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Tapered circular microstrip antenna with modified ground plane

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Tapered circular microstrip antenna with modified ground plane Tapered circular microstrip antenna with modified ground plane Document Transcript

  • International Journal of Electronics and Communication Engineering & Technology (IJECET),ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME43TAPERED CIRCULAR MICROSTRIP ANTENNA WITH MODIFIEDGROUND PLANE FOR UWB COMMUNICATIONSMrs. Archana Agarwal1, Manish Kumar2, Priyanka Jain3, Shagun Maheshwari41(Electronics & Communication, Institute of Technology & Management, Bhilwara (Raj.), India)2(Electronics & Communication, Institute of Technology & Management, Bhilwara (Raj.), India)3(Electronics & Communication, Institute of Technology & Management, Bhilwara (Raj.), India)4(Electronics & Communication, Institute of Technology & Management, Bhilwara (Raj.), India)ABSTRACTThe recent allocation of the 3.1–10.6 GHz frequency spectrums for ultra-wideband(UWB) wireless communication by the Federal Communications Commission (FCC) haspresented various opportunities and challenges for antenna designers. This paper focuses onUWB technique of cutting a notch at the ground pattern opposite the microstrip line withrectangular tapered corners. The proposed UWB antenna is designed on 45 mm×30 mm×1.6mm substrate (FR-4 lossy) and simulated using CST software. Result shows that a slot in theground plane pattern beneath the microstrip line with the tapered corners and patch providesenhancement in bandwidth. With the optimized dimension of notch and feed line, 119.53%bandwidth is obtained ranging from 3.15GHz to 12.5GHz which satisfies the systemrequirements for S-DMB, WIBRO, WLAN, CMMB and the entire UWB.Keywords: Bandwidth, Microstrip Patch antenna, Tapering, Ultra wideband (UWB)I. INTRODUCTIONThe regulation for ultrawide band was officially released in 2002 by FederalCommunication Commission (FCC) and spectrum of 3.1-10.6GHz is allocated for this band[1]. Ultra-wideband (UWB) communication systems have the promise of very highbandwidth, reduced fading from multipath, Higher data rates over large bandwidth (BW) andlarge channel capacity, Less complexity and cost, Low power consumption. These featuresare desirable for both indoor and outdoor handheld UWB antenna applications. Radiatingelements patches of printed antennas have a variety of forms, as triangular, rectangular,square, elliptical, and circular, among others. However, it has been found that circularINTERNATIONAL JOURNAL OF ELECTRONICS ANDCOMMUNICATION ENGINEERING & TECHNOLOGY (IJECET)ISSN 0976 – 6464(Print)ISSN 0976 – 6472(Online)Volume 4, Issue 3, May – June, 2013, pp. 43-47© IAEME: www.iaeme.com/ijecet.aspJournal Impact Factor (2013): 5.8896 (Calculated by GISI)www.jifactor.comIJECET© I A E M E
  • International Journal of Electronics and Communication Engineering & Technology (IJECET),ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME44structures have smaller dimensions related with the operation frequency, Moreover, thecircular structure offers another important advantage: the only control variable for thestructure design is the patch radius, that is the reason circular or disk antennas are verypopular and widely used nowadays. In this Letter, we present another promising bandwidth-enhancement technique by providing the cutting slot in the ground plane pattern beneath themicrostrip line. It is possible to adjust the coupling between the antenna element and theground planeappropriately; thereby it is possible to widen the bandwidth. This method ismore effective than that of the use of an asymmetrical feed arrangement [2], a double feed[5], a bevelling radiating element [3], adjusting the gap between radiating element andground plane [4], abevelling ground pattern [6], and so on.II. ANTENNA DESIGNThis design focuses on the UWB circular shaped patch antenna. Firstly a simple circularshaped patch antenna is designed having radius of R=10mm with microstrip feedlinetechnique. It is fabricated on a 45 mm×30 mm×1.6 mm FR-4 (lossy) dielectric substrate(Dielectric constant εr=4.4, Loss tangent= 0.02)with a feed line and a finite ground plane.(a) Top View (b) Bottom ViewFig. 1 Geometry of Circular UWB antennaLater on cut a slot in ground plane beneath the microstrip feed line and tapered thecorners. Fig. 2 and 3show the measured return loss against frequency curve at different depthand width of slot in the ground pattern respectively. It can be see that the cutting slot depthhas effective impedance matching rather than the slot width as a gap between the radiatingelement and the ground plane.
