Qualification: 
M.Tech
betsyg@am.amrita.edu

Betsy George currently serves as a Research Trainee at the Amrita Center for Wireless Networks and Applications, Amrita Vishwa Vidyapeetham.

Publications

Publication Type: Conference Paper

Year of Publication Publication Type Title

2018

Conference Paper

Betsy George, Bhuvana, N. S., and Dr. Sreedevi K Menon, “Design of edge coupled open loop metamaterial filters”, in 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), St. Petersburg, Russia, 2018.[Abstract]


Metamaterials with negative index of refraction has created great opportunities for novel applications at Radio Frequency. Metamaterial finds applications as filters, diplexers and as frequency selective surfaces for gain enhancement in antennas. In this work open loop filters with circle, triangle and pentagonal geometries are proposed which can be configured as metamaterial for various wireless applications. These metamaterials can be energised using different feeding mechanisms like edge coupling, electromagnetic coupling, inductive coupling, capacitive coupling etc. Proposed filters are energised using edge coupled feeding mechanism which has reduce complexity compared to other techniques. Edge coupling also ensures the tunability of the filters and make them applicable for low frequency, where the conventional planar filters consumes large area. The geometrical variations in the loop are found to influence the filter characteristics and this is studied in detail. Design equations are furnished for the filters based on the extensive analysis carried out using ANSYS High Frequency Structure Simulator (HFSS) using finite element method. The current distribution and electric field of the proposed filters are also analysed in detail. Filter prototypes with optimum performance as seen in the simulations are fabricated and measured using Keysight ENA 5080A Network Analyser. Good agreement is found to exist between experimental results and the simulated results for the designed filters. A comparative study is carried out based on the frequency of operation, bandwidth and the attenuation of the three designed filters among themselves and the previous works that authors referred into.</p>

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2018

Conference Paper

Betsy George, Nair, S. B., and Dr. Sreedevi K Menon, “Investigations on edge coupled metamaterial filters”, in 2017 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), Chennai, India, 2018.[Abstract]


Artificially engineered materials, like metamaterials can be used to enhance the performance of devices. Split-ring resonators (SRRs) is the most widely used metamaterial at microwave regime. In this paper, edge coupled metamaterial filter using SRR with band stop characteristics in the frequency spectrum is proposed. Exhaustive simulations are conducted to understand the properties of the filter. The effects of the geometrical parameters on the resonance frequency are investigated. The proposed filter prototypes are tested using Vector Network Analyser and thus simulated results are validated.

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2018

Conference Paper

Betsy George, Bhuvana, N. S., and Dr. Sreedevi K Menon, “Compact band pass filter using triangular open loop resonator”, in 2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), Singapore, Singapore, 2018.[Abstract]


Recent developments in wireless communication challenges microwave filters with more demanding requirements such as small size, light weight, high performance and low cost. Microstrip resonator have the higher performance than the conventional filtering technique for microwave devices. A triangular open loop resonator energized using electromagnetic (EM) and edge coupling is presented in this paper. Microstrip line is modified as a triangular open-loop resonator that introduces additional capacitance and inductance by re-orientation of electromagnetic field, there by selecting the operating frequencies. Depending on the type of coupling and position of the feed used the operating frequency of the filter changed for the same dimensions. EM and edge coupling is given to the resonator, when its gives band pass filters at 2.45 GHz and the effect of each coupling techniques are studied in detail. Better size reduction is observed for EM coupling than the edge coupling. The filters characteristics are analyzed in substrate FR4 epoxy by using ANSYS High Frequency Structure Simulator (HFSS) software. The design equations for the resonator predicts the frequency with less than 2% error with the simulated frequency. The optimized triangular open loop resonators are fabricated and validated using Keysight ENA 5080A Vector network Analyser. The simulated and measured of the resonator filter are comparable for center frequency, bandwidth, return loss and attenuation.

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2017

Conference Paper

Betsy George, ,, and Dr. Sreedevi K Menon, “Compact Bandpass Filter Using Triangular Open-Loop Resonator”, in Electromagnetics Research Symposium (PIERS), Singapore, 2017.

2017

Conference Paper

Betsy George, A, S. Mol, and Dr. Sreedevi K Menon, “Microstrip Resonator as Microfluidic Sensor for Blood-Glucose Monitoring ”, in 2nd International Conference on Communication and Electronics Systems (ICCES 2017), 2017.

2017

Conference Paper

Betsy George and S, B. Nair, “Equivalent Circuit and Validation of a Direct Coupled Hexagonal Split Ring Resonator”, in International Conference on Intelligent Sustainable Systems (ICISS 2017), 2017.

Publication Type: Conference Proceedings

Year of Publication Publication Type Title

2017

Conference Proceedings

Betsy George, “ Investigation On Edge Coupled Metamaterial Filters”, IEEE International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET 2017). SSN Collage of Engineering Chennai, 2017.

2017

Conference Proceedings

Betsy George, “Design of Edge Coupled Open Loop Metamaterial Filters”, PIERS 2017. St. Petersburg, 2017.

207
PROGRAMS
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AMRITA
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CONSTITUENT
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GRADE BY
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RANK(INDIA):
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