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    Nemai Karmakar

    A novel method for reading multi-resonator based chipless RFID tags using an UWB linear chirp signal is presented in this paper. For the reader, a coherent frequency modulated continuous wave (FMCW) bi-static radar receiver architecture... more
    A novel method for reading multi-resonator based chipless RFID tags using an UWB linear chirp signal is presented in this paper. For the reader, a coherent frequency modulated continuous wave (FMCW) bi-static radar receiver architecture is used. A signal processing technique based on Hilbert transform is used to decode tag's data by detecting both amplitude and phase information. Accurate detection of the tag is achieved in simulations. With this interrogation technique, a very low cost chipless RFID reader with only one voltage controlled oscillator (VCO) is possible. In contrast to previous generation readers, this reader does not need any calibration tag to decode data.
    ... Shakil Bhuiyan #2 and Nemai Karmakar#3 # Department of Electrical & Computer Systems Engineering, Monash University, Building 72, Clayton Campus, 3800 VIC, Australia 1aminul.islam@monash.edu ... [2] S. Botao , C. Qiang, Y.... more
    ... Shakil Bhuiyan #2 and Nemai Karmakar#3 # Department of Electrical & Computer Systems Engineering, Monash University, Building 72, Clayton Campus, 3800 VIC, Australia 1aminul.islam@monash.edu ... [2] S. Botao , C. Qiang, Y. Amin, D.Mendoza et al, “An Ultra-low ...
    ABSTRACT This paper provides a short overview on the state of the art in electromagnetic transduction based chipless RFID sensors. These types of sensors can be used for various applications including structural health monitoring,... more
    ABSTRACT This paper provides a short overview on the state of the art in electromagnetic transduction based chipless RFID sensors. These types of sensors can be used for various applications including structural health monitoring, pressure, airflow and displacement detection, temperature, humidity, partial discharge monitoring and so on. A novel concept of high resolution crack sensing using super wideband antenna is also introduced here along with a brief review on airflow and partial discharge sensors.
    ABSTRACT The novel beam steering technique of a phased array antenna using electromagnetic bandgap (EBG) assisted beam forming network is presented. Square patterned uniform EBG cells perturb the feedline of the antenna element of a... more
    ABSTRACT The novel beam steering technique of a phased array antenna using electromagnetic bandgap (EBG) assisted beam forming network is presented. Square patterned uniform EBG cells perturb the feedline of the antenna element of a 4-element microstrip antenna array. ...
    4th generation chipless tag based on multiresonators is presented. The tag consist of a UWB monopole antenna loaded with multiple cascaded spiral EBGs which have a 1:1 correspondence with data bits. The 4th generation tag is less... more
    4th generation chipless tag based on multiresonators is presented. The tag consist of a UWB monopole antenna loaded with multiple cascaded spiral EBGs which have a 1:1 correspondence with data bits. The 4th generation tag is less sensitive to tag orientation and has smaller size than earlier generations of the tag. A proof-of-concept tag is developed and tested which has
    Defected ground structure (DGS) has been analysed in terms of various microstrip discontinuities (quasi static approach). It has been shown that the junction capacitance plays an equally important role in determining the position of... more
    Defected ground structure (DGS) has been analysed in terms of various microstrip discontinuities (quasi static approach). It has been shown that the junction capacitance plays an equally important role in determining the position of attenuation pole of the unit cell DGS as the gap capacitance. Theory is validated against simulation results by commercially available MoM Solver CST design environment. Good agreements between simulated and calculated results validate the theory.
    ... So far, the only commercially available chipless RFID tag is the SAW tag (developed by RF SAW®) but they are not fully printable and planar due to their piezoelectric nature [5]. The tagging of extremely low cost paper/plastic based... more
    ... So far, the only commercially available chipless RFID tag is the SAW tag (developed by RF SAW®) but they are not fully printable and planar due to their piezoelectric nature [5]. The tagging of extremely low cost paper/plastic based items demands a fully passive and printable ...
    ... acrylamide. T. Tripathy a , SR Pandey a , NC Karmakar a , RP Bhagat b and RP Singh Corresponding Author Contact Information , E-mail The Corresponding Author , b.a Materials Science Centre, IIT, Kharagpur 721302, India. ...
    Narottam Kumar Das 1), Nemai Chandra Karmakar1), Yasuhiro Yamayoshi2), and Hitoshi Kawaguchi2) ... 1) Faculty of Engineering, Monash University, Clayton Campus, VIC 3168, Australia. Tel: +61 3 9905-1252, Fax: +61 3 9905 3454, E-mail: ...
    ... Electrical and Computer Systems Engineering Faculty of Engineering, Monash University, Clayton, VIC 3168, Australia Email: narottam.das@eng ... REFERENCES [1] GP Agrawal and NA Olsson, "Self-phase modulation and spectral... more
    ... Electrical and Computer Systems Engineering Faculty of Engineering, Monash University, Clayton, VIC 3168, Australia Email: narottam.das@eng ... REFERENCES [1] GP Agrawal and NA Olsson, "Self-phase modulation and spectral broadening of optical pulses in semiconductor ...
