Available online at www.ciencedirect.com Procedia Engineering 3 (01) 354 360 I-SEEC011 A Corner Reflector Antenna on Slot Antenna Driven for.45 GHz Wirele LAN Sytem K. Chaiyawong, J. Phelawan, N. Pornuwancharoen Nano photonic reearch group (NPRG), Department of electrical engineering, Faculty of Indutry and Technology, Rajamangala Univerity of Technology Ian, Sakon Nakhon Campu, Sakon Nakhon, 47160, Thailand Elevier ue only: Received 30 September 011; Revied 10 November 011; Accepted 5 November 011. Abtract We preent new deign the contruction of a corner reflector antenna on lot antenna driven to be ued on wirele LAN ytem. The gain of antenna ytem i more than 13 db with narrow beam width and the radiation pattern can be broadcating long ditant. The VSWR in reult are abolutely for antenna ytem radiation pattern from ingle lot antenna at.4 GHz. 011 Publihed by Elevier Ltd. Selection and/or peer-review under reponibility of I-SEEC011 Open acce under CC BY-NC-ND licene. Keyword: Corner reflector; Wirele LAN Sytem; Slot Antenna; Antenna Sytem 1. Introduction A corner reflector antenna on lot antenna driven for.45 GHz wirele LAN ytem have concept of lot antenna aaembly,alot antenna arrangement for portable peronal computer, broadband microtripfed lot radiator, tudy of coupled lot antenna fed by microtrip line, -band lot antenna for.4/5. GHz WLAN operation,.4/5-ghz dual-band triangular lot antenna with compact operation and Broadband dual-frequency cro-haped lot cpw-fed monopole antenna for WLAN operation [1-7]. The antenna ytem have dual-broadband rectangular-lot antenna for.4/5-ghz wirele communication, Dual-frequency annular-ring lot antenna fed by CPW feed and microtrip line feed, Compact PCB monopole antenna for UWB application, planar monopole UWB antenna with 5-GHz band-notched characteritic, rectangular lot with a novel triangle ring microtrip feed for UWB application, Wideband circular patch antenna with -pin loading for wirele communication, Numerical analyi of a mall ultra wideband microtrip-fed tap monopole antenna and a imple broadband printed antenna [8-15] Furthermore, the antenna ytem i a imple, eaily deign, making it more commercially viable. * Correponding author. E-mail addre: h4pjo@hotmail.com, phelawan_138@hotmail.com, jeewuttinun@gmail.com. 1877-7058 01 Publihed by Elevier Ltd. doi:10.1016/j.proeng.01.01.179 Open acce under CC BY-NC-ND licene.
K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 355 In thi paper, we preent the theoretical background in the phyical model, where deign can be ue to.4 GHz for wirele LAN ytem deign by lot antenna and reflector antenna. In application, the high effective radiation.. Theorem for Deign In thi paper application for antenna deign with refection pattern le than normal antennal, o that the corner reflector important to ue the 90 degree of inner building how in Fig. 1 However, the corner have the infinite extent for the parameter L i reflector path, i driven-to-corner, i angle of reflector and D a i width of pattern. Fig. 1. Show the ide view for corner reflector how Fig. and driven-to-corner pacing i 1/ Fig.. Shown pattern of quare-corner reflector antenna with driven-to-corner pacing of 1 and 1.5. Pattern give gain relative to the 1/ driven (dipole antenna) in free pace with the ame power input Driven or Feed element for corner reflector i uually placed 1/ Driven and parallel with vertex with ditance and if you need a wideband driven mut be of good conductor with diameter growth. Electric field analyi a a reult of the pread in the angle of the flat reflector 90 Corner reflector (=90 ) how in Fig. 3 and
356 K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 l l Image # Feed element x z r h y Image #3 Image #4 D a corner reflector Fig. 3. Structural integrity of corner reflector and Image of Corner reflector In the electric field at the point of reference i jkr e Er,, cokin co cokin inf, (1) r and 0 0 () and electric field of the 1/ driven (dipole antenna) in free pace i jkr e E0 f, (3) r The lot antenna are popular omni-directional microwave antenna. Thee antenna feature omnidirectional gain around the azimuth with horizontal polarization. Waveguide lot antenna, uually with an array of lot for higher gain like Fig. 4, are ued at frequencie from to 4 GHz A thin lot in an infinite ground plane i the complement to a dipole in free pace. Thi how that the lot will have the ame radiation pattern a a dipole with the ame dimenion a the lot, except that the E- and H-field are wapped, a illutrated in Fig. 4, the lot i a magnetic dipole rather than an electric dipole. A a reult, the polarization i rotated 90º, o that radiation from a vertical lot i polarized horizontally. For intance, a vertical lot ha the ame pattern a a horizontal dipole of the ame dimenion and we are able to calculate the radiation pattern of a dipole. Thu, a longitudinal lot in the broad wall of a waveguide radiate jut like a dipole perpendicular to the lot.
