SOUMYADEEP DAS
@technoindiauniversity.ac.in
Assistant professor in Dept. of Electronics and Communication Engineering
Techno India University, West Bengal
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering, Multidisciplinary, Biomedical Engineering, Electronic, Optical and Magnetic Materials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Shalini Patel, Soumyadeep Das, Debasis Mitra, Subhasis Sarkar, and Chaitali Koley
IEEE
For dielectric characterisation of liquids, a novel microwave sensor is designed on the concept of metamaterial (MTM) by using complementary split ring resonator (CSRR). This work describes an MTM based high-sensitivity microwave sensor with a PDMS channel that can be used for any kind of liquid detection and in a number of biomedical applications. On the ground plane of a dielectric substrate, three CSRRs with squared shapes are engraved. A planar microstrip-line (MTL) carved on the substrate's bottom side generates a time-varying electric field that is connected to the sensor cells to stimulate them. The sensor has been built on a Rogers RT6002 dielectric substrate. The sensitivity of the proposed sensor is demonstrated in laboratory tests with a variety of liquid samples using a Vector Network Analyzer (VNA) setup, where the frequency is different for different dielectric constants. The designed sensor has a remarkable ability to detect minor dielectric variations, in addition to having other beneficial qualities including compact size, easy manufacture, cheap, nonionizing nature, and no risk to human health. The use of the proposed sensor along with additional microwave components for non-invasive disease diagnosis may be encouraged by such crucial properties.
Soumyadeep Das, Debasis Mitra, Arvind S. Chezhian, Bappaditya Mandal, and Robin Augustine
Frontiers Media SA
In this paper, a conformal absorber metasurface has been designed and used for reducing the specific absorption rate (SAR) of an implantable antenna. SAR reduction of implantable antennas is one of the significant design aspects to be considered for their use in modern-day healthcare applications. The introduction of the absorber metasurface restricts the back radiation of the antenna to control the SAR value. This technique decreases the maximum SAR value by 24% and also reduces the average SAR distribution significantly without affecting the desired antenna gain. A reduction in SAR value indicates the decrease in radiation absorption by human tissue, and thus, decreases the possibility of health hazards due to EM radiation. Later, this antenna-absorber system is designed as a capsule module for increased mobility and less-invasiveness. The redundancy of invasive surgery increases acceptance of the capsule module designs of implantable antennas and devices for various biomedical usages. In vitro testing of the fabricated prototype has been carried out inside a multi-layer porcine slab to verify the effectiveness of this unique SAR reduction technique.
Soumyadeep Das, Manjushree Tamang, Naveen Kumar Vishwakarma, CA Sreejith, and K.S. Beenamole
IEEE
This paper proposes the design of a wideband and relatively wide beam Guard antenna for radar applications. The antenna has been designed around the concept of a Linear Resonant Slotted Waveguide Antenna. The antenna is required to work in the X band, covering a bandwidth of 500 MHz. The design and simulation have been done on HFSS. The return loss is less than 10 dB and the gain of the guard antenna is better than 14.6 dBi over the 500MHz band.
Soumyadeep Das, Mohankumar K, Sreejith CA, Iqbal Ahmed Khan, and Beenamole K.S.
IEEE
This paper describes the design of a Cavity Backed Slot Array Antenna (CBSA) for Radar applications. The antenna array is required to operate in the X-band and to form a very low side lobe (Average SLL <-35dB), HPBW 1.9 deg in the Az plane and minimum 26dBi gain over the whole frequency band of 400MHz (4% bandwidth). The main objective of this work is to enhance the impedance and pattern bandwidth and gain of the array antenna. The proposed antenna has been designed and optimised for its electrical performance and dimensions by 3D EM solvers. To meet all the functional and mechanical requirements, an antenna leads to a linear array of a total of 96 radiating elements.
