Bharati Singh | S.K Somaiya College of Arts,Sc. &Comm. (original) (raw)

Papers by Bharati Singh

IOSR Journal of Electronics and Communication Engineering, 2014

International Journal of Engineering Research and, 2017

2017 IEEE Applied Electromagnetics Conference (AEMC), 2017

The width of the Rectangular Microstrip Antenna (RMSA) is varied to change its gain and hence the... more The width of the Rectangular Microstrip Antenna (RMSA) is varied to change its gain and hence the aperture distribution of the series fed array in the E plane. In series fed antenna arrays, the aperture distribution (amplitude tapering) is realized by keeping the width of the central RMSA maximum and reducing the width of other elements as per the desired tapering. To realize uniform aperture distribution for centrally fed linear array, width of the RMSA has been varied in the reverse manner in comparison to the conventional tapering method to effectively realize uniform linear tapered array. An analysis with respect to number of elements and sharpness of tapering is presented and reduction of First Side Lobe Level (FSLL) is obtained. Simulated and experimental results are in good agreement.

It is essential to simplify the feed network in tapered antenna arrays to reduce its cost and com... more It is essential to simplify the feed network in tapered antenna arrays to reduce its cost and complexity. Aperiodic arrays represent an interesting solution for sharp beam forming, simplification of feed network, and improvement of first side lobe level (FSLL). In this paper, a complete analysis based on variation of distances between elements based on standard aperture distribution coefficients for side lobe reduction is proposed. The procedure relies on varying the locations of the array elements to realize tapering for reduction in interference of wireless communication systems.

Series fed arrays with feed at the centre element have been used as a natural tapered array for f... more Series fed arrays with feed at the centre element have been used as a natural tapered array for first sidelobe level (FSLL) reduction. The fact that all elements of the series fed arrays do not receive equal power has been used to realize natural tapering in these arrays. An analysis with respect to number of elements and size of the elements for the series fed arrays used is clearly brought about.

Microwave and Optical Technology Letters, 2018

For the fundamental TM10 mode of an equilateral triangular microstrip antenna (ETMSA), along its ... more For the fundamental TM10 mode of an equilateral triangular microstrip antenna (ETMSA), along its height, the impedance value is maximum at the vertex, zero at the isocenter and finite value at the base. Along the base, the impedance remains constant in between 150 to 200 Ω, depending upon the design. Thus, 50‐Ω microstrip (MS) line cannot be used to directly feed an ETMSA at its base. Instead, either inset or impedance transformer is used to facilitate the 50‐Ω MS line feed. In this article, a simple MS line feed at the base is proposed using a single shorting post for impedance matching. By inserting a shorting post (via) closer to the edge of the base of an ETMSA, a wide range of impedances can be achieved at any of the edge by selecting proper shorting positions. A detailed investigation of an ETMSA with variation in shorting post position is carried out for the direct MS line feed. Experiments have been carried out to validate the concept.

Microwave and Optical Technology Letters, 2017

This article presents a design of a series fed compact antenna array based on the concept of gain... more This article presents a design of a series fed compact antenna array based on the concept of gain variation of a rectangular microstrip antenna for a desired aperture/amplitude distribution to suppress the first side lobe level (FSLL). An analysis is presented in the X band with respect to the number of elements for series fed antenna arrays. The requirement of a compact design having few numbers of elements with reduced FSLL and beam tilt of 50 degrees has been realized. Simulated results are experimentally validated with reasonable agreement.

International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2013

Patch antenna suffers from surface wave radiation and mutual coupling reduces antenna gain. To ov... more Patch antenna suffers from surface wave radiation and mutual coupling reduces antenna gain. To overcome this, EBG structures are used. Mostly used EBG structures are 2D type. Here proposing a uniplanar EBG showing the effect on mutual coupling and gain of antenna arrays. Changing the gap is studied to find the effect on bandwidth of operation.

Progress In Electromagnetics Research M, 2018

IETE Journal of Research

ABSTRACT A design technique of an antenna array with amplitude distribution/tapering to suppress ... more ABSTRACT A design technique of an antenna array with amplitude distribution/tapering to suppress the first side lobe level by exploiting the property of the rectangular microstrip antenna (RMSA) is proposed. Non-identical antenna array elements have been designed using the RMSAs by varying their width and hence the gain (keeping the length and hence the frequency same) to obtain the amplitude distribution for a desired first side lobe level. This eliminates the need of a complicated feed network with unequal power division to realize amplitude tapering. The conceptualized design is verified for a number of corporate-fed arrays and an analysis is carried out to give design guidelines with respect to the number of elements in the array. A symmetric corporate-fed 8-element antenna array with a cosine-square over pedestal amplitude distribution, operating at 1.8 GHz, has been designed and fabricated to validate the proposed concept. There is a reasonable agreement between simulated and measured results.

IETE Technical Review, 2016

ABSTRACT The main feature of an antenna array is its ability to form and scan the shaped main bea... more ABSTRACT The main feature of an antenna array is its ability to form and scan the shaped main beam by using the amplitude and phase inputs as the controlling parameters at element level. In this paper, a comprehensive analysis of various parameters of a uniformly spaced linear array with respect to a number of elements for different amplitude distribution/window functions has been presented. There is a general assumption that any given window function will realize the expected parameters of the array even for a small number of array elements. A systematic study has been done to bring out very clearly the minimum number of elements that is required to realize antenna performance for a particular amplitude distribution. Effect of number of elements to obtain the desired first side lobe level and efficiency is presented. Contributions have been made to discuss the effects on directivity, gain, and beamwidth of the linear array.