DSpace Collection:https://dyuthi.cusat.ac.in:443/jspui/handle/purl/9492024-02-07T10:07:08Z2024-02-07T10:07:08ZCompact dual-band antenna for wireless access pointGijo,AugustinShynu, S VMohanan, PAanandan,C KVasudevan, Khttps://dyuthi.cusat.ac.in:443/jspui/handle/purl/27412014-07-10T05:37:15Z2006-04-27T00:00:00ZTitle: Compact dual-band antenna for wireless access point
Authors: Gijo,Augustin; Shynu, S V; Mohanan, P; Aanandan,C K; Vasudevan, K
Abstract: A compact dual-band printed antenna covering the 2.4 GHz (2400-2485 MHz) and 5.2 GHz (5150-5350 MHz) WLAN bands is presented. The experimental analysis shows a 2:1 VSWR bandwidth of up to 32 and 8% for 2.4 and 5.2 GHz, respectively. The measured radiation patterns are nearly omnidirectional, with moderate gain in both the WLAN bands.2006-04-27T00:00:00ZTwo-dimensional Microwave Tomographic Imaging of Breast TissuesBindu, GSanthosh John, AbrahamAnil, LonappanVinu, ThomasAanandan,C KMathew, K Thttps://dyuthi.cusat.ac.in:443/jspui/handle/purl/27392014-07-09T05:24:40Z2006-01-01T00:00:00ZTitle: Two-dimensional Microwave Tomographic Imaging of Breast Tissues
Authors: Bindu, G; Santhosh John, Abraham; Anil, Lonappan; Vinu, Thomas; Aanandan,C K; Mathew, K T
Abstract: Despite its recognized value in detecting and characterizing breast disease, X-ray
mammography has important limitations that motivate the quest for alternatives to augment
the diagnostic tools that are currently available to the radiologist. The rationale for pursuing
electromagnetic methods are based on the significant dielectric contrast between normal
and cancerous breast tissues, when exposed to microwaves. The present study analyzes
two-dimensional microwave tomographic imaging on normal and malignant breast tissue
samples extracted by mastectomy, to assess the suitability of the technique for early
detection ofbreast cancer. The tissue samples are immersed in matching coupling medium
and are illuminated by 3 GHz signal. 2-D tomographic images ofthe breast tissue samples
are reconstructed from the collected scattered data using distorted Born iterative method.
Variations of dielectric permittivity in breast samples are distinguishable from the obtained
permittivity profiles, which is a clear indication of the presence of malignancy. Hence
microwave tomographic imaging is proposed as an alternate imaging modality for early
detection ofbreast cancer.2006-01-01T00:00:00ZDielectric Studies of Corn Syrup for Applications in Microwave Breast ImagingBindu, GAnil, LonappanVinu, ThomasAanandan,C KMathew, K Thttps://dyuthi.cusat.ac.in:443/jspui/handle/purl/27382014-07-09T05:22:57Z2006-01-01T00:00:00ZTitle: Dielectric Studies of Corn Syrup for Applications in Microwave Breast Imaging
Authors: Bindu, G; Anil, Lonappan; Vinu, Thomas; Aanandan,C K; Mathew, K T
Abstract: Permittivity and conductivity studies of corn syrup in
various concentrations are performed using coaxial cavity perturbation
technique over a frequency range of 250 MHz–3000 MHz. The results
are utilized to estimate relaxation time and dipole moments of the
samples. The stability of the material over the variations of time is
studied. The measured specific absorption rate of the material complies
with the microwave power absorption rate of biological tissues. This
suggests the feasibility of using corn syrup as a suitable, cost effective
coupling medium for microwave breast imaging. The material can also
be used as an efficient breast phantom in microwave breast imaging
studies.2006-01-01T00:00:00ZDielectric studies of polyvinyl-acetate-based phantom for applications in microwave medical imagingBindu, GAnil, LonappanVinu, ThomasAanandan,C KMathew, K Thttps://dyuthi.cusat.ac.in:443/jspui/handle/purl/27362014-07-09T05:23:17Z2006-11-01T00:00:00ZTitle: Dielectric studies of polyvinyl-acetate-based phantom for applications in microwave medical imaging
Authors: Bindu, G; Anil, Lonappan; Vinu, Thomas; Aanandan,C K; Mathew, K T
Abstract: Phantoms that exhibit complex dielectric
properties similar to low water content biological tissues
over the electromagnetic spectrum of 2–3 GHz
have been synthesized from carbon black powder,
graphite powder and polyvinyl-acetate-based adhesive.
The materials overcome various problems that are
inherent in conventional phantoms such as decomposition
and deterioration due to the invasion of bacteria
or mold. The absorption coefficients of the materials
for various compositions of carbon black and graphite
powder are studied. A combination of 50% polyvinylacetate-
based adhesive, 20% carbon black powder and
30% graphite powder exhibits high absorption coefficient,
which suggests another application of the material
as good microwave absorber for interior lining of
tomographic chamber in microwave imaging. Cavity
perturbation technique is adopted to study the dielectric
properties of the material.2006-11-01T00:00:00Z