Analysis and design of printed IFA for W HAN

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1 ( ) JOURNAL O F SOU THEAST UN IV ERS ITY (N atural Science Edition) V ol136 N o12 M ar F ( 1, ) ( , ) :,,W HAN., IFA,. IFA,,. IFA,, W HAN IFA., 214 GH z, M H z, GH z,.,,,. : ; F ; ; ; : TN 82 : A : (2006) Analysis and design of printed IFA for W HAN L iu Tong 1 Fan H ong 2 Shen L ianfeng 1 ( 1 N ational M obile Comm unication Research L aboratory, Southeast U niversity, N anjing , China) ( 2 U nit of Peop les L iberation A rm y, W ulum uqi , China) Abstract: S tarting w ith radio w ave p ropagation m echanism, the indoor depolarization phenom enon is analyzed, and the special antenna requirem ents of W HAN (w ireless hom e area netw ork) for po2 larization, radiation and im pedance m atch are researched. Proceed ing w ith the transm ission line theo2 ry, the analytic fo rm u la of the inp ut im pedance fo r the p rin ted IFA ( inverted F antenna) is educed, and the regu larity of its im pedance variation w ith its horizontal branch length is studied. B ased on the cu rren t distribution characteristic of each branch of the p rinted IFA, the analytic form ula of the radia2 tion electric field is derived, w hich p roves that the p rinted IFA has both isotrop ic rad iation and cross polarization characteristics. The im p acts of all the d im ension param eters on both input im pedance and resonant frequency of the p rin ted IFA are sim ulated, and the im pact regularity along w ith the antenna design m ethod is given as w ell, based on w hich a sm all size p rinted IFA fo r B luetoo th W HAN is de2 signed. The experim en tal results show that around 214 GH z w hen V SW R ( voltage stand ing w ave ra2 tio) is below 2. 0 the band w idth is about 490 M H z, w hich is enough for the GH z band of B luetoo th, and the m easured radiation patterns also testify further that the antenna has both i2 sotrop ic radiation and cross polarization characteristics. Furtherm ore, the antenna can be integ rated w ith B luetooth m odule, and varieties of B luetooth p roducts w ith the antennas are already in comm er2 cial usage, w hich has w on Science & Technology A dvancem ent Prize of J iangsu Province. Key words: W HAN; p rin ted IFA; cross polarization; isotrop ic rad iation; B luetooth : : (863)(2003AA 1Z1110) (BG ) (02171). : (1971 ),,,; ( ),,,, lfshen@ seu. edu. cn.

2 184 ( ) 36, [ 1 ],(W HAN ),.,,,.,,,.,,,., W HAN, W HAN F,. 1, H i ( 1), [ 2 ] H i + H r = H n (1) H i H r H n, E H [ 2 ] E H = e ( E H ) (2) EH e,, E H e, 1, E i, E r E n. ( ), W HAN (),. [ 3 4 ],,,,,. 2 W HAN 1) W HAN, (),,.,,,,. 2),,,.,, W HAN,,. 3) W HAN TDD, [ 5 ],,,, 210,., W HAN,,,,,. 3F 1 ( ) 3 F,, F,2 ( a).

3 2, :F 185 2F F 2 ( b), L S, d ν H, Z 0 [ 6 ] Z 0 = 0 ln H d + H 2 d ln 2H d, 0 = 120, (3) [ 7 ] X 1 = Z 0 tanks (4) X 2 = - Z 0 co tkl (5), k = 2 /,F Z IFA = R IFA + jx IFA (6),X IFA X 1 X 2, X IFA = X 1 / /X ln 2H d s inkscoskl cos k (S + L ) (7),, [ 8 ] F F R IFA = 30 ( kh ) sin 2 ks + cos 2 kl - cosk (S + L) coskl sinks ks cos 2 k(s + L) (8) L = /4,(7), 0,, (8) L = 2, kl = 4 4 = 2 coskl = 0, X IFA = X 0 = 0 R IFA = R 0 = 30 ( kh ) sin 2 ks cos 2 ( ks + /2) = 30 ( kh ) 2 (9) (10) R IFA, S, H, H. /4 L = ( /4 + ), R IFA R X IFA ln 2H d sin 2 ks - s ink sin 2 ks / ks s in 2 ks + 2s inkscoskssink s inkss ink s ink (S + ) SL, /4, (11) (12) sinks > 0, cosks > 0 (13) R IFA < R 0, X IFA > 0 (14) L, R IFA, X IFA 0,. /4 L = ( /4 - ), R IFA R (13) X IFA ln 2H d sin 2 ks + s ink sin 2 ks / ks s in 2 ks - 2s inkscoskssink s inkss ink sin k (S - ) (15) (16) R IFA > R 0, X IFA < 0 (17) L, R IFA, X IFA 0,.,, L,,,,. L,, H 50,.

4 186 ( ) F, [ 9 ]. L = /4, [ 10 ] ( 2 S L ) ( 2 H),. 2 ( c), E S +L = e cos cos + jexp j cos (18) 2 E H = - e cos cos + e s in (19) E to ta l = E S +L + E H = e cos - sin cos + jcos 2 2 cos + e s in p = E to ta l E 3 to ta l = 1 cos 2 cos cos + sin 2 2 cos + s in2 = (20) (21),,,W HAN. (20) E, E,, W HAN. 4F,,,,L 0,, [ 11 ] : = r 2 (22), 3 L, S H. 411, L,,,. S H,,,,S, H, L, 2,., H,,,. (), (). S,,,.,,,,. S,,,. [ 12 ] (1), [ 13 ] S., 3,,. fh L,S,. [ ]. 1 L H S 412 F, L, H S,,,,, 50,,. W HAN,, L H, 2145 GH z,, S, L H, L, H ] f > 2145 GH z, X IFA < 0 S] f < 2145 GH z, X IFA > 0 f = 2145 GH z, X IFA = 0 (23) ]

5 2, :F 187, S H, L, S, H ] R IFA < 50 L ] R IFA > 50 ] R IFA = 50 (24),, S [ 14 ]., H 5 mm, 2, S, H, L. (23) (24), L, S, 2 S = 3. 0 mm H = 5. 3 mm, L = 1811 mm, 3,, 50. FR 24,415, 016 mm, 110 mm. 90, , db 490 M H z, ISM : GH z.,2145 GH z 5, 2 ( c), 5 ( a) ( b) ( c) x2z y2z x2y.,, E x2y E y2z, W HAN. 4 IFA S /mm H /mm L /mm f /GH z (: mm ) 5 3,,50 50,, SM A ZV R E (RO HD E & SCHW A R Z, 9 kh z 4 GH z). 4, 214 GH z, GH z

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