Cavity Perturbation Techniques for Measuring Dielectric Parameters of Water and Other Allied Liquids

Mathew, K. T.; Raveendranath, U

doi:10.1002/1616-8984(200001)7:1<185::aid-seup185>3.0.co;2-u

Cited by 30 publications

(20 citation statements)

References 26 publications

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“…Dielectric parameters of the material in the frequency range of 2000-4000 MHz are done using cavity perturbation technique [12,13]. The results are compared with that of the breast tissue data [6] and good agreement is observed [12].…”

Section: Coupling Mediumsupporting

confidence: 40%

Active Microwave Imaging for Breast Cancer Detection

Bindu¹,

Abraham²,

Lonappan³

et al. 2006

PIER

105

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Abstract-Active microwave imaging is explored as an imaging modality for early detection of breast cancer. When exposed to microwaves, breast tumor exhibits electrical properties that are significantly different from that of healthy breast tissues. The two approaches of active microwave imaging -confocal microwave technique with measured reflected signals and microwave tomographic imaging with measured scattered signals are addressed here. Normal and malignant breast tissue samples of same person are subjected to study within 30 minutes of mastectomy. Corn syrup is used as coupling medium, as its dielectric parameters show good match with that of the normal breast tissue samples. As bandwidth of the transmitter is an important aspect in the time domain confocal microwave imaging approach, wideband bowtie antenna having 2:1 VSWR bandwidth of 46% is designed for the transmission and reception of microwave signals. Same antenna is used for microwave tomographic imaging too at the frequency of 3000 MHz. Experimentally obtained time domain results are substantiated by finite difference time domain (FDTD) analysis. 2-D tomographic images are reconstructed with the collected scattered data using distorted Born iterative method. Variations of dielectric permittivity in breast samples are distinguishable from the obtained permittivity profiles.

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Section: Coupling Mediumsupporting

confidence: 40%

Active Microwave Imaging for Breast Cancer Detection

Bindu¹,

Abraham²,

Lonappan³

et al. 2006

PIER

105

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“…Cavity perturbation technique [4] is employed for the study. Closed section of a waveguide constitutes a waveguide cavity resonator.…”

Section: Principlementioning

confidence: 44%

Dielectric properties of ionomers at microwave frequencies

et al. 2002

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Ionic polymers (ionomers) with interesting characteristics are emerging as important commercial polymers. Ionomers have the unique ability to behave as cross-linked materials at ambient temperatures and to melt and flow at elevated temperatures like thermoplastics. The complex permittivity and conductivity of a class of ionomers at microwave frequencies are determined using the cavity perturbation technique and the results are presented. D

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“…According to the theory of cavity perturbation, the complex frequency shift is related as [11][12][13] …”

Section: Theory Of Cavity Perturbationmentioning

confidence: 47%