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34 results on '"Narayan, Shiv"'

15. Novel Metamaterial-Element-Based FSS for Airborne Radome Applications.

Author

Narayan, Shiv, Gulati, Gitansh, Sangeetha, B., and Nair, Raveendranath U.

Subjects
*METAMATERIALS, *RADOMES, *RADAR antennas, *MAGNETIC resonance, *MAGNETIC materials
Abstract

A novel metamaterial (MTM) element for radome applications is presented in this paper, which shows negative permittivity and permeability characteristics at distinct frequency ranges. The MTM element is composed of tightly coupled Swastika-shaped conductors printed on both sides of the dielectric substrate. The electromagnetic (EM) analysis of the proposed structure is carried out using the full-wave method-based standard software package and then validated with the experimental results. The MTM structure is further modified by introducing shorting strips at its edges to improve bandpass FSS response with flat-top and sharp roll-off characteristics in microwave and millimeter-wave frequency regimes. In view of airborne radome application of MTM-FSS structure, a multilayered hemispherical radome is designed by embedding it in the mid-plane of the radome wall. The EM performance of the antenna–radome system is analyzed using 3-D ray tracing geometrical optics in conjunction with aperture integration method, incorporating the transmission characteristics of MTM-FSS-based radome wall using CST Microwave Studio. The MTM-FSS-based radome exhibits superior EM performance characteristics as compared to the conventional optimized monolithic radome over the frequency range of 8.5–10.3 GHz, with high transmission efficiency (~0.30) and minimal boresight error (~4 mrad) for the entire beam steering range. [ABSTRACT FROM AUTHOR]

Published
2018
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29. Electromagnetic Techniques and Design Strategies for FSS Structure Applications [Antenna Applications Corner].

Author

Narayan, Shiv and Jha, Rakesh Mohan

Subjects
WIRELESS communications, RADAR antennas, METAMATERIALS, BIOSENSORS, ELECTROMAGNETISM
Abstract

Frequency-selective surfaces (FSSs) have a wide spectrum of applications in airborne platforms, wireless communication systems, medical imaging instruments, and high-power microwave systems. To employ finite, electrically large, and conformal FSSs for such applications, the development of an efficient electromagnetic (EM) design and analysis technique is essential, which is a challenging task in terms of computational complexity and requirements of highend computing platforms. In view of assessing the efficacies of various EM techniques for the design and analysis of FSS structures employed for planar and conformal surfaces, a brief review is presented here. Furthermore, the design strategies of novel FSS structures including metamaterial (MTM)-element FSSs are discussed for specific applications such as highperformance radomes, radar absorbing structures (RASs), and antennas. The complex issues associated with the EM design and analysis of FSS structures are also outlined for radomes, RAS, and antennas. [ABSTRACT FROM AUTHOR]

Published
2015
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34. RF leakage radiation from microwave oven for aircraft interior applications.

Author

Narayan, Shiv, Arun K., Jha, R. M., and Bommer, Jason P.

Abstract

The EM analysis of RF leakage radiation from microwave oven has been carried out using FDTD method in this paper. Here the microwave oven structure is modeled as rectangular cavity. The leakage through the gap between the door and the oven cavity, which is the most probable path of leakage of radiation, is determined using FDTD method. Further, the far-field radiation pattern of microwave oven is computed by the far-field transformation of Huygen's equivalent sources using Green's function. It is found that the RF leakage from microwave oven has a characteristic interference far-field pattern. [ABSTRACT FROM PUBLISHER]

Published
2012
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