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Author

Devashree S. Marotkar

Bio: Devashree S. Marotkar is an academic researcher from Rajiv Gandhi College of Engineering. The author has contributed to research in topics: Microstrip antenna & Antenna measurement. The author has an hindex of 3, co-authored 3 publications receiving 51 citations.

Papers
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Proceedings ArticleDOI
03 Mar 2016
TL;DR: Bandwidth enhancement of Rectangular microstrip patch antenna (RMPA) using defected ground structure (DGS), which is suitable for different applications of WLAN.
Abstract: This paper presents a Bandwidth enhancement of Rectangular microstrip patch antenna (RMPA) using defected ground structure (DGS). A simple RMPA is designed which works at 2.4 GHz frequency. This antenna is considered as reference antenna. This antenna has bandwidth of 67 MHz. In this RMPA DGS technique is integrated. U shape DGS is inserted in a simple RMPA. Due to DGS, Bandwidth is improved compared to earlier antenna. Later this U shape DGS is modified to E shape DGS. Later this E shape DGS is modified to Double E shape DGS and finally into Psi shape DGS. The bandwidth of simple RMPA was 67 MHz which got improved to 302 MHz at 2.4 GHz frequency of with Psi shape DGS. The bandwidth received is suitable for different applications of WLAN. Ansoft HFSS software is used for simulation of the designed structure.

37 citations

Proceedings ArticleDOI
26 Feb 2015
TL;DR: The proposed micro strip-feed antenna consists of glass shaped with defected ground structure for cognitive radio application and uses FR-4 substrate having thickness of 1.6mm and dielectric constant of 4.4.
Abstract: The proposed micro strip-feed antenna consists of glass shaped with defected ground structure for cognitive radio application. The proposed antenna uses FR-4 substrate having thickness of 1.6mm and dielectric constant of 4.4. By using two switches a combination of wideband and narrowband antennas into the same substrate is designed. The antenna can be used as a wideband antenna when both switches are in on position. Micro strip-fed planer glass-shaped monopole operates from 2.6 GHz to 12.6 GHz which is used as a sensing antenna. The narrowband antenna designed to operate from 9.4- 12.08GHz (s1 on, s2 off), 6.68-9.4GHz, 10.76-12.37GHz (s1 off, s2 on), 9.62-12.62GHz, 4.09-4.2GHz (s1 off, s2 off). The proposed antenna was designed by using software HFSS 13.0 (Higher frequency simulation software).

16 citations

Proceedings ArticleDOI
01 Dec 2015
TL;DR: In this article, an asymmetric Sai shape defected ground structure (DGS) is inserted in a ground plane of a conventional Rectangular Microstrip patch antenna (RMSA) for 2.4 GHz frequency.
Abstract: This paper presents a Bandwidth enhancement of microstrip patch antenna using defected ground structure (DGS). In this paper asymmetric Sai shape defected ground structure (DGS) is inserted in a ground plane of a conventional Rectangular Microstrip patch antenna (RMSA). The antenna is designed for 2.4 GHz frequency. The antenna is simulated by the software HFSS. HFSS is employed to analyze the proposed antenna and simulated results. The Results of simulated antenna and fabricated antenna are compared .The Major focus of this paper is to improve the band width so that patch antenna is used for wide band applications.

6 citations


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Journal Article
01 Jan 2010-Scopus
TL;DR: In this article, two designs of an ultra-wideband antenna with reconfigurable band notches are presented, one based on several nested complementary split-ring resonators and the other based on two identical split ring resonators.
Abstract: In this paper, two designs of an ultra-wideband antenna with reconfigurable band notches are presented. The first design is based on several nested complementary split-ring resonators, whereas the second has two identical split-ring resonators. Electronic switches mounted across or along these resonators serve to activate or deactivate their corresponding band notches, thus leading to band-notch reconfigurability. Prototypes of the two designs are fabricated and tested, and their results are compared.

