ScholarBank@NUShttps://scholarbank.nus.edu.sgThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sun, 08 Sep 2024 21:01:40 GMT2024-09-08T21:01:40Z5081- A new well-conditioned surface integral equation formulation for finite microstrip structureshttps://scholarbank.nus.edu.sg/handle/10635/68937Title: A new well-conditioned surface integral equation formulation for finite microstrip structures
Authors: Zhao, W.-J.; Li, L.-W.; Xiao, K.
Abstract: An efficient (well-conditioned) surface integral equation formulation is proposed for the scattering and radiation analysis of finite microstrip structures. The formulation on dielectric interface consists of weighted sums of the field integral equations corresponding to the external and internal dielectric regions with appropriate weighting coefficients. Discretization of the formulation by the moment method and the Galerkin's testing procedure can produce a matrix equation with good conditioning. Numerical results are presented to demonstrate the efficiency and accuracy of the proposed formulation. © 2010 IEEE.
Fri, 01 Jan 2010 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/689372010-01-01T00:00:00Z
- Effects of an electrically large airborne radome on radiation patterns and input impedance of a dipole arrayhttps://scholarbank.nus.edu.sg/handle/10635/55771Title: Effects of an electrically large airborne radome on radiation patterns and input impedance of a dipole array
Authors: Zhao, W.-J.; Gan, Y.-B.; Li, L.-W.; Wang, C.-F.
Abstract: A hybrid technique based on the image theory and integral equation coupled with physical optics approximation is employed to predict the effects of an electrically large three-dimensional dielectric radome on the radiation patterns and input impedance of a dipole array backed by a ground plane. With the hybrid technique, the interaction between the array and the radome is well considered. © 2007 IEEE.
Wed, 01 Aug 2007 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/557712007-08-01T00:00:00Z
- Efficient analysis of antenna radiation in the presence of airborne dielectric radomes of arbitrary shapehttps://scholarbank.nus.edu.sg/handle/10635/55787Title: Efficient analysis of antenna radiation in the presence of airborne dielectric radomes of arbitrary shape
Authors: Zhao, W.-J.; Li, L.-W.; Gan, Y.-B.
Abstract: A technique based on the surface integral equation is applied for the analysis of antenna radiation in the presence of an arbitrarily shaped dielectric radome terminated by a conducting surface. The equivalence principle is used to characterize the effect of the radome on the transmitted field in terms of equivalent surface electric and magnetic currents which radiate in an unbounded medium. A set of coupled integral equations involving these currents is obtained by using the boundary conditions on the tangential components of the total fields. The adaptive integral method is applied to solve the integral equations so that electrically large radomes can be analyzed. The radiation patterns of dipole arrays with dielectric radomes of superspheroidal shape are also presented. © 2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/557872005-01-01T00:00:00Z
- Efficient design of finite conformal antenna arrays using VSIE formulation and P-FFT methodhttps://scholarbank.nus.edu.sg/handle/10635/70103Title: Efficient design of finite conformal antenna arrays using VSIE formulation and P-FFT method
Authors: Xiao, K.; Li, L.-W.; Zhao, W.-J.; Chai, S.-L.; Mao, J.-J.
Abstract: A rigorous and effective analysis of finite conformal microstrip antenna array of arbitrary shape is presented using volume-surface integral equation (VSIE) formulation and Precorrected-fast fourier transform method (P-FFT) method where combined conducting and dielectric materials are considered. Three typical conformal arrays including cylindrical, spherical and conical arrays with thin dielectric sheets are considered. Microstrip-line and probe feed methods are used to excite the arrays.
Fri, 01 Jan 2010 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/701032010-01-01T00:00:00Z
- Coupled IE-PO method for analysis of antenna radiation patterns in the presence of a large 3D radomehttps://scholarbank.nus.edu.sg/handle/10635/69756Title: Coupled IE-PO method for analysis of antenna radiation patterns in the presence of a large 3D radome
Authors: Zhao, W.-J.; Gan, Y.-B.; Wang, C.-F.; Li, L.-W.
Abstract: A method based on integral equation (IE) coupled with physical optics (PO) method is proposed for the analysis of antennas in the presence of a large three-dimensional (3D) dielectric radome. The electric field integral equation (EFIE) is applied to the conducting surfaces of the antenna/array enclosed within a large 3D radome. Equivalent PO surface currents are assumed on the radome wails, induced by the near field radiation of the antenna. The PO currents are coupled back into the integral equation to account for the effects of the radome on the antenna. The resultant current distribution on the antenna obtained by this coupled IE-PO method is useful for computation of the antenna's input impedance and radiation patterns with the effect of radome. As PO method is applied to the large radome, no additional unknowns are needed, besides those defined on the surface of the entenna, leading to a substantial reduction in computational resources required. Numerical simulation showing the accuracy and efficiency of the coupled IE-PO method will be presented.
Thu, 01 Jan 2004 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/697562004-01-01T00:00:00Z
- Dielectric radome analysis using adaptive integral methodhttps://scholarbank.nus.edu.sg/handle/10635/69938Title: Dielectric radome analysis using adaptive integral method
Authors: Zhao, W.-J.; Li, L.-W.; Gan, Y.-B.
Abstract: An adaptive integral method (AIM) solution is described for the problem of electromagnetic transmission through radomes of arbitrary shape. The far field transmitted through a radome excited by a dipole array is studied. The computed results for spherical radome are in excellent agreement with the exact results. The application of AIM significantly reduces the memory and CPU time requirement for solving the integral equation. Hence, the algorithm presented in this paper can be applied to efficiently and accurately analyze dielectric radomes of sizes much larger than those that can be analyzed by a direct numerical method.
Wed, 01 Jan 2003 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/699382003-01-01T00:00:00Z
- Radiation pattern and input impedance of a radome-enclosed planar dipole array backed by a ground planehttps://scholarbank.nus.edu.sg/handle/10635/71538Title: Radiation pattern and input impedance of a radome-enclosed planar dipole array backed by a ground plane
Authors: Zhao, W.-J.; Gan, Y.-B.; Wang, C.-F.; Li, L.-W.
Abstract: Modeling of a planar dipole array backed by a ground plane within an electrically large radome is performed using the image theory and an efficient hybrid technique based on the integral equation method and high-frequency approximation. The current distributions on the surface of the radome-enclosed array are obtained, from which the radiation pattern and input impedance of the array can be determined. © 2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/715382005-01-01T00:00:00Z
- Analysis of aircraft-mounted antennas using modified current-based hybrid techniquehttps://scholarbank.nus.edu.sg/handle/10635/111539Title: Analysis of aircraft-mounted antennas using modified current-based hybrid technique
Authors: Zhao, W.-J.; Wang, C.-F.
Tue, 01 Jan 2008 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/1115392008-01-01T00:00:00Z