应用于超宽带通信的贴片六边形单极子天线研究_英文_

应用于超宽带通信的贴片六边形单极子天线研究_英文_ 19 No14 Feb. 2009 Vo l 科 学 技 术 与 工 程 第 9卷 第 4期 20 09年 2月 Ζ Sc ience Techno logy and Enginee ring 1 Tech1Engng1 2009 Sc i( ) 1671 21819 2009420878 206 通信技术 应用于超宽带通信的贴片六边形单极子天线研究 李 栋石鑫 夏丰 () 北京航空航天大学电子信息 工程 路基工程安全技术交底工程项目施工成本控制工程量增项单年度零星工程技术标正投影法基本原理 学院电磁工程 实验室 17025实验室iso17025实验室认可实验室检查项目微生物实验室标识重点实验室计划 ,北京 100191 摘 要 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 了一种应用于超宽带通信的平面单极子天线 。天线由一个六边形辐射单元和一个部分接地板构成 。通过采用了一种新颖的馈电结构 ,有效地改善了阻抗带宽 。天线获得了优良的电气性能 ,包括较宽的阻抗带宽 、全向的辐射方向图 、平 稳增益及近似常数的群时延特性等 。仿真及实验结果得到了合理的一致 。 关键词 单极子天线超宽带 群时延 文献标志码 A 中图法分类号 TN821. 5; ( )tenna a re p e rfo rm ed u sing the comm e rc ia l comp u te r Since Federa l Communica tion Comm ission FCC ( ) re leased the extremely w ide spec trum 3. 1—10. 6 GHzfo 2 softwa re p ackage CST M ic rowave Stud io. M ea su rer comme rcial ultra2w ideband app lica tions in 2002, much m en ts of the an tenna a re a lso conduc ted fo r ve rifica tion effo rt ha s been paid fo r the design of UWB antenna s. In of the sim u la tion re su lts. o rde r fo r the antenna to be conside red fo r UWB app lica2 tions, it has to have a compac t p rofile, w ideband imped2 1 An tenna geom e try ance ma tching, omnidirectiona l radia tion pa tte rns and low dispe rsion of time doma in response. F ig. 1 show s the geom e try of the p ropo sed an ten2 V a riou s techn ique s have been sugge sted to im 2 Two beve ls w ith d im en sion s of W ×L a re p laced s s na. p rove the imp edance m a tch ing ove r a b road frequency the upp e r side of the ground p lane to ach ieve a on sp ec trum. Among the se de sign s, p lana r monopo le an2 b road bandw id th. A dd itiona lly, the an tenna p e rfo rm 2 tenna is one of the mo st p rom ising cand ida te s fo r UWB ance can be fu rthe r imp roved by u sing a tap e red m i2 [ 1 —8 ] app lica tion s. c ro strip line and a m a tch ing stub. The an tenna is p rin2 2fed hexagon a p lana r m ic ro strip In th is p ap e r, ted on a FR4 sub stra te w ith re la tive p e rm ittivity of 4. 4 monopo le an tenna w ith p a rtia lly mod ified ground p lane and lo ss tangen t of 0. 02. D im en sion s a re op tim ized is p re sen ted fo r UWB app lica tion s. The p ropo sed an ten2 ba sed on num e rica l re su lts and revea led in Tab le ?. na p rovide s b road imp edance m a tch ing, fla t ga in and nea rly om n id irec tiona l rad ia tion p a tte rn s ove r the UWB frequency sp ec trum. In add ition, tim e dom a in p e rfo rm 2 ance is stud ied and con stan t group de lay is ob ta ined. The sim u la tion and ana lysis fo r the p ropo sed an2 ( ) 04 F51070 、军工设备航空科学基金 2008 年 10 月 28 日收到 ( )预研基金 51407020105H K0129 资助 F ig. 1 Geom e try of the p ropo sed an tenna 第一作者简介 :李 栋 , E2m a il: leedongbuaa@163. com。 2 Pa ram e tr ic study F ig. 2 show s the m ea su red and sim u la ted re tu rn lo ss of th is an tenna. R ea sonab le agreem en t ve rifie s the sim u la tion re su lts of CST. The sm a ll d isc rep anc ie s m igh t be a ttribu ted to the effec t of SMA connec to r. The figu re a lso ind ica te s tha t the an tenna m a in ly ha s th ree re sonance s in the op e ra ting bandw id th c lo se to 3 , 5 and 8. 5 GH z. F ig. 2 M ea su red and sim u la ted re tu rn lo ss Ta b le 1 An tenna D im en s ion s in M ill im e ter s W W L L L L L L W W W L r h 1 s s g 1 2 3 4 2 3 30 37 8 1. 6 3 6 8 17 12. 3 4. 9 1. 3 0. 5 2 5. 6 Sim u la ted cu rren t d istribu tion s a t re sonan t fre2 quenc ie s a re p re sen ted in F ig. 3. A s show in the fig2 u re, the cu rren t is m a in ly d istribu ted a long the m ic ro s2 trip line and the edge of the hexagon p a tch. The hexa2 gon shap e in troduce s d iffe ren t cu rren t p a th s w ith d iffe r2 en t length s wh ich p roduce m u ltire sonance s and lead to [ 9 ] w ideband cha rac te ristic s. F ig. 4 illu stra te s the sim u2 la ted re tu rn lo ss fo r d iffe ren t r. It is no ticed tha t the first re sonan t frequency dec rea se s w ith the inc rea se of r. So the low frequency