A simple method for measuring dielectric constant at microwave frequency (MIC CAD)

Singh, Raghvendra; De, Arijit; Yadava, R.S.

doi:10.1109/cpem.1990.110004

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…A number of methods [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] are available for measuring the dielectric constant of a slab/sheet/laminate substrate material at microwave frequencies. These may be classified as either nondestructive or destructive methods.…”

Section: Previous Workmentioning

confidence: 99%

“…1) The method may not be truly nondestructive as it requires fabrication of patch antenna on the test sample 2) Estimation of dielectric constant requires accurate measurement of patch geometry 3) The method requires substrate to be 3-4 times larger in size than patch having thickness much less than 1/β 4) Computation complexity is higher. Singh, De and Yadava [15] have presented a nondestructive method of measuring dielectric constant of a slab material with accuracy of 1.6% and 1.9% for high permittivity (ε r =10.2) substrates and 4.5% for low permittivity (ε r =2.22) substrates. The method has following limitations.…”

Section: Previous Workmentioning

confidence: 99%

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Nondestructive method for measuring dielectric constant of sheet materials

Mathur¹,

Bhatnagar²,

Sahula³

2011

TENCON 2011 - 2011 IEEE Region 10 Conference

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In many applications including RF, Microwave dielectric constant (ε r ) of the material is a key design parameter. Present methods for measurement of ε r are time-consuming and require a sample piece of the material on which some processing has to be done (destructive methods). This paper presents a nondestructive and simple method for determining ε r of sheet dielectric materials. The method is nondestructive in the sense that cutting of the material or any processing on it is not required. In this method resonant frequency ( f r ) of a pre-fabricated antenna is first measured with a known material and then again measured with the Material Under Test (MUT) as dielectric part of the microstrip antenna. The parameter ε r is then determined from the ratio of these resonant frequencies and the thickness of MUT. The experimentation is arranged so that errors due to measurement in patch dimensions and electrical connections to the feed line are eliminated. The method can be used for on-line quality control during production of dielectric sheets. An aperture coupled microstrip antenna has been designed and fabricated with f r = 8.4 GHz. A simple jig has been constructed to hold the antenna and connecting cable. It provides an easy means for changing the MUT and brings different areas under the patch. Measurements validate the design and simulation results.

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