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Propagation and excitation of the higher‐order E x 11 mode in an insulated image guide
Author(s) -
Dolatsha Nemat,
Hesselbarth Jan
Publication year - 2012
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/mop.26450
Subject(s) - permittivity , microwave , optics , conductor , excitation , ground plane , materials science , classification of discontinuities , dipole , electric field , excited state , mode (computer interface) , propagation constant , waveguide , electrical engineering , physics , optoelectronics , dielectric , engineering , atomic physics , telecommunications , computer science , mathematics , mathematical analysis , quantum mechanics , antenna (radio) , composite material , operating system
The use of E x 11mode in an insulated image guide is proposed. This mode has much lower conductor loss than the fundamental, E y 11mode. The electric field of the mode is primarily parallel to the metal ground‐plane; therefore, the mode can be efficiently excited with a compact dipole structure oriented parallel to the ground‐plane. When the insulating layer is of low permittivity and relatively thick, the E x 11mode exhibits the highest effective permittivity (largest propagation constant) of all modes. This reduces unwanted mode coupling at discontinuities. Two example structures, a straight line and a double‐bended line are measured at frequencies around 8 GHz. The excitation of the waveguide causes insertion loss of less than 0.4 dB, and the radiation loss of the bends and the waveguide itself appears to be negligible. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:179–181, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26450