    Abstract—We have numerically analyzed the basic characteristics of all-optical demultiplexing (DEMUX) based on four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs). For obtaining the high ON-OFF ratio, the optimum input pump... more
    Abstract—We have numerically analyzed the basic characteristics of all-optical demultiplexing (DEMUX) based on four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs). For obtaining the high ON-OFF ratio, the optimum input pump pulsewidth is 1~3 ps for 1 ps, ...
    Abstract-A fully printable, passive and planar chipless RFID tag on thin flexible substrate is presented. The chipless tag encodes data into the spectral signature using a multiresonating circuit. Both amplitude and phase components of... more
    Abstract-A fully printable, passive and planar chipless RFID tag on thin flexible substrate is presented. The chipless tag encodes data into the spectral signature using a multiresonating circuit. Both amplitude and phase components of the spectral signature are used for data ...
    In this paper a CAD program which speeds up the design of inductor and transformer layouts has been presented. The main advantages of this program are the easy-to-use and efficient interface which allows the user to create a wide range of... more
    In this paper a CAD program which speeds up the design of inductor and transformer layouts has been presented. The main advantages of this program are the easy-to-use and efficient interface which allows the user to create a wide range of different inductors in a short time, and without the need of a significant prior knowledge. The Expert Application Programming
    Road safety is a key problem in today's society. A novel application for the regulation of vehicle speed, trajectory, stopping and parking using chipless RFID tags installed into/on the road is proposed. The RFID reader with... more
    Road safety is a key problem in today's society. A novel application for the regulation of vehicle speed, trajectory, stopping and parking using chipless RFID tags installed into/on the road is proposed. The RFID reader with antennas installed under the vehicle scans the on-road tags and acquires essential regulatory data such as addresses, speed limits, parking permits. The chipless RFID
    ... The chipless RFID reader detects the resonances as attenuation in the magnitude and phase-jumps in the phase of the spectrum. The RFID reader operates between 1.9 and 2.5 GHz and can successfully detect a transponder at close range.... more
    ... The chipless RFID reader detects the resonances as attenuation in the magnitude and phase-jumps in the phase of the spectrum. The RFID reader operates between 1.9 and 2.5 GHz and can successfully detect a transponder at close range. The tag design can be transferred ...
    A RFID system with a chipless RFID tag on a 90-μm thin Taconic TF290 laminate is presented. The chipless tag encodes data into the spectral signature in both magnitude and phase of the spectrum. The design and operation of a prototype... more
    A RFID system with a chipless RFID tag on a 90-μm thin Taconic TF290 laminate is presented. The chipless tag encodes data into the spectral signature in both magnitude and phase of the spectrum. The design and operation of a prototype RFID reader is also presented. The RFID reader operates between 5 - 10.7 GHz frequency band and successfully detects
    The development of a simple low-cost RFID reader is presented. The RFID reader can operate in the frequency range between 2GHz and 2.5GHz. The reader is consisted of three main sections: AC (power supply) section, digital (control)... more
    The development of a simple low-cost RFID reader is presented. The RFID reader can operate in the frequency range between 2GHz and 2.5GHz. The reader is consisted of three main sections: AC (power supply) section, digital (control) section and the RF section. Amplitude shift keying (ASK) demodulation (envelope detector) is used for decoding the signal from the RFID transponders. Simulated
    ... This article reports our third generation chipless RFID tag with the following features over the first and second generation tags as reported in [4]-[5]: (i) the tag is printed on a flexible laminate Taconic TF-290 (εr=2.9, h=90μm... more
    ... This article reports our third generation chipless RFID tag with the following features over the first and second generation tags as reported in [4]-[5]: (i) the tag is printed on a flexible laminate Taconic TF-290 (εr=2.9, h=90μm ,tanδ=0.0028); (ii) the design is based on coplanar ...
    Research Interests:
    A novel chipless RFID transponder is presented that is both compact in size and robust in terms of performance. The transponder components have been designed and analysed using a full wave electromagnetic solver as well as with... more
    A novel chipless RFID transponder is presented that is both compact in size and robust in terms of performance. The transponder components have been designed and analysed using a full wave electromagnetic solver as well as with measurements using a vector network analyzer and in an anechoic chamber. The novel transponder consists of a linearly polarized UWB circular monopole antenna
    ABSTRACT
    A chipless tag RFID reader is presented for short range applications. The RFID reader is comprised of a digital section, RF section and cross-polarized reader horn antennas. The reader horn antennas are used to transmit and receive data... more
    A chipless tag RFID reader is presented for short range applications. The RFID reader is comprised of a digital section, RF section and cross-polarized reader horn antennas. The reader horn antennas are used to transmit and receive data to and from the chipless tags respectively. The chipless tags have unique spectral signatures which correspond to resonances present at different frequencies

    And 91 more