| 1. |
- Barocchi, M A, et al.
(författare)
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A pneumococcal pilus influences virulence and host inflammatory responses
- 2006
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Ingår i: Proceedings of the National Academy of Sciences. - : Proceedings of the National Academy of Sciences. - 1091-6490 .- 0027-8424. ; 103:8, s. 2857-2862
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Tidskriftsartikel (refereegranskat)abstract
- Streptococcus pneumoniae (pneumococcus) is a major cause of morbidity and mortality world-wide. The initial event in invasive pneumococcal disease is the attachment of encapsulated pneumococci to epithelial cells in the upper respiratory tract. This work provides evidence that initial bacterial adhesion and subsequent ability to cause invasive disease is enhanced by pili, long organelles able to extend beyond the polysaccharide capsule, previously unknown to exist in pneumococci. These adhesive pili-like appendages are encoded by the pneumococcal rlrA islet, present in some, but not all, clinical isolates. Introduction of the rlrA islet into an encapsulated rlrA-negative isolate allowed pilus expression, enhanced adherence to lung epithelial cells, and provided a competitive advantage upon mixed intranasal challenge of mice. Furthermore, a pilus-expressing rlrA islet-positive clinical isolate was more virulent than a nonpiliated deletion mutant, and it out-competed the mutant in murine models of colonization, pneumonia, and bacteremia. Additionally, piliated pneumococci evoked a higher TNF response during systemic infection, compared with nonpiliated derivatives, suggesting that pneumococcal pili not only contribute to adherence and virulence but also stimulate the host inflammatory response.
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| 2. |
- Kanth, R. K., et al.
(författare)
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Analysis, design and development of novel, low profile microstrip antenna for satellite navigation
- 2009
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Ingår i: Proc. NORCHIP. ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- International Telecommunication Union Radio Communication Sector ( ITU-R) has assigned 1.176 GHz and 2.487 GHz respectively in L and S band to Regional Navigational Satellite System (RNSS) for satellite navigation purpose. In this paper attempt has been made to design a novel, low profile compact microstrip antenna which achieves required specification such as gain of -4 dBi up to ±50° and bandwidth of 30 MHz. The design of L band antenna was carried out using Ansoft Designer Version 2 software and was fabricated and measured the required performance of antenna in terms of its return loss, VSWR and gain radiation pattern. The return loss of the developed antenna was measured with the vector network analyzer and its gain radiation pattern in anechoic chamber and the performance of its measurements were compared with the analyzed results.
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| 3. |
- Kanth, R. K., et al.
(författare)
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Design of multiband fractal antenna for mobile and handheld terminals
- 2009
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Ingår i: 1st South Central Asian Himalayas Regional IEEE/IFIP International Conference on Internet, AH-ICI 2009. - 9781424445707 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- The main objective of this paper is to give detailed analysis of a Dual Band fractal antenna operating simultaneously at L and S Band. A L/S band Sierpinski fractal stacked multilayer patch antenna has been designed, and analyzed for achieving -4 dBi gain at ±50 degree using Ansoft Designer Tool. To evaluate the performance of this dual band antenna in comparison to two separate antennas, efforts are also made to design two separate triangular patch antennas resonating at individual L and S band frequencies. The analyzed performance of the antenna indicates two distinct frequency bands, meeting the VSWR requirement and its gain radiation pattern. The designed topology of the dual band fractal antenna can be employed for satellite navigation.
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| 4. |
- Amin, Yasar, et al.
(författare)
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Printable RFID antenna with embedded sensor and calibration functions
- 2013
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Ingår i: Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, Aug. 12-15, 2013. - : Electromagnetics Academy. - 9781934142264 ; , s. 567-570
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Konferensbidrag (refereegranskat)abstract
- An RFID antenna with integrated humidity sensor and calibration functionality for wireless sensor network is proposed. The antenna is composed of series and shunt stubs for impedance matching and reliability for near-field communication. The innovative ladder contour structure plays the key role for humidity sensing, and sensor calibration. The quadrangular end-tip loading is employed to offer capacitance and stability for far-field communication. The prototypes of the antenna are fabricated and tested: antenna effectively senses the ambient humidity levels while demonstrating stable behavior for RFID communication. The antenna has a compact size of 1 × 10cm for 902-928 MHz RFID band.
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| 5. |
- Kanth, R. K., et al.
(författare)
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Analysis, design and development of novel, low profile 2.487 GHz microstrip antenna
- 2010
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Ingår i: 2010 14th International Symposium on Antenna Technology and Applied Electromagnetics and the American Electromagnetics Conference, ANTEM/AMEREM 2010. - 9781424450503 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- International Telecommunication Union Radio Communication Sector ( ITU-R) has assigned 1.176 GHz and 2.487 GHz respectively in L and S band to Regional Navigational Satellite System (RNSS) for satellite navigation purpose. In this paper attempt has been made to design a novel, low profile compact microstrip antenna which achieves required specification such as gain of -4dBi up to ±50° and bandwidth of 30 MHz. The design of S band antenna was carried out using Ansoft Designer software, was fabricated and the required performance of antenna was measured in terms of its return loss, VSWR and gain radiation pattern. The return loss of the developed antenna was measured with the vector network analyzer and its gain radiation pattern in anechoic chamber and the performance of its measurements were compared with the analyzed results.
