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The analysis of thick semi‐infinite coaxial line excited by a thin coaxial line‐fed probe
Author(s) -
Yung Edward K. N.,
Xie Z. M.,
Chen R. S.,
Han Y. F.
Publication year - 1998
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19980820)18:6<397::aid-mop10>3.0.co;2-x
Subject(s) - plunger , coaxial , transmission line , conductor , line (geometry) , coaxial cable , optics , physics , electrical impedance , electric power transmission , electrical engineering , engineering , mathematics , geometry , thermodynamics
The Green's functions for determining the electromagnetic fields in a semi‐infinite coaxial line due to a radially directed infinitesimally short electric dipole are derived. The coaxial line is shorted at one end and terminated at a perfectly match load at the other, and the probe is connected to the inner conductor of this semi‐infinite coaxial line, and is fed by a smaller coaxial line through a hole on the surface of the outer conductor. Based on this Green's functions, TEM, TE, and TM modes are considered in our analysis, and the input impedance of a small probe in front of the plunger is calculated. As a result, our theoretical results agree very well with the experimental data over a frequency band for several distances between the probe and the plunger. A comparison is also made between our results and those calculated by using traditional transmission line theory, which treats the probe as a transmission line branch. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 397–402, 1998.