Analysis of Error Due to Exclusion of Higher Modes on Complex Permittivity Measurement Using Waveguide with Flange

Kouji SHIBATA
Osamu HASHIMOTO
Ramesh K. POKHAREL

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.1    pp.139-142
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.139
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
measurement of complex pemittivity,  rectangular waveguide with flange,  FDTD,  SDA,  

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Summary: 
In this letter, we discuss the measurement error due to the exclusion of the higher modes when a waveguide with a flange is inserted with lossy dielectric material. The reflection coefficient is calculated by a spectrum-domain approach (SDA), which uses only the dominant (TE10) mode to realize a simplified nondestructive measurement of complex permittivity of lossy dielectric sheets. The analysis shows that the error due to the exclusion of the higher modes decreases as complex permittivity increases. Consequently, we have confirmed that a simplified measurement of complex permittivity is possible by a coverage limitation with the SDA, which excludes the higher modes.