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| 6. |
- Kanth, R. K., et al.
(författare)
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Autonomous use of fractal structure in low cost, multiband and compact navigational antenna
- 2010
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Ingår i: Proc. Mediterranean Microwave Symp. (MMS). ; , s. 135-138
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Konferensbidrag (refereegranskat)abstract
- Different fractal structures and their relevance in navigational antennas have been studied. Based on multiband characteristics and performance of sierpinski gasket fractal structures, a dual band, low profile antenna is devised in this paper. Classical fractal structures have been generated with extensive use of MATL AB, dimensions of the parasitic layers are determined viaseveral optimizations in Math CAD and finally design analysis is carried out using Ansoft Designer. The performance of this antenna is theoretically measured in terms of its return loss, gain radiation pattern and axial ratio. The multi layered physical antenna has been fabricated using glass epoxy substrate material contributing acceptable bandwidth in bothbands. The measured performance of the fabricated antenna has been analyzed and evaluated with the theoretical outcomes.
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| 7. |
- Kanth, R. K., et al.
(författare)
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Comparative End-of-Life Study of Polymer and Paper Based Radio Frequency Devices
- 2012
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Ingår i: International Journal of Environmental Protection. - 2224-7777. ; 2, s. 23-27
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Tidskriftsartikel (refereegranskat)abstract
- In this work end-of-life (EOL) analysis of polymer and paper based radio frequency devices have been carried out. Polymer and paper based RFID antenna has been chosen as a radio frequency device. An attempt has been made to investigate and evaluate the environmental emissions at end-of-life-cycle stage and to explore type and quantity of emissions at their disposal. The Gabi’s balance calculation methodology has been employed to determine amount of environmental emissions at the end-of-life cycle stage. Each significant component of the antenna and their corresponding emissions has been investigated in this paper. We have also compared the corresponding emissions to air and fresh water in both the technologies i.e. incineration and land-filling at EOL stage.
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| 8. |
- Kanth, R. K., et al.
(författare)
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Comparative toxic emission analysis in production process of polymer and paper Based RFID tags
- 2012
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Ingår i: 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012 - Conference Proceedings. - : IEEE. ; , s. 184-187
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Konferensbidrag (refereegranskat)abstract
- A balance optimization method has been employed to determine the quantity of toxic emissions particularly in emissions to air, fresh water, sea water and industrial soil, in production process of polymer and paper based RFID tags. We have developed a low profile antenna design for passive UHF RFID tags using both polymer and paper substrate with copper and aluminum for the antenna trace. Comparative analysis of toxic emissions during production process of polymer and paper based RFID antennas have been discussed in this paper. Our results show that paper based RFID antennas yield lower organic emissions to the environment while considerably higher inorganic emissions to the air. The results also depict that air is highly affected with the toxic emissions compared to fresh water, sea water and industrial soil.
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| 9. |
- Kanth, R. K., et al.
(författare)
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Design of sierpinski grid patch antenna for multiband application
- 2013
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Ingår i: Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, Aug. 12-15, 2013. - 9781934142264 ; , s. 577-582
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Konferensbidrag (refereegranskat)abstract
- The purpose of this paper is two-fold. Firstly, we have attempted to design a planar Sierpinski fractal antenna with stacked configuration for multiband applications. The stacked configuration of Sierpinski fractal patch and Sierpinski grid are employed to improve the multiband characteristics. The operating frequencies obtained are at 3.3 GHz, 5GHz, 5.74 GHz and 5.9 GHz which covers the bands useful for HIPERLAN2 frequencies and for implementation in futuristic WiFi enabled devices and PCI Cards for mobile internet. The Simulated results show that the operating frequencies obtained are spread over a wide range of frequency band compared to the simple Sierpinski fractal patch antenna. Secondly this paper aims at evaluating the sustainability and life cycle management of proposed antenna.
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| 10. |
- Kanth, R. K., et al.
(författare)
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Design of Sierpinski Grid Patch Antenna for Multiband Application and Sustainability Analysis in its Manufacturing Process
- 2012
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Ingår i: IEEE International Conference on Industrial Technology. ; , s. 1-5
-
Konferensbidrag (refereegranskat)abstract
- The purpose of this paper is two-fold. Firstly, we have attempted to design a planar Sierpinski fractal antenna in stacked configuration for multiband application. The stacked configuration of Sierpinski fractal patch and Sierpinski grid are employed to improve the multiband characteristics. The operating frequencies obtained are at 3.3 GHz, 5 GHz, 5.74 GHz and 5.9 GHz which covers the bands useful for HIPERLAN2 frequencies and for implementation in futuristic WiFi enabled devices and PCI Cards for mobile internet. The Simulated results show that the operating frequencies obtained are spread over a wide range of frequency band compared to the simple Sierpinski fractal patch antenna. Secondly this paper aims at evaluating the sustainability and life cycle management of proposed antenna.
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