K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 357 Fig. 4. Show the baic of lot antenna A half-wavelength of tranmiion line ha the ueful property of repeating impedance: the input and output impedance are the ame. A a reult, the impedance, or admittance, of all the lot appear in parallel. Figure 7-6 how thi chematically. Each parallel reitor repreent one lot, o there mut be N reitance in parallel. The center of the lat lot i a guide quarter-wavelength from the cloed end of the waveguide. We know that a hort-circuited quarter-wavelength tub of tranmiion line appear a an open-circuit, o that the cloed end doe not affect the impedance. Sometime the cloed end i paced ¾ g for mechanical reaon; the additional half wavelength i tranparent. Fig. 5. Schematic of waveguide lot antenna The lot are fed in phae by pacing their center at electrical half-wavelength interval along the waveguide. The electrical wavelength in waveguide i longer than in free pace, o we mut calculate the guide wavelength: 1 g (4) 1 1 0 c where C, the cutoff wavelength, equal time the wide dimenion of the waveguide. And A imple way to etimate the gain of a lot antenna i to remember that it i an array of dipole. Each time we double the number of dipole, we double the gain, or add 3 db. Thu, a 16 lot array would have a gain of about 1 dbd. The approximate gain formula i thu Gain = 10log(N) db, for N total lot. Since it i really the vertical aperture of the lot rather than jut the number of lot that determine the for gain and vertical beamwidth formula:
358 K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 and Gain N lotpacing 10log db (5) 0 0 Beamwidth 50.7 degree (6) N lotpacing where N i the total number of lot and lotpacing i normally half the guide wavelength. The beamwidth formula i the ame a a uniformly illuminated aperture the length of the lot array, and i the narrowet poible beamwidth for the aperture dimenion. Later, we hall ee that a tapered aperture illumination can increae beamwidth and reduce idelobe level without ignificantly reducing gain. 3. Reult of experiment Fig. 6. Front of lot antenna Fig. 6 Back of lot antenna Fig. 6. (c) Ditance feed point and SWR tuning point in lot antenna
K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 359 Fig. 7. hown Structure and the ratio of the lot antenna ued in the experiment Meaured radiation pattern from ingle lot antenna at.4 GHz hown in Fig. 7. The pattern of lot antenna. pattern of ingle lot antenna etup lot antenna Fig. 8. meaured radiation pattern from ingle lot antenna at.4 GHz Fig. 9. Meaured radiation pattern from A Corner Reflector Antenna on Slot Antenna Driven for.45 GHz Wirele LAN Sytem in = 0.5, 0.5 and 0.8 Azimuth Elevation
360 K. Chaiyawong et al. / Procedia Engineering 3 (01) 354 360 4. Concluion A corner reflector antenna on lot antenna driven for.45 GHz wirele LAN ytem created to upport the wirele LANytem and ued between building to building and ervice area. Thi paper ue to effectively hould be intalled of the lot antennaradiation corner reflectori0.8to 1.0. The lot Antenna ha bigget and we can tune SWR for lot antenna with optimization. TheSWR i le than 1.5:1 for radio communication. A corner reflector antenna on lot antenna driven for.45 GHz Wirele LAN ytemcan be ue fortandard acce point and do not increae amplifier for acce point. The reult can be ued very good radiation ditance i 1.8 km and can be very good value at a ditance 300 meter. Acknowledgement The author are within the Nano Photonic Reearch Group (NPRG), Rajamangala Univerity of Technology Ian, Sakhon-Nakon Campu. Reference [1] Yai, S. N., H. H. Hin, H. K. Dai, and K. T. Cheng, Arcuate Slot Antenna Aembly, US Patent No. 6373443, 00. [] Snowdon, R. A., Slot Antenna Arrangement for Portable Peronal Computer, U. S. Patent No. 5677698, 1997. [3] Axelrod, A., M. Kiliuk, and J. Maoz, Broadband microtrip-fed lot radiator, Microwave Journal, 1989,1:81 84. [4] Akhavan, H. G. and D. M. Syahkal, Study of coupled lot antenna fed by microtrip line, The 10th International Conference on Antenna and Progagation, 1999,190 19. [5] Su, C. M., H. T. Chen, F. S. Chang, and K. L. Wong, Dual-band lot antenna for.4/5. GHz WLAN operation, Microwave and Optical Technology Letter, 00,35: 306 308. [6] Wu, J. W.,.4/5-GHz dual-band triangular lot antenna with compact operation, Microwave andoptic al Technology Letter, 005,45:81 84. [7] Liu, C. W., Broadband dual-frequency cro-haped lot cpw-fed monopole antenna for WLAN operation, Microwave andoptic al Technology Letter, 005,46:353 355. [8] Hiao, H. M., J. W. Wu, and Y. D. Wang, Novel dual-broadband rectangular-lot antenna for.4/5-ghz wirele communication, Microwave andoptic al Technology Letter, 005,46:197 01. [9] Chen, J. S., Dual-frequency annular-ring lot antenna fed by CPW feed and microtrip line feed, IEEE Tranaction on Antenna andpr opagation, 005,53:569 571. [10]. Ren, W., J. Y. Deng, and K. S. Chen, Compact PCB monopole antenna for UWB application, Journal of Electromagnetic Wave andapplic ation, 007,1:1411 140. [11] Ren, W., Z. G. Shi, and K. S. Chen, Novel planar monopole UWB antenna with 5-GHz band-notched characteritic, Journal of Electromagnetic Wave andapplic ation, 007,1:1645 165. [1] Geran, F., G. Dadahzadeh, M. Fardi, N. Hojjat, and A. Ahmadi, Rectangular lot with a novel triangle ring microtrip feed for UWB application, Journal of Electromagnetic Wave and Application, 007,1:387 396. [13] Almutairi, A. F., S. F. Mahmoud, and N. A. Aljuhaihi, Wide-band circular patch antenna with -pin loading for wirele communication, Journal of Electromagnetic Wave and Application, 005,19: 839 851. [14] Eldek, A. A., Numerical analyi of a mall ultra wideband microtrip-fed tap monopole antenna, Progre In Electromagnetic Reearch, PIER, 006,65:59 69. [15] Gao, S. and A. Sambell, A imple broadband printed antenna, Progre In Electromagnetic Reearch, PIER, 006,60:119 130,