34 citations

Proceedings ArticleDOI
01 Sep 2018
TL;DR: In this paper, a 2.45 GHz rectangular inset-fed microstrip patch antenna with defected ground structures for ISM band applications has been presented, which achieves good directivity gain of 7.04 dBi and VSWR of 1.06 at the resonant frequency that makes it suitable for WLAN applications.
Abstract: An operating center frequency of 2.45 GHz rectangular inset fed microstrip patch antenna with defected ground structures for ISM band applications has been presented in this paper. The return loss of the proposed antenna is -29.726 dB with impedance bandwidth for $S_{11}< _{-}10\mathrm {d}\mathrm {B}$ is 2.441 to 2.462 GHz, that covers IEEE S02.11 g/n OFDM 20 MHz channel width. The antenna has a directional far-field pattern at the boresight direction of $0^{o}$ with a good total antenna efficiency of -1.39 dB. The proposed antenna is light weighted, easy to fabricate and achieved good directivity gain of 7.04 dBi and VSWR of 1.06 at the resonant frequency that makes it suitable for WLAN applications.

29 citations

Journal ArticleDOI
TL;DR: The proposed defected ground structure-based microstrip patch antenna has been proposed that can work for narrowband applications and is light weighted, low cost, easy to fabricate and with better performances that makes it suitable for biomedical WLAN applications.
Abstract: Proper narrowband antenna design for wearable devices in the biomedical application is a significant field of research interest. In this work, defected ground structure-based microstrip patch antenna has been proposed that can work for narrowband applications. The proposed antenna works exactly for a single channel of ISM band. The resonant frequency of the antenna is 2.45 GHz with a return loss of around -30 dB. The -10dB impedance bandwidth of the antenna is 20 MHz (2.442-2.462 GHz), which is the bandwidth of channel 9 in ISM band. The antenna has achieved a high gain of 7.04 dBi with an increase of 17.63% antenna efficiency in terms of realized gain by using defected ground structure. Three linear vector arrays of arrangement 1 2, 1 4 and 1 8 have been designed to validate the proposed antenna performances as an array. The proposed antenna is light weighted, low cost, easy to fabricate and with better performances that makes it suitable for biomedical WLAN applications.

29 citations

Journal ArticleDOI
TL;DR: A renowned optimization algorithm, called Lion Algorithm (LA), is modified to adopt the minimized routing cost under the VANET and the performance of the proposed LA is compared with the existing algorithms by analyzing the convergence, routing cost and computational complexity.
Abstract: Vehicular Ad hoc Networks (VANETs) are a subdivision of Mobile Ad hoc Networks (MANETs), which take significant responsibility in the Intelligent Transportation System (ITS) domain for providing reliable road safety. Various researchers have dealt with the development under VANET for better routing. Yet, they found great difficulty in providing multi-constrained Quality of Service (QoS) to the network. To tackle the difficulty, the routing cost is determined by considering the congestion cost, travel cost, QoS awareness cost and collision cost, wherein the QoS awareness cost is estimated using fuzzification. In this paper, a renowned optimization algorithm, called Lion Algorithm (LA), is modified to adopt the minimized routing cost under the VANET. Further, the performance of the proposed LA is compared with the existing algorithms like, Genetic algorithm (GA) and LA by analyzing the convergence, routing cost and computational complexity. The proposed LA provides reliable routing with reduced cost and computational complexity.

20 citations

Journal ArticleDOI
01 Sep 2020-Robotica
TL;DR: The Grey Wolf-Second order sliding mode control (GW-SoSMC) is developed to control the manipulator of the inchworm robot to reduce the chattering phenomenon of SMC and improves the controlling ability of SoSMC by weightage function.
Abstract: The flexible motion of the inchworm makes the locomotion mechanism as the prominent one than other limbless animals. Recently, the application of engineering greatly assists the inchworm locomotion to be applicable in the robotic mechanism. Due to the outstanding robustness, sliding mode control (SMC) has been validated as a robust control strategy for diverse types of systems. Even though the SMC techniques have made numerous achievements in several fields, some systems cannot be comfortably accepted as the general SMC approaches. Accordingly, this paper develops the Grey Wolf-Second order sliding mode control (GW-SoSMC) to control the manipulator of the inchworm robot. The GW-SoSMC reduces the chattering phenomenon of SMC and improves the controlling ability of SoSMC by weightage function. Subsequently, it compares the performance of the proposed method with several conventional techniques like Grey Wolf-SMC (GW-SMC), FireFly-SoSMC (FF-SoSMC), Artificial Bee Colony-SoSMC (ABC-SoSMC), Group Searching-SoSMC (GS-SoSMC), and Genetic Algorithm-SoSMC (GA-SoSMC). It portrays the valuable comparative analysis by measuring the accomplished joint angles, error, and response of the controller. Thus the proposed method discovers the supervisory controller for the inchworm robot that is immensely better than conventional controllers mentioned earlier.

18 citations