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Author

S Natarajamani

Bio: S Natarajamani is an academic researcher from Amrita Vishwa Vidyapeetham. The author has contributed to research in topics: Microstrip antenna & Patch antenna. The author has an hindex of 6, co-authored 31 publications receiving 102 citations. Previous affiliations of S Natarajamani include National Institute of Technology, Rourkela.

Papers
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Journal ArticleDOI
TL;DR: A novel fractal based circularly polarized GPS antenna is designed to meet the bandwidth requirements of satellite receiver operating at a frequency of 1.575GHz using a truncated corner square patch technique.

14 citations

Proceedings ArticleDOI
26 Nov 2010
TL;DR: A simple and compact coplanar waveguide (CPW)-fed ultra wide band antenna is presented and the correlation between the mode-based field distribution and the UWB antenna achieves good impedance matching, consistent gain, and consistent group delay over an operating bandwidth.
Abstract: A simple and compact coplanar waveguide (CPW)-fed ultra wide band antenna is presented. The UWB antenna consists of a rectangular patch, which is etched onto an FR4 printed circuit board(PCB) with an overall size of 30mmX35mmX0.76mm. The simulation show that the UWB antenna achieves good impedance matching, consistent gain, and consistent group delay over an operating bandwidth. The correlation between the mode-based field distribution is discussed. Extended from the UWB antenna, four notch (5-6GHz) designs are also presented as a desirable feature for UWB application.

10 citations

Journal ArticleDOI
TL;DR: In this article, a planar microstrip-fed ultra wideband antenna for triple bands is presented and analyzed, which consists of semi-circular shaped radiating patch with two I-shaped stubs.
Abstract: A compact planar microstrip-fed ultra wideband antenna for triple bands is presented and analyzed. The proposed antenna consists of semi-circular shaped radiating patch with two I-shaped stubs. It provides a wide bandwidth of 3.05–11.7 GHz. A pair of spiral loop resonators merges with radiating patch to create the first notched band in 3.3–3.7 GHz for the WiMAX system. In addition, integrated microstrip resonators are coupled with ground to generate the second- and third-notched bands in 5.2–5.4 GHz for lower WLAN and 5.7–6 GHz for upper WLAN, respectively. Experimental results of the proposed antenna exhibit good radiation pattern, stable gain, and consistent group delay performances. The time domain behavior of the antenna with and without resonator is analyzed.

9 citations

Proceedings ArticleDOI
21 Mar 2012
TL;DR: In this article, a compact antipodal Vivaldi antenna for UWB allocation with band dispersion characteristics is presented, the main purpose of this design is the reduction of three parameters such as transient distortion, reflection co-efficient and surface wave loss.
Abstract: This paper presents a compact antipodal Vivaldi antenna for UWB allocation with band dispersion characteristics. The main purpose of this design is the reduction of three parameter such as transient distortion, reflection co-efficient & surface wave loss. The proposed antenna has the capability to operate over the bandwidth 3–11GHz at return loss < −10 dB, except the bandwidth of 5–6GHz for WLAN. By cutting Ω-shaped slot in the radiating patch frequency band notch created. The antenna is successfully designed and simulated, it showing broadband matched impedance, stable gain and radiation pattern over a operating bandwidth.

8 citations

01 Jan 2011
TL;DR: In this paper, a planar antenna with 3.5/5/8.2 GHz triple band-notched characteristics is presented. And the proposed antenna is optimized to operate in the frequency band from 3 to 11 GHz for VSWR < 2.
Abstract: This article presents the compact planar antenna with 3.5/5.5/8.2 GHz triple band-notched characteristics. The antenna consists of an octagon shape patch with 50 X transmission line. By etching two C-shaped slots in the patch and adding pair of L-shaped resonator coupled to the radiating patch, band-rejected filtering properties in the WiMAX/WLAN/ITU bands are achieved. The proposed ultrawide band (UWB) antenna is optimized to operate in the frequency band from 3 to 11 GHz for VSWR < 2. Measured results confirm that the antenna is suitable for UWB applications because of its compact size and high performance. V C 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:539-543, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26581

8 citations


Cited by
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Journal ArticleDOI
TL;DR: The results show that all the elements can cover the desired band of 3.3–3.6 GHz under the condition of −6-dB impendence bandwidth and the proposed eight-element MIMO array is a prospective candidate for future 5G smartphone applications.
Abstract: In this paper, an eight-element MIMO array for 5G smartphone applications in the 3.45-GHz band (3.3–3.6 GHz) is presented. The array consists of two types of four-antenna arrays (U-shaped and L-shaped coupled-fed loop elements), which are symmetrically distributed in the inner of the smartphone frame. The dimension of the system circuit board is $124\,\,\text {mm}\times 74$ mm and the size of two elements is $4.8\,\,\text {mm}\times 9.8$ mm ( $0.055\lambda \times 0.11\lambda $ , $\lambda $ represents the free-space wavelength at 3.45 GHz) and 4.9 $\text {mm}\times 12.5$ mm ( $0.056\lambda \times 0.14\lambda$ ), respectively. The proposed MIMO array is simulated, and a prototype is fabricated and tested. The results show that all the elements can cover the desired band of 3.3–3.6 GHz under the condition of −6-dB impendence bandwidth. The isolations are enhanced to 15 dB by combining the inverted-I ground slots with neutralization line (NL) structure. In addition, the envelope correlation coefficient (ECC) via any two elements is below 0.15 that shows good independence in far-field radiation characteristic. The measured efficiencies of the elements in the operating band are higher than 40%. Moreover, the array ergodic channel capacity is also calculated based on the correlation matrix method to be about 35 bps/Hz with a 20-dB signal-to-noise ratio. In addition, the effects of the user’s hand and the head has been analyzed as well. Based on the above, the proposed eight-element MIMO array is a prospective candidate for future 5G smartphone applications.

