1、Super-wideband Antenna Technologies for Next Generation Mobile Systems,Student: Jianjun Liu Student ID: 41646975Supervisor:Karu. P. EsselleCentre for Microwave and Wireless Applications, Electronics Engineering, Macquarie University, NSW 2109, Australia,jianjun.liumq.edu.au,Outline,IntroductionAnten
2、na requirementAntenna development and Case studyProposed extremely wideband antenna for wireless communication SystemsConclusion,Wireless Communication System,-41.3 dBm/MHz maximum power level for UWB,GPS (1.571.58 GHz)WCDMA (1.922.17 GHz)Bluetooth (2.4-2.48GHz) WLAN 802.11b/g (5.15-5.825) WLAN802.1
3、1b/g (2.4-2.4835)Wi-max (3.3-3.6GHz)Commercial UWB (3.110.6 GHz)Vehicle UWB radar system(22-29GHz),Examples for existing communication standard,Examples for multi-band wireless system,Cellar system (GSM, Bluetooth, CDMA, USMT),Wireless Local Area Network,UWB through wall image operation (0-960MHz) C
4、ommercial UWB, localization precision(3.110.6 GHz) vehicle UWB radar system(22-29GHz),Antenna Requirement,Key component Antenna performance,Proposal A: multiple antennas are implemented Each one covers a specific operation spectrum. Disadvantage:Occupy much space for other device Increase the system
5、 complexity. The installation may restrict the system updating possibility after manufacture. Proposal B: Utilize single antennaAntenna bandwidth can cover more than one operating frequency bands of multiple wireless communication systemsSuch antenna should have stable radiation-pattern characterist
6、ics over entire frequency range.,Lodges biconical antennas (1898),Carters improved match biconical antennas (1939),Antenna Development,The antennas are bulky and too heavy for portable device,Equiangular spiral antenna (1959),log-periodic dipole antenna(1960),The movement of the effective radiating
7、region with frequency results in waveform distortion of a transmitted pulse,Metal-plate Monopole Antennas,Ratio impedance bandwidth: 13:1 Frequency range :0.8-10.5GHz,J.A. Evans and M.J. Ammann. “Planar trapezoidal and pentagonal monopoles with impedance bandwidths in excess of 10:1 C,” IEEE Antenna
8、s Propagat. Symp., vol.3, pp. 1558-1561, July, 1999.,Frequency range :1.38-11.45GHz Ratio Impedance bandwidth: 8.3:1,The perpendicular ground plane leads to antennas with high profiles which is inconvenience for integrating with monolithic microwave integrated circuits (MMIC).,Kin-Lu Wong, Chih-Hsie
9、n Wu, and Saou-Wen Su, “Ultrawide-Band Square Planar Metal-Plate Monopole Antenna With a Trident-Shaped Feeding Strip, ” IEEE Trans. Antennas Propagation, vol.53, pp1262-1269, April, 2005.,Microstrip-feed Printed Monopole Antenna,J. Liang, Choo C. Chiau, X.D. Chen, et al. “Study of a Printed Circula
10、r Disc Monopole Antenna for UWB Systems” J.IEEE Trans. Antennas Propag., 2005, 53(11):3550-3554.,Impedance bandwidth ratio : 3.52:1 Frequency range :2.78-9.78GHz,CPW-fed Printed Monopole Antennas,Impedance bandwidth ratio : 4.4:1 Frequency range : 2.73-12GHz,J. Liang, L. Guo, C.C. Chiau, X. Chen and
11、 C.G. Parini. Study of CPW-fed circular discmonopole antenna for ultra wideband applicationsJ.IEE Proc.-Microw. Antennas Propag.,2005,152(6):520-526.,Disc,Elliptical patch,Discone,Trapezoid ground plane,Coaxial-feeding line,CPW feeding line,Complanation Transform from Discone Antenna,S.-S. Zhong, X.
12、-L. Liang and W. Wang, “Compact elliptical monopole antenna with impedance bandwidth in excess of 21:1,”IEEE Trans. Antennas Propagation, vol.55, pp. 3080-3085, November, 2007.,Performance for antenna with Trapezoid Ground Plane,tapered,trapeziform,Elliptical,Performance Comparison between different
13、 printed antenna,Characteristic Mode Analysis for Printed Antenna,K. D. Akkerman, T. F. Kennedy, S. A. Long, and J. T. Williams, Characteristic modes for planar structure feed design, in Antennas and Propagation Society International Symposium, 2005 IEEE, 2005, pp. 503-506 vol. 2B.,Characteristic Mo
14、de Analysis for Printed Antenna,Modified Coplanar waveguide-fed elliptical monopole,The feeding terminal affect the high frequency impedance matching,With height and width of patch increased, the lowest limit decrease and ratio bandwidth increase,Modified Coplanar waveguide-fed elliptical monopole,M
15、odified Coplanar waveguide-fed elliptical monopole,Gap is a crucial parameter, The gap variation will affect the impedance bandwidth of whole spectrum,Substrate: Rogerspermitivity:3.48，thickness:1.5mm。,Dmax,H,a,b,Measured bandwidth: 1.02-24.1 GHz, ratio bandwidth:23:1,Modified Coplanar waveguide-fed
16、 elliptical monopole,Maximum gain: 7.2dBGain decrease：1 substrate loss 2 radiation shifting,Smith chart,Modified Coplanar waveguide-fed elliptical monopole,With the frequency increasing, cross polarization increased. Reverse current lead to pattern distortion and horizontal current lead to cross pol
17、arization enhanced.,Modified Microstrip-fed printed monopole,Based on modified CPW-fed printed monopole, two modified microstrip-fed monopole are proposed,Modified Microstrip-fed printed monopole,Measured bandwidth: 1.08-27.4 GHz, ratio bandwidth:25:1,Top side,Modified Microstrip-fed printed monopol
18、e,Back side,E Plane H Plane,E Plane H Plane,f=1.5GHz (b) f=5GHz (c) f=10GHz (d) f=15GHz(e) f=20GHz,Modified Microstrip-fed printed monopole,Modified Microstrip-fed printed monopole,Maximum gain: 6.5 dBGain variation between 4-20 GHz: 2.5 Db,Original proposed antenna Measured bandwidth: 0.85-25 GHz,M
19、odified Microstrip-fed printed monopole,Modified Microstrip-fed printed monopole,Measured bandwidth: 0.76-35.2 GHz, ratio bandwidth:46:1,Modified Microstrip-fed printed monopole,Top side,Back side,E Plane H Plane,E Plane H Plane,f=1.5GHz (b) f=5GHz (c) f=10GHz (d) f=15GHz(e) f=20GHz,Radiation shifti
20、ng is small,Modified Microstrip-fed printed monopole,Maximum gain: 8.3dB, gain increases in the whole spectrum,Modified Microstrip-fed printed monopole,Conclusion,Three new configuration of monopole antenna for wireless applicationsFour Techniques can enhance BW:1 tapered Microstrip-feeding line2 trapezoid ground plane3 optimized radiation patch4 semicircular feeding branch terminal,Thanks!,
