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Penetration by a Laser-Light Induced Field and Coupling to a Monopole Attached on Axis to a Body of Revolution

Cengiz Ozzaim,

Prof. Cengiz Ozzaim

Eskisehir Technical University

Turkey

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Chalmers Butler

Dr. Chalmers Butler

Clemson University

USA

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Progress In Electromagnetics Research, Vol. 45, 217-241, 2004

doi:10.2528/PIER03072201

Abstract

In this paper is presenteda methodfor computing, andan experimental procedure for verifying, the coupling of a signal, caused by a modulatedlaser beam, to a loadimp edance terminating a coaxial waveguide whose center conductor protrudes into a an open-ended body of revolution (BOR). The excitation is the signal radiated by electrons emittedfrom the conducting surface by an impinging laser beam, modulated in such a way that the electrons escaping the surface oscillate harmonically in time causing them to radiate a coherent signal at an angular frequency Ï‰. For a vanishingly small spot of laser light on the conducting surface, the radiating source is modeled as an electric dipole normal to and located at the surface. To perform this computation directly is very difficult so we resort to an indirect methodthat allows us to realize significant savings with no loss in generality. The indirect approach adopted here takes the advantage of the reciprocity andallo ws one to determine the receivedsignal at the coax terminal load from knowledge of the field radiated by a small wire probe mounted on the symmetry axis of the BOR under the condition that the excitation results from a current generator impressedat the terminal endof the coax. This scheme necessitates the formulation andsolution of a simpler integral equation. In principle, the approach developed to solve this problem is exact and rigorous. The validity of this approach is demonstrated numerically and experimentally.

Citation

Cengiz Ozzaim Chalmers Butler , "Penetration by a Laser-Light Induced Field and Coupling to a Monopole Attached on Axis to a Body of Revolution," Progress In Electromagnetics Research, Vol. 45, 217-241, 2004.
doi:10.2528/PIER03072201
http://www.jpier.org/PIER/pier.php?paper=0307221

References

1. Dudley, D. G. and K. F. Casey, "A measure of coupling efficiency for antenna penetrations," IEEE Trans. Electromagnetic Comp., Vol. 33, No. 1, 1-9, 1991.
doi:10.1109/15.68244

2. Qiu, Z. and C. M. Butler, Analysis of a wire probe mounted on the nose of a missilelike body of revolution, URSI National Meeting, 1994.

3. Ozzaim, C. and C. M. Butler, Coupling to a probe in a metal can by an electric dipole, IEEE Antennas Propagat. Symp. Digest, 23-26, 1999.

4. Harrington, R. F., Time Harmonic Electromagnetic Fields, McGraw-Hill, New York, 1961.

5. Qiu, Z. and C. M. Butler, "Analysis of a wire in the presence of an open body of revolution," Progress in Electromagnetic Research, Vol. PIER 15, 3-26, 1997.

6. Harrington, R. F., Field Computation by Moment Methods, IEEE Press, Piscataway, NJ, 1993.

7. Butler, C. M. and L. L. Tsai, "An alternate frill fieldform ulation," IEEE Trans.A ntennas Propagat., Vol. 21, No. 1, 11-16, 1973.

8. Tsai, L. L., "A numerical solution for the near andfar fields of an annular ring of magnetic current," IEEE Trans.A ntennas Propagat., Vol. 20, No. 5, 569-576, 1972.
doi:10.1109/TAP.1972.1140283

9. Junker, G. P., A. W. Glisson, and A. A. Kishk, "Accurate impedance model for antiresonant monopoles on finite ground planes," Electronics Letters, Vol. 32, No. 18, 1632-1633, 1996.
doi:10.1049/el:19961146

10. Rothwell, E. J. and M. J. Cloud, "A Hallen-type integral equation for symmetric scattering from lossy circular disks," IEEE Trans. Antennas Propagat., Vol. 40, No. 8, 920-925, 1992.
doi:10.1109/8.163429

11. Martin, A. Q. and C. M. Butler, "Corroboration of the analysis of an axially directed antenna exciting a conducting tube," Journal of Electromagnetic Waves and Applications, Vol. 11, 821-858, 1997.