This paper presents the results of a coplanar-waveguide (CPW)-coupled-fed elliptical monopole UWB antenna (CCFEMUA) with a dual band-notched characteristic. The antenna has a large bandwidth covering the frequency band from 2.4 GHz to 152 GHz with the return loss larger than 10 dB. Two band notches at 3.7GHZ and 4.8 GHz are realized by cutting two half-elliptical-arc slots on the radiation patch The return loss, radiation pattern, peak gain and efficiency of the antenna are studied using computer simulation.published_or_final_versio

Cheung, SW

Yuk, TI

Zhang, J

HKU Scholars Hub

Title CPW-coupled-fed elliptical monopole UWB antenna with dual-band notched characteristicAuthor(s) Zhang, J; Cheung, SW; Yuk, TICitationThe 2012 Progress In Electromagnetics Research Symposium(PIERS 2012), Kuala Lumpur, Malaysia, 27-30 March 2012. InProgress in Electromagnetics Research Symposium, 2012, p.823-827Issued Date 2012URL http://hdl.handle.net/10722/165221Rights Creative Commons: Attribution 3.0 Hong Kong LicenseProgress In Electromagnetics Research Symposium Proceedings, KL, MALAYSIA, March 27–30, 2012 823CPW-coupled-fed Elliptical Monopole UWB Antenna withDual-band Notched CharacteristicJ. Zhang, S. W. Cheung, and T. I. YukDepartment of Electrical and Electronic EngineeringThe University of Hong Kong, Hong Kong, ChinaAbstract— This paper presents the results of a coplanar-waveguide (CPW)-coupled-fed el-liptical monopole UWB antenna (CCFEMUA) with a dual band-notched characteristic. Theantenna has a large bandwidth covering the frequency band from 2.4GHz to 152GHz with thereturn loss larger than 10 dB. Two band notches at 3.7GHZ and 4.8GHz are realized by cuttingtwo half-elliptical-arc slots on the radiation patch The return loss, radiation pattern, peak gainand efficiency of the antenna are studied using computer simulation.1. INTRODUCTIONThe FCC (Federal Communications Commission) released an unlicensed frequency band of 3.1–10.6GHz for ultra-wideband (UWB) applications in 2002 [1]. Since then design of UWB antennashas been attracting much attention. UWB commonly refers to signals or systems that either have alarge relative or a large absolute bandwidth [2]. Such large bandwidth offers specific advantages oflow power consumption and high data rate which promise solutions for short-range and high-speedindoor mobile communications. The design of UWB antennas is quite challenging because it has tosatisfy the requirements of wide impedance bandwidth, omnidirectional radiation pattern, constantgain, high radiation efficiency, constant group delay, low profile and easy manufacturing [3]. Besidesthese, the UWB antennas should also have notch characteristic to prevent interfering with othersystems using frequency bands with the UWB.UWB antennas with different radiator shapes such as square [4], circular [5], pentagonal [6],hexagonal [7], elliptical [8], ring [9] and trapezoidal [10], different types such as monopoles [6–8, 10–12], dipoles [13] and slot antennas [9], different feeding structures such as microstrip [6, 7, 10, 11],co-planar-waveguide (CPW) [8, 9, 12] and coaxial [14], and different methods for creating the band-notched characteristics have been studied [8, 15, 16]. In this paper, we propose a very simple designof a CPW-coupled-fed elliptical monopole UWB antenna (CCFEMUA) with dualband notchedcharacteristic The two band notches are achieved by cutting two arc slots on the radiator. Thereturn loss, radiation pattern, peak gain, and efficiency are studied using the EM simulation toolCST.2. ANTENNA DESIGNThe configuration of the proposed dualband notched CCFEMUA is shown in Fig. 1. The antennais composed of a feeding structure on one side of the substrate and a radiating patch on the otherside of it. The antenna is designed in a substrate with a dielectric constant of εr and thickness ofh. The radiating patch has a simple elliptical shape with the major and minor axes