Soumyadeep Das, Adarsh Singh, Rajarshi RoyChowdhury, and Debasis Mitra
IEEE
Electrical property estimation for multilayer biological tissue model has been carried out and reported in this literature. Two Ultra Wideband (UWB) antennas has been used for estimation. Transmission parameters are used in this technique. Ideal permittivity of the multilayer tissue has been calculated using Bruggeman's equation. Comparison of the estimated value with this ideal dataset shows desired alignment. Mean and standard deviation of the estimated permittivity of multilayer tissue are found to be 26.86 and 2.05 respectively.
Soumyadeep Das, Debasis Mitra, Bappaditya Mandal, and Robin Augustine
Springer Science and Business Media LLC
Soumyadeep Das and Debasis Mitra
Informa UK Limited
ABSTRACT In this paper the design of a simple rectangular ring slot, co-planar waveguide (CPW) fed, implantable antenna is proposed. By corner perturbation and the introduction of metallic patterns on the superstrate of the antenna, circular polarization (CP) has been achieved. The 10 mm × 10 mm × 0.4 mm dimensions have made the antenna compact and suitable for implantable biomedical application around 2.45 GHz Industrial, Scientific and Medical (ISM) band. Measurement setup comprising of pork slab has been established and the in-vitro analysis of the antenna prototype is carried out by inserting the prototype into it. An axial ratio bandwidth of 10.6% has been achieved for the proposed simple implantable CP antenna.
Debasis Mitra, Soumyadeep Das, and Shubhadip Paul
IEEE
Specific Absorption rate (SAR) is one of the most important aspects of biomedical implantable antenna system. It provides the measure of the rate at which energy is absorbed by the human body when exposed to a radio frequency (RF) electromagnetic field. Despite of having the hazards of damaging human tissues due to power absorption and heating, the implantable antennas are of utmost necessity for recent bio-telemetry applications. Hence, the challenge is to reduce the SAR without affecting the normal antenna parameters and effectively keep it inside an IEEEC9S.1-1999 specified value (1.6 W/Kg for 1 g tissue model). In this paper by using a ferrite sheet we have significantly reduced SAR value of an implantable monopole antenna. By this technique about 42% reduction of SAR value has been achieved without compromising the other antenna parameters.
Soumyadeep Das and Debasis Mitra
Institute of Electrical and Electronics Engineers (IEEE)
In this communication, a coplanar waveguide-fed, compact, wideband dual-ring slot antenna for biomedical applications in the Industrial, Scientific and Medical frequency band is presented. This implantable antenna is designed using thin and biocompatible substrate–superstrate layers to achieve human body insulation as well as flexibility. Despite showing good antenna performances, only the realized gain value is observed to be reduced (−12 dB). To improve the antenna gain, a metamaterial (MTM) array with epsilon very large behavior has been introduced on the superstrate of the implantable antenna. Using the MTM, about 3 dB gain enhancement has been observed. Even after the introduction of the MTM superstrate, wideband characteristic and flexibility are maintained. Also, the specific absorption rate (SAR) analysis of the antenna configuration with and without MTM has been studied. A low SAR is obtained in both the cases. The fabricated antenna parameters have been measured with the in vitro test by immersing the antenna inside a single-layer tissue emulating gel, as well as, inside a chicken breast slab.
Soumyadeep Das, Parikhit Dutta, and S.K. Ghorai
IEEE
In this paper we propose a Radio-over-Fibre (RoF) downlink system for dual frequency millimetre wave (mm wave) signal generation. We externally modulate two 1550 nm Laser sources using balanced Mach Zehnder Modulators (MZM). A 12 GHz Radio Frequency (RF) signal is used for modulation. The two MZMs separate out the odd and even order sidebands each. The MZM modulated optical signal is intensity modulated by a 5 Gbps baseband signal. Single Mode Fibre (SMF) is used as a transmission medium between Central Station (CS) and Base Station (BS). A PIN photo-detector at the BS is used to detect the electrical signal and generate mm wave electrical signals by means of frequency multiplication. The mm wave signals contain the baseband data and are propagated into the wireless medium. Simulation ensures good performance for this 5Gbps RoF downlink system. A power penalty of less than 0.6dB is achieved for a bit error rate (BER) of 10−9 after transmitting successfully for a length of 80km over a single mode fibre.