  • International Journal of Electronics and Communication Engineering & Technology (IJECET),ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME45Fig.2 Measured Return Loss against frequency of circular UWB antenna with differentcutting slot depth in ground planet = 0.5mmt = 1.0mmt = 1.5mmFinally the top patch is modified along with the feedline dimension modifications toobtain the UWB properties. The optimized dimensions of ground plane as shown in figure 5.8are: W1=30m, L1=14mm, L2=2mm, W2=4mm, W3=5mm, W4=7.5mm, t=1mm. The topcircular shaped patch is cut as shown in figure 5.8. The dimensions of cut are C1=10mm,C2=9.5mm. The width and length of feedline is designed to be S1=3mm and S2=2.5mm. Fig.4 and 5 show the VSWR curve and smith chart of proposed circular UWB antenna.Fig.3 Measured return loss against frequency of circular UWB antenna with differentcutting slot width in ground planeW3 = 3.0mmW3 = 4.0mmW3 = 5.0mm
  • International Journal of Electronics and Communication Engineering & Technology (IJECET),ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME46Fig.4 Measured VSWR against frequency of circular patch UWB antenna with t = 1mmand W3 = 5mmFig.5 Smith chart of proposed circular UWB antennaIII. CONCLUSIONUltra wide band is rapidly advancing as a high data rate wireless communicationtechnology. In this article the circular tapered with modified ground plane antenna isdesigned. It is being observed that 119.53% Bandwidth is obtained ranging from 3.15GHz to12.5 GHz which is comparatively very large then the antennas previously designed by theresearchers.
  • International Journal of Electronics and Communication Engineering & Technology (IJECET),ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME47REFERENCES[1] First Report and Order (FCC 02-48). Action by the Commission February 14, 2002.New Public Safety Applications and Broadband internet access among uses envisioned byFCC authorization of Ultra-Wideband Technology[2] Ammann, M.J., and Chen, Z.N.: ‘An asymmetrical feed arrangement for improvedimpedance bandwidth of planar monopole antennas’, Microw. Opt. Technol. Lett., 2004, 40,pp. 156–158[3] Antonino-Daviu, E., Cabedo-Fabres, M., Ferrando-Bataller, M., and Valero-Nogueira,A.: ‘Wideband double-fed planar monopole antennas’, Electron Lett., 2003, 39, pp. 1635–1636.[4] Ammann, M.J., and Chen, Z.N.: ‘Wideband monopole antennas for multi-bandwireless systems’, IEEE Antennas Propag. Mag., 2003, 45, pp. 146–150[5] Floc’h, J.M., and Desclos, L.: ‘Surface-mounted monopole antenna’,Microw. Opt.Technol. Lett., 1997, 16, pp. 349–352[6] Wang, W., Zhong, S.S., and Chen, S.B.: ‘A novel wideband coplanar-fed monopoleantenna’, Microw. Opt. Technol. Lett., 2004, 43, pp. 50–52[7] Kishan Singh and Shivasharanappa N Mulgi, “Complementary-Symmetric CornerTruncated Compact Square Microstrip Antenna for Wide Band Operation”, InternationalJournal of Electronics and Communication Engineering &Technology (IJECET), Volume 1,Issue 1, 2010, pp. 99 - 106, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472.[8] M. Veereshappa and S. N. Mulgi, “Rectangular Slot Loaded Monopole MicrostripAntennas for Triple-Band Operation and Virtual Size Reduction”, International Journal ofElectronics and Communication Engineering &Technology (IJECET), Volume 4, Issue 1,2013, pp. 176 - 182, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472.[9] L. Lolit Kumar Singh, Bhaskar Gupta and Partha P Sarkar, “A Review on Effects ofFinite Ground Plane on Microstrip Antenna Performance”, International Journal ofElectronics and Communication Engineering & Technology (IJECET), Volume 3, Issue 3,2012, pp. 287 - 292, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472.