having lengthsof 2rx and 2ry in the y and z directions, respectively. The feeding structure is a CPW terminatedwith a trapezium patch with a topline of w3, baseline of w2 and height of d as shown in Fig. 1. Thetrapezium patch is used to couple the signal from the CPW to the radiating patch on the otherside of the substrate. The width of the CPW tapers from w1 to w2 for achieving good impedancematch. Two notch bands at 3.7GHz and 4.8GHz are generated by cutting two half-elliptical-arcslots on the radiating patch as shown in Fig. 2. The lower arc slot in Fig. 2(a) and upper arc slotin Fig. 2(b) are responsible for the notch bands at 3.7GHz and 4.8GHz, respectively.3. RESULTS AND DISCUSSIONSThe proposed dual-band notched CCFEMUA is optimized in terms of impedance bandwidth usingthe EM simulation tool, CST The simulated return loss in Fig. 3 show that the antenna has animpedance bandwidth (return loss > 10 dB) from 2.4 to 15.2GHz, covering the bandwidth from3.1–10.6GHz for UWB applications. The two notch bands are created at 3.7GHZ and 4.8GHz.The simulated radiation patterns of the antenna in the x-y, x-z and y-z planes at 2.4, 3.0, 3.7,4.8, 10.0 and 15.2GHz are shown in Fig. 4. Due to the wavelength is much larger than the antenna824 PIERS Proceedings, Kuala Lumpur, MALAYSIA, March 27–30, 2012size at 2.4 and 3.0GHz, the patterns in the x-y plane are approximately omnidirectional. Theradiation patterns in the x-z and y-z planes are approximately symmetrical along the y-axis. Asthe electrical length of the radiator increases at the higher frequencies of 10GHz and 15.2GHz, theradiation patterns in the y-z plane are still symmetrical along the y-axis, but side lobes appear.The radiation patterns in the x-z plane become asymmetrical because the front (with the feed-linestructure) and back (with the radiator) of the antenna structure are not symmetrical. At the notchfrequencies of 3.7GHz and 4.8GHz, it can be seen that the peak gains are suppressed by about 6and 5 dB, respectively, compared to that at 3GHz.The simulated peak gain and efficiency of the antenna are shown in Fig. 5. It can be seenthat there are two notches occurring at the notched frequencies of 3.7 and 4.8GHz, with the gainsY Z X X Z Y εr X Z Y (a) (b) (c)Figure 1: Geometry of antenna. (a) Front view, (b) back view and (c) side view. εr = 3.5, h = 0.8mm,rx = 18mm, ry = 15mm, w1 = 2.2mm, w2 = 1.5mm, w3 = 11.5mm, d = 4mm, dg = 1mm, a = 33mm,b = 40mm, c = 17mm, d = 18.7mm.(a) (b)Figure 2: Half-elliptical-arc slots with large scale Dimensions of (a) lower slot with h1 = 6.7mm, θ1 = 185◦,rx1 = 10.5mm, ry1 = 5mm, rx2 = 9.9mm, ry2 = 4.4mm, and (b) upper slot with h2 = 7.7mm, θ2 = 155◦,rx3 = 9mm, ry3 = 5mm, rx4 = 8.4mm, ry4 = 4.4mm.2 4 6 8 10 12 14 1650403020100Return loss (dB)Frequency (GHz) Dual band notched CCFEMUAFigure 3: Return loss.Progress In Electromagnetics Research Symposium Proceedings, KL, MALAYSIA, March 27–30, 2012 825-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol(a)(i)(h)(g)(f)(e)(d)(c)(b)-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol(l)(k)(j)-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol(o)(n)(m)826 PIERS Proceedings, Kuala Lumpur, MALAYSIA, March 27–30, 2012(r)(q)(p)-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-pol-40-30-20-1000306090120150180210240270300330-30-20-100 Co-pol X-polFigure 4: Simulated radiation patterns. 