%0 Journal Article
%J International Journal of Electronics
%D 2005
%T Analysis of the Resonant Cavities Using the FDTD Scheme with Effective Permittivities Formulae
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%X An efficient expression of the effective permittivities along x-, y-, z-direction is obtained by analogy with the circuit concept of series-parallel connection of capacitance. Under the condition of numerical stability, the approximate formulae of effective permittivities for various inhomogeneous cell mesh are combined with the Finite Difference Time Domain (FDTD) scheme of arbitrary spatial cell size to calculate resonant frequency of 3-D cavity. The results are in agreement with that of conventional FDTD method, but the proposed method can save computing time and memory.
%B International Journal of Electronics
%I Taylor & Francis, London
%V 92
%P 393-399
%8 07/2005
%U http://www.informaworld.com/smpp/content~content=a714030080~db=all
%N 7
%R 10.1080/08827510412331294938
%0 Journal Article
%J Journal of Microwave
%D 2005
%T Application on the Microstrip Patch Array Antenna with the Electromagnetic Bandgap Structure
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%B Journal of Microwave
%8 01/2005
%0 Journal Article
%J International Journal of RF and Microwave Computed-Aided Engineering
%D 2005
%T A New FDTD Scheme Analysis of the Characteristics of the Magnetic-Anisotropic EBG Structure
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%X In this article, the new grid finite-difference time-domain (NG-FDTD) method is applied to calculate the dispersion curves of electromagnetic band-gap structures, and the dispersion characteristics of three magnetic-anisotropic medium EBG structure are obtained using the NG-FDTD method. According to these results, we can conclude that the EBG structure of a magnetic-anisotropic medium, in which the permeability of nondiagonal elements is real, has a much larger band-stop than that of isotropic EBG. Other magnetic-anisotropic EBG structures can also increase the first band-stop.
%B International Journal of RF and Microwave Computed-Aided Engineering
%I John Wiley & Sons
%V 15
%P 317-324
%8 05/2005
%U http://www3.interscience.wiley.com/cgi-bin/fulltext/110429938/PDFSTART
%N 3
%R 10.1002/mmce.v15:3
%0 Journal Article
%J International Journal of Infrared and Millimeter Waves
%D 2004
%T 35 GHz Patch Antenna Array Based on the Electromagnetic BandāGap Structure
%A X. L. Bao
%A X. W. Sun
%A Z. F. Li
%A W. Y. Bao
%A R. Qian
%X The electromagnetic bandgap (EBG) structure, also called photonic bandgap structure, consisted by triangular arrays of air columns on the dielectric structure is designed and studied by using the FDTD method. According to the simulated and measured results, the EBG structure effectively suppressing surface wave for TE and TM modes is designed. The optimized EBG structure is presented.The proposed EBG structure is applied to the fourelement microstrip patch array antenna. As results of simulation and measurements, the impedance bandwidth and the gain of proposed EBG patch array antenna are improved.
%B International Journal of Infrared and Millimeter Waves
%I Springer Netherlands
%V 24
%P 1799-1804
%8 12/2004
%U http://www.springerlink.com/content/r44r0852378n4202/?p=0e4c8a29aa2b420891d7e59bfe8d8fd1&pi=0
%N 12
%R 10.1007/s10762-004-0200-4
%0 Conference Paper
%B IEEE Asia Pacific Microwave conference
%D 2004
%T 4-Unit Patch Antenna Array Based on the Electromagnetic Bandgap Structure
%A X. L. Bao
%A X. W. Sun
%A Z. F. Li
%A W. Y. Bao
%A R. Qian
%B IEEE Asia Pacific Microwave conference
%I Institute of Electronic & Electrical Engineers
%C New Delhi, India
%8 15/12/2004
%0 Journal Article
%J Journal of Applied Sciences
%D 2004
%T An Approximate Expression of the Effective Permittivity In the Inhomogeneous Difference Unit Grid
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%B Journal of Applied Sciences
%0 Journal Article
%J Journal of Shanghai Jiaotong University
%D 2004
%T FDTD Analysis of Dispersion Characteristics of 2-D Dielectric Photonic Crystal Described By Effective Permittivity in Grid
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%B Journal of Shanghai Jiaotong University
%I Shanghai Jiaotong University, China
%8 10/2004
%0 Conference Paper
%B IEEE AP-S International Symposium on Antennas and Propagation
%D 2004
%T The Simple Derivation For the Effective Permittivities Formulae In the Finite Difference Grids
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%X In recently years, the finite difference time domain method (FDTD) has been the most popular numerical method in electromagnetic fields, such as for microwave circuit, antennas, etc. In order to deal with inhomogeneous dielectric in the interface, the usual method is to plot out the mesh along the interface in two kinds of dielectric (J.G. Maloney, and G.S. Smith, IEEE Microwave Guided Wave Lett., vol. 10, pp. 359-361, 2000), but this limits the size of the unit grid which is much smaller, and increases computation time. In this paper, by using analogy with the circuit concept of series-parallel connection of capacitance, the approximate formulae of effective permittivities for various inhomogeneous unit grids are deduced. Under the condition of numerical stability, these formulae are combined with the FDTD method of arbitrary spatial mesh to calculate frequency of the resonant cavity. This proposed method can save computing time and memory than the conventional FDTD method. These effective permittivities formulae will be applied in other difference methods for electromagnetic problem.
%B IEEE AP-S International Symposium on Antennas and Propagation
%I Institute of Electronic & Electrical Engineers
%C Monterey, CA, USA
%V 1
%P 89- 92
%8 20/06/2004
%U http://ieeexplore.ieee.org/iel5/9253/29352/01329560.pdf?tp=&isnumber=&arnumber=1329560
%R 10.1109/APS.2004.1329560
%0 Conference Paper
%B Cross Strait Tri-Regional Radio Science and Wireless Technology Conference
%D 2003
%T Calculation of the Effective Permittivity Approximate In the Difference Grid Based on a Simple Method
%A X. L. Bao
%A Z. F. Li
%A X. W. Sun
%B Cross Strait Tri-Regional Radio Science and Wireless Technology Conference
%C Qualin, China
%P 77-80