2,L IU Yichang 2 (1. School of Information Science & Technology,Northwest University,Xi an,710127,china ; 2. Invengo Information Technology Co. Ltd.,Shenzhen,518057,China) Abstract :A new method based on E2shaped antenna and inverted F antenna is developed in order to meet requirement of M Hz and M Hz in China. The novel antenna is designed in this paper. The antenna resonance is realized by adjusting the position of the short2pin,the slot width and relative distance of E2shaped. The result s of simulation and test show that this new antenna operates at 850 M Hz and 920 M Hz. The bandwidth defined by VSWR < 2 can meet the regulation re2 quirement s in China. Besides,muti2f requency of E2shaped antenna and lower back lobe of inverted F antenna are embodied by the antenna. Besides,the antenna has simple struct,cheap cost and tuning conveniently. Keywords : RFID ; IFA ;microstrip antenna ;dual2f requency resonance 0 ( Radio : Frequency Indentification ), [1 ] RFID [2 ], [ 3,4 ], RFID RFID, U HF RFID M Hz M Hz [5 ] M Hz M Hz,,,, M Hz M Hz,,,, E F ( IFA), 850 M Hz 920 M Hz, VSWR = 1. 09, (VSWR < 2) 2 mm FR4,,, 1 F E 1. 1 F F ( IFA),, 1 IFA,,,, IFA, IFA

2 g g,, IFA [6 ] IFA (7),, H, IPFA, L, ; H, E E 1 IFA [8 ], L S [ 8 ], F ( PIFA), 2 L C, L C d ν H, Z0 [ 7 ], E : L C L C Z0 = ( 0 / ) ln H/ d + H 2 / d 2-1 λ 120ln (2 H/ d), (1) 2, E IFA, 3 [ 9, 10 ], : 2 F ( PIFA) (1) : 0 = 120, : Zin = Z0 ZL Z0 + j Z0 tan L + j ZL tan L (2) : (2) L S, : X L = - Z0 cot L, X S PIFA : Xin X S X L, : (2) = Z0 tan S (3) Zin = Rin + j Xin (4) Xin = 120ln (2 H/ d) sin S cos L cos ( S + L), [ 8 ], : Rin = 30 ( K H) (5) sin 2 S + cos 2 L - cos ( S + L) cos L sin S cos 2 ( S + L) S (6) L = / 4, (6) 0,, : Rin = 30 ( K H) 2 (7) W = c 2 f ( r + 1 ) - 1/ 2 (8) 2 : W ;c ; f ; r, : 3 g/ 2, g : g = c/ f r (9) L = c/ 2 f e - 2 L (10) (10), L : e = 1 + r + r h W - 1/ 2 (11) 141

3 : RFID L = ( e ) ( W / h ) :, (12) h ( e ) ( W / h ), ; : e ; h, (8) (12) W L, ;,,, FDTD Ansoft HFSS 10. 0,, ( a ), 850 M Hz, M Hz VSWR = 1. 09, (VSWR < 2) M Hz M Hz, U H F 4 (b) (e), 850 M Hz 920 M Hz,, 3 U H F RFID M Hz M Hz, 850 M Hz 920 M Hz, ( VSWR < 2) M Hz M Hz, 4 1 mm W L H S l w L 2 L , E IFA, 2 mm, 4. 6 FR4, [1 ],,. [ M ]. :,2008. [2 ] Bansal R. Coming Soon to a Wal2Mart Near You [J ]. IEEE Antennas Propagation Magazine,2003,6 (45) : [3 ] Finkenzeller K. RFID Handbook [ M ]. New York : Wiley & Son,2000. [ 4 ] Want R. An Introduction to RFID Technology[J ]. IEEE Pervasive Computing,2006 : [5 ],,. U HF [J ].,2008,31 (9) : [ 6 ] Iulian Rosu. PIFA2Planar Inverted F Antenna [ EB/ OL ]. ht2 tp :/ / www. qsl. net/ va3jul. [7 ],,. PIFA [J ].,2008,31 (9) : [8 ]. [ M ]. :,2006. [9 ]. [ M ]. :,1993. [10 ]. [ M ]. :, [11 ],. HFSS E [ A ]. Ansoft 2005 [ C ] : ,1980,,, EDA,, RFID

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