2.4GHz in (a) x-y, (b) x-z and (c) y-z plane; 3GHz in (d) x-y,(e) x-z and (f) y-z planes; 3.7GHz in (g) x-y, (h) x-z and (i) y-z planes; 4.8GHz in (j) x-y, (k) x-z planeand (l) y-z planes; 10GHz in (m) x-y, (n) x-z plane and (o) y-z planes; 15.2GHz in (p) x-y, (q) x-z planeand (r) y-z.2 4 6 8 10 12 14 16-6-4-20246Peak Gain (dB)Frequency (GHz)2 4 6 8 10 12 14 160.00.20.40.60.81.0EfficiencyFrequency(GHz)(a) (b)Figure 5: Efficiency and peak gain. (a) peak gain, (b) efficiency.suppressed to −5 dBi and 0.1 dBi and radiation efficiencies reduced to 10% and 60%, respectively.4. CONCLUSIONSThe design of a CCFEMUA with a dual band-notched characteristic has been presented. Theantenna is simple and has a CPW-coupled-fed structure with an elliptical patch for radiation.Two half-elliptical-arc slots are cut on the radiator to generate two band notches at 3.7GHz and4.8GHz. Simulation results have shown that it has a wide operation bandwidth of 2.4–15.2GHzand approximately omnidirectional radiation patterns, and so is suitable for UWB applications.REFERENCES1. Federal Communications Commission, First Report and Order, Revision of Part 15 of theCommission’s Rules Regarding Ultra-wideband Transmission Systems, FCC 02-48, Apr. 2002.2. Schantz, H., The Art and Science of Ultra Wideband Antennas, Artech House Inc., 2005.3. Ghavami, M., L.B. Michael, and R. Kohno, Ultra Wideband Signals and Systems in Commu-nication Engineering, John Wiley and Sons, New York, USA, 2004.4. Ojaroudi, M., C. Ghobadi, and J. Nourinia, “Small square monopole antenna with invertedT-shaped notch in the ground plane for UWB application,” IEEE Antennas and WirelessPropagation Letters, Vol. 8, 728–731, 2009.5. Chiaw, C. C. and M. R Kamarudin, “Novel design of circular UWB antenna,” Asia PacificMicrowave Conference, Singapore, 1977–1979, 2009.6. Shrivastava, V. and Y. Ranga, “Ultra wide band CPW-fed printed pentagonal antenna withmodified ground plane for UWB applications,” IET International Conference on WirelessMobile and Multimedia Networks, 1–2, Beijing, China, 2008.7. Panda, J. R. and R. S. Kshetrimayum, “A compact CPW-fed hexagonal 5GHz/6GHz band-notched antenna with an U-shaped slot for ultrawideband communication systems,” Interna-tional Conference on Signal Processing and Communications, Bangalore, India, 1–5, 2010.Progress In Electromagnetics Research Symposium Proceedings, KL, MALAYSIA, March 27–30, 2012 8278. Weng, Y. F., S. W. Cheung, and T. I Yuk, “Compact ultra-wideband antennas with singleband-notched characteristic using simple ground stubs,” Microwave and Optical TechnologyLetters, Vol. 53, No. 3, Mar. 2011.9. Azim, R., M. T. Islam, and N. Misran, “Printed circular ring antenna for UWB applica-tion,” International Conference on Electrical and Computer Engineering, 361–363, Dhaka,Bangladesh, 2010.10. Lee, S. H., J. K. Parka, and J. N. Lee, “A novel CPW-fed ultra-wideband antenna design,”Microwave and Optical Technology Letters, Vol. 44, No. 5, Mar. 2005.11. Nazli, H., E. Bicak, B. Turetken, and M. Sezgin, “An improved design of planar ellipticaldipole antenna for UWB applications,” IEEE Antennas and Wireless Propagation Letters,Vol. 9, 264–267, 2010.12. Zhang, Z. C., C. J. Guo, J. Ding, and Y. Su, “A novel printed UWB monopole antenna fedby coaxial cable,” International Conference on Microwave and Millimeter Wave Technology,25–27, 2010.13. Chu, Q.-X. and Y.-Y. Yang, “A compact ultrawideband antenna with 3.4/5.5GHZ dual band-notched characteristics,” IEEE Transactions on Antennas and Propagation, Vol. 56, No. 12,3637–3644, Dec. 2008.14. Eshtiaghi, R., J. Nourinia, and C. Ghobadi, “Electromagnetically coupled band-notched ellip-tical monopole antenna for UWB applications,” IEEE Transactions on Antennas and Propa-gation, Vol. 58, No. 4, 1937–1402, Apr. 2010.15. Weng, Y. F., W. J. Lu, S. W. Cheung, and T. I. Yuk, “UWB antenna with single or dual-band notched characteristic for WLAN band using meandered ground stubs,” LoughboroughAntennas & Propagation Conference, 767–760, Nov. 2009.16. Weng, Y. F., S. W. Cheung, and T. I. Yuk, “An antenna for UWB and bluetooth standards withband-notched characteristic,” International Conference on Ultra-wideband, 170–174, Sep. 2009.

CPW-coupled-fed elliptical monopole UWB antenna with dual-band notched characteristic

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CPW-coupled-fed elliptical monopole UWB antenna with dual-band notched characteristic

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