p e rfo rm ance of the an tenna can be effec tive ly imp roved by ad ju sting r. O n the ground p lane, the cu rren t is p rim a rily con2 cen tra ted on the upp e r edge, wh ich ind ica te s tha t the upp e r p a rt of the ground p lane ac ts a s a p a rt of rad ia ting [ 3 ] ha s an obviou s effec t on the comp u ted re tu rn lo ss. struc tu re. F ig. 5 p re sen ts the comp u ted re tu rn lo ss fo r Fo r monopo le an tenna, the ground p lane se rve s a s d iffe ren t ground p lane length L. It can be seen tha t L g g 880 科 学 技术 与 工 程9卷 3 Ra d ia t ion pa ttern s an d ga in In the UWB app lica tion s, an tenna s a re u sua lly de sired to have om n id irec tiona l rad ia tion cha rac te ris2 tic s. F ig. 7 p re sen ts the m ea su red and sim u la ted rad ia2 tion p a tte rn s of the p ropo sed an tenna a t 5 GH z in E2 and H 2p lane s. M ea su rem en t wa s conduc ted in a Com 2 ( ) p ac t A n tenna Te st R ange CA TR . A good agreem en t is no ticed excep t fo r som e ripp le s due to the effec t of in te rfe rence wave. Fig. 5 Sim ula ted re tu rn lo ss fo r d ifferen t ground p lane length L g [ 3 ] an imp edance m a tch ing c ircu it. Con sequen tly, two beve ls a re cu t on the ground p lane to tune the inp u t imp edance and hence the 10 dB re tu rn lo ss band2 [ 10 ] w id th. U n like conven tiona l monopo le an tenna s, the feed line of the p ropo sed an tenna con sists of a tap e red m ic ro strip line and a m a tch ing stub. The d im en sion s a re ad ju sted to m a tch 50 a t the inp u t po rt and op ti2 m ized ba sed on num e rica l re su lts. The sim u la ted re tu rn lo ss cu rve s of the p ropo sed an tenna w ith no rm a l m i2 c ro strip line of fixed w id th W and no beve l on the 1 ground p lane a re comp a red in F ig. 6. The re su lt show s the u ltra2w ideband cha rac te ristic is ach ieve by cu tting beve ls on the ground p lane and u sing tap e red m ic ro s2 trip line w ith m a tch ing stub. F ig. 7 M ea su red and simu la ted radiation pa tterns a t f = 5 GHz R ad ia tion p a tte rn s a re a lso sim u la ted a t 3 and F ig. 6 Sim u la ted re tu rn lo ss fo r p ropo sed an tenna w ith 8. 5 GH z in E2and H 2p lane s, re sp ec tive ly, a s shown in no rm a l m ic ro strip line and no beve ls on the ground p lane F ig. 8. Monopo le2like rad ia tion p a tte rn s a re ob se rved in the E2p lane wh ile H 2p lane p a tte rn s exh ib it good om n i2 d irec tiona l rad ia tion cha rac te ristic s. F ig. 8 Sim u la ted rad ia tion p a tte rn s a t 3 and 8. 5 GH z Comp u ted ga in is p lo tted in F ig. 9. R ea sonab le ga in fla tne ss is ach ieved w ith the va ria tion of le ss than 4 dB ove r the en tire op e ra ting band, wh ich is impo rtan t fo r UWB p u lse tran sm ission. Pho tograp h of the p ro2 po sed an tenna is p re sen ted in F ig. 10. 882 科 学 技术 与 工 程9卷 om n id irec tioa l and stab le rad ia tion cha rac te ristic s ove r the en tire frequency range. Con stan t group de lay is ob2 4 Group D e la y C ha ra c ter ist ic ta ined. Sim u la ted and m ea su red re su lts show a good a2 Group de lay is defined a s the nega tive de riva tive greem en t, wh ich ind ica te tha t the p ropo sed an tenna is of the p ha se re spon se w ith re sp ec t to frequency. It a good cand ida te fo r w ire le ss comm un ica tion app lica2 quan tifie s the p u lse d isto rtion and fa r fie ld p ha se line2 tion s. a rity. In the UWB system s, a stab le group de lay is de2 Referen ce s sirab le. F ig. 11 illu stra te s the m ea su red group de lay of 1 A bbo sh A M , B ialkow sk i M E. D e sign of u ltraw ideband p lanar mono2 the an tenna system s wh ich comp rise s a p a ir of iden tica l po le an tenna s of c ircu la r and e llip tical Shap e. IEEE Tran s A n tenna s p ropo sed an tenna s. The an tenna s a re po sitioned face to P rop ag, 2008; 56: 17 —23 face w ith a sep a ra tion of 0. 