A tapered-permittivity rod antenna for ground penetrating radar applications

A new dielectric rod antenna design modified from its previous version developed by Chen [IEEE Trans. Geosci. Remote Sens. (accepted for publication)] is presented. Such an antenna is useful in detecting small and shallow subsurface objects with excellent depth and spatial resolutions. These features make it useful in detecting small anti-personnel (AP) mines, pavement cracks and the surface layer. Broad bandwidth electromagnetic energy is fed into the rod from one end, guided along the rod and then radiated from the other end where the rod diameter is linearly tapered to a point. The tapered-permittivity design uses an additional permittivity taper to overcome the problem of a frequency-dependent pattern when high dielectric material is used for size reduction. This new design reduces the internal reflections at the tapered section and results in better efficiency and less antenna clutter.

[1]  K. Yee.  Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media , 1966 .

[2]  G. E. Mueller,et al.  Polyrod antennas , 1947 .

[3]  Chi-Chih Chen,et al.  A standoff, focused-beam land mine radar , 2000, IEEE Trans. Geosci. Remote. Sens..

[4]  Carlton H. Walter,et al.  Traveling Wave Antennas , 1970, Antenna and EM Modeling with MATLAB® Antenna Toolbox.

[5]  C. W. Horton,et al.  The Radiation Patterns of Dielectric Rods—Experiment and Theory , 1948 .

[6]  Peter K. Hayes.  Electromagnetic behavior of transmission lines and resonant wires very near a lossy dielectric interface , 1983 .

[7]  S.,et al.  Numerical Solution of Initial Boundary Value Problems Involving Maxwell’s Equations in Isotropic Media , 1966 .

[8]  Joel T. Johnson,et al.  Theoretical study of a surface clutter reduction algorithm , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[9]  R. Collin.  The Optimum Tapered Transmission Line Matching Section , 1956, Proceedings of the IRE.

[10]  Andreas C. Cangellaris,et al.  GT-PML: generalized theory of perfectly matched layers and its application to the reflectionless truncation of finite-difference time-domain grids , 1996, IMS 1996.

[11]  Andreas C. Cangellaris,et al.  GT-PML: generalized theory of perfectly matched layers and its application to the reflectionless truncation of finite-difference time-domain grids , 1996, 1996 IEEE MTT-S International Microwave Symposium Digest.