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The input impedance of a coaxial line fed probe in a cylindrical waveguide

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2 Author(s)
Lee, W.W.S. ; Dept. of Electr. Eng., Hong Kong Polytech., Hong Kong ; Yung, E.K.N.

Dyadic Green's functions for determining the electric and magnetic fields in a cylindrical waveguide due to a radially directed infinitesimally short electric dipole are derived. The waveguide is shorted at one end and terminated at a perfectly matched load at the other. Both TE and TM modes are considered. Based on these dyadic Green's functions, the input impedance of a coaxial line fed probe in front of the plunger is derived. The formula is expressed in a closed form. Excellent agreement between theoretical results and experimental data for exciting the TE11 mode in the X band for various probe positions is observed

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:42 ,  Issue: 8 )