5m e te r. The m axim um va l2 H su Chengh sing. P lana r m u ltila te ra l d isc monopo le an tenna fo r UWB 2 app lica tion. M ic rowave Op t Techno l L e tt, 2007; 49: 1101 —1103 ue of m ea su red group de lay is abou t 1 n s w ith little va ri2 L iang J ianxin, Ch iau C C, Chen X iaodong, et a l. Study of a p rin ted a tion ove r the en tire op e ra ting band. 3 c ircu lar d isc monopo le an tenna fo r UWB system s. IEEE Tran s A n ten2 na s P rop ag, 2005; 53: 3500 —3504 R uvio G, Amm ann M J. A novel w ideband sem i2p lana r m in iatu rized 4 an tenna. IEEE Tran s A n tennas P rop ag, 2007; 55: 2679 —2685 W u Q i, J in Ronghong, Geng Junp ing, et a l. P rin ted om n i2d irec tiona l 5 UWB monopo le an tenna w ith very comp ac t size. IEEE Tran s A n tenna s P rop ag, 2008; 56: 896 —899 Chen Zh in ing, Terence S P S, Q ing X ianm ing. Sm a ll p rin ted u ltraw2 6 ideband an tenna w ith reducedground p lane effec t. IEEE Tran s A n ten2 na s P rop ag, 2007; 55: 383 —388 R ay K P, R anga Y, U ltraw ideband p rin ted e llip tica l monopo le an ten2 7 na s. IEEE Tran s A n tenna s P rop ag, 2007; 55: 1189 —1192 W u Xuanhu i, Kishk A A. Study of an u ltraw ideband om n id irec tiona l F ig. 11 M ea su red group de lay 8 ro lled monopo le an tenna w ith trap ezo ida l cu ts. IEEE Tran s A n tenna s P rop ag, 2008; 56: 259 —263 In th is p ap e r, a p lana r hexagon monopo le an tenna E ldek A A. U ltraw ideband doub le rhom bu s an tenna w ith stab le rad ia2 is de signed fo r h igh ra te, sho rt range w ire le ss comm u2 9 tion p a tte rn s fo r p ha sed array app lication s. IEEE Tran s A n tenna s n ica tion. To ob ta in b roadband cha rac te ristic, a nove l P rop ag, 2007; 55: 84 —91 feed ing struc tu re and p a rtia lly mod ified ground p lane is 10 Chongyu Hong, L ing Ch ing2we i, Ta rn I Y, et a l. D e sign of a p lana r p ropo sed. The an tenna cove rs the frequency a ssigned u ltraw ideband an tenna w ith a new band2no tch structu re. IEEE Tran s by FCC fo r u ltra2w ideband app lica tion and p re sen ts A n tenna s P rop ag, 2007; 55: 3391 —3397 Study of a Pr in ted Hexa gon M onopole An tenna for Ultra 2w ideband Appl ica t ion s L I Dong, SH I X in, X IA Feng ( )E lec trom agne tic Enginee ring L ab, B eihang U n ive rsity, B e ijing 100191 , P. R. Ch ina () [ A b stra c t] A p lana r monopo le an tenna is p ropo sed fo r u ltra2w ideband UWB app lica tion s. The an tenna con2 sists of a hexagon rad ia tion p a tch and a p a rtia lly mod ified ground p lane. A nove l feed ing struc tu re is p ropo sed to imp rove the imp edance bandw id th. P rom ising p e rfo rm ance s a re ach ieved, inc lud ing w ide imp edance bandw id th, fla t ga in, om n id irec tiona l rad ia tion p a tte rn s and con stan t group de lay. R ea sonab le agreem en t is ob ta ined be tween the sim u la tion s and m ea su rem en ts. ()u ltra2w ideband UWB [ Key word s] monopo le an tenna group de lay () 上接第 873页 S tudy on D am a ge L oca t ion of O il D err ick Ba sed on W a ve le t an d Neura l Ne t work ZOU Long2q ing, FU H a i2long, X IE Chun2q iang ( )Schoo l of M echan ica l Sc ience and Engineering, D aq ing Pe tro leum In stitu te, D aq ing 163318 , P. R. Ch ina [ A b stra c t] A cco rd ing to the p rob lem of single dam age loca tion of o il de rrick, the two2laye r B P neu ra l ne two rk is bu ild by the com b ina tion of wave le t and neu ra l ne two rk m e thod. The e igenvec to rs of no rm a lized ene rgy a re a s the neu ra l ne two rk’s inp u ting vec to rs, wh ich a re ob ta ined from the wave le t ana lysis. A fte r ne two rk tra in ing and sim u la2 tion te st, it is conc luded tha t the m e thod above ha s be tte r p rac ticab ility to iden tify single dam age loca tion of o il de r2 rick. The vib ra tion exp e rim en t bea ting the indoo r de rrick mode l w ith a hamm e r is comp le ted, wh ich show s tha t the dam age eva lua tion gu ide line ba sed on e igenvec to rs of no rm a lized ene rgy can ach ieve to iden tify dam age loca tion of o il de rrick we ll and tru ly. [ Key word s] o il de rrick wave le t ana lysis neu ra l ne two rk dam age