121 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive investigation of research carried out on dielectric resonator antennas (DRAs) in the last three and half decades, in an application-oriented approach, is presented.
Abstract: This survey article outlines a comprehensive investigation of research carried out on dielectric resonator antennas (DRAs) in the last three and half decades, in an application-oriented approach. DRAs have created a remarkable position in antenna engineering for their adept characteristics like high efficiency, low loss, wide bandwidth, compact size, 3-dimensional modeling flexibility, etc. The use of DRAs for different commercial and defense applications associated with the wireless communication is highlighted in this article. To make a smooth and effective survey article, all the application-oriented DRAs available in the open literature are classified in five different categories like microwave bands, specific frequency, technology, millimeter-wave, and miscellaneous types. The ultimate aims of this review article are as follows: (i) highlights the usability of DRAs for different commercial and defense applications, (ii) helpful for the antenna industries/manufacturers to find out the best DRA for any specific application as per their requirement, and (iii) points out research gap in some application domains which will be quite helpful for future antenna researchers. In the authors' opinion, this survey may be helpful to DRA researchers as such a survey process is not available in the open literature.

52 citations

Journal ArticleDOI
TL;DR: In this paper, a notched-band Vivaldi antenna with high-frequency selectivity is designed and investigated, and the antenna exhibits good impedance match, high radiation gain, and excellent radiation directivity in the passband.
Abstract: In this letter, a notched-band Vivaldi antenna with high-frequency selectivity is designed and investigated. To obtain two notched poles inside the stopband, an open-circuited half-wavelength resonator and a short-circuited stepped impedance resonator are properly introduced into the traditional Vivaldi antenna. By theoretically calculating the resonant frequencies of the two loaded resonators, the frequency locations of the two notched poles can be precisely determined, thus achieving a wideband antenna with a desired notched band. To validate the feasibility of this new approach, a notched band antenna with a fractional bandwidth of 145.8% is fabricated and tested. Results indicate that good frequency selectivity of the notched band from 4.9 to 6.6 GHz is realized, and the antenna exhibits good impedance match, high radiation gain, and excellent radiation directivity in the passband. Both the simulation and measurement results are provided with good agreement.

38 citations

Journal ArticleDOI
TL;DR: In this article, a modified compact planar ultrawideband (UWB) monopole antenna with triple controllable band-notched characteristics is presented, which consists of a modified stair cased V-shaped radiating element and partial ground plane.
Abstract: A modified compact planar ultrawideband (UWB) monopole antenna with triple controllable band-notched characteristics is presented in this paper. The proposed antenna consists of a modified stair cased V-shaped radiating element and partial ground plane. The triple band-notched characteristics are achieved by embedding two different vertical up C-shaped slots with a vertical down C-shaped slot in the radiating patch and in the ground plane, respectively. Besides, the bandwidth of each rejected band can be independently controlled by adjusting the dimensions of the corresponding band notched structure. The proposed antenna with rejected bands characteristics is successfully simulated, prototyped, and measured. The measured results show that the antenna operates until upper 11 GHz for voltage standing wave ratio (VSWR) is less than 2, and exhibits bands rejection of 1.6–2.66 GHz (49.76%), 3-4 GHz (28.57%), and 5.13–6.03 GHz (16.12%). Moreover, the proposed antenna shows a near omnidirectional radiation patterns, stable peak gain, and with small group delay and transfer function variation on the whole UWB frequency range except in the notched frequency bands, which makes it suitable for being used in the future UWB applications.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comprehensive, technical review of circularly polarized (CP) antennas for different applications in wireless communication, emphasizing on the recent developments in the concerned research.
Abstract: This literature presents a comprehensive, technical review of circularly polarized (CP) antennas for different applications in wireless communication, emphasizing on the recent developments in the concerned research. The article also presents a comparative study of various works reported in the open literature, with an aim to highlight the contribution of CP antenna systems in the chronological development of the wireless communication technology. The primary motive of this review is to (a) highlight the methodologies used by different researchers to portray and analyze the different aspects in which CP antennas find their applications in modern-day wireless communication, (b) provide a practical viewpoint of the future scope of the study, based upon the past and present state-of-art research trends and (c) provide a conceptual and technical support to present-day antenna designers to help the process of furtherance of innovation and multiple system integration. In conclusion, the article also throws some light upon the future scope of research in the vast domain of CP antenna applications.

28 citations