Now showing items 21-25 of 25
Abstract: | In this paper we have investigated the effect of cavity diameter and wall height on resonance and radiation characteristics of a circular microstrip patch antenna. Experiments were conducted using a fabricated prototype placed inside a cylindrical cavity. The results were compared and verified with simulated data obtained using an electromagnetic simulator. About 9.6 to 10.5 dBi peak gain was obtained from measured and simulated data |
URI: | http://dyuthi.cusat.ac.in/purl/1088 |
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APSYM-08 (G).zip | (27.35Mb) |
Abstract: | A simple and efficient method for determining the complex permittivity of dielectric materials from both reflected and transmitted signals is presented. It is also novel because the technique is implemented using two pyramidal horns without any focusing mechanisms. The dielectric constant of a noninteractive and distributive (NID) mixture of dielectrics is also determined |
URI: | http://dyuthi.cusat.ac.in/purl/1374 |
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Dyuthi-P00418.pdf | (452.6Kb) |
Abstract: | The radiation characteristics of a new type of hollow dielectric H-plane sectoral horn antenna are presented. Metallic strips of optimum length are loaded on the H-walls of the sectoral horns. The effects of strip loading for producing square patterns in the H plane are discussed. |
URI: | http://dyuthi.cusat.ac.in/purl/2977 |
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Dyuthi-P00412.pdf | (115.5Kb) |
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. |
URI: | http://dyuthi.cusat.ac.in/purl/2739 |
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Dyuthi-P00373.pdf | (1.186Mb) |
Abstract: | A trapezoidal strip grating surface that eliminates specular reflections almost over the entire X -band frequency range for TM polarization is reported This new grating structure overcomes the bandwidth limitation of conventional rectangular strip grating surfaces |
URI: | http://dyuthi.cusat.ac.in/purl/1348 |
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Wideband trapez ... of specular reflection.PDF | (808.9Kb) |
Now showing items 21-25 of 25
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