Nemai C. Karmakar

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This review article presents an overview of the soil moisture measuring technique using microwave radiometry. Remote sensing of soil moisture is a promising field of research if accuracy can be achieved. The optimal frequency to estimate at this state using microwave radiometry is at L-band (~1.4GHz). In this article analysis of basics of soil microwave(More)
In this paper, a low cost, printable chipless RFID humidity sensor is presented. The RFID sensor is based on planar stepped impedance resonator (SIR) structure. Humidity sensing mechanism is incorporated using dielectric change of commercially available Kapton HN polyamide. A prototype sensor is designed, fabricated and tested with standard experimental(More)
A highly sensitive, passive relative humidity (RH) sensor using polyvinyl-alcohol (PVA) dielectric film is presented. For the first time, PVA is investigated in microwave RF sensing devices for low cost, high resolution and accurate chipless RH sensor realization. Comparative study with traditional humidity sensing Kapton polymer is presented to validate(More)
Ultra wide band (UWB) impulse radio (IR) technology has different applications in different sectors such as short range radios and collision avoidance radar. A strong signal denoising method is needed for UWB-IR signal detection. One of the challenges of UWB-IR signal detection technique is the environmental interferences and noises. Wavelet Packet(More)
In this paper, we present the low noise amplifier using new feedback connection configurations. The UWB LNA is design in 0.18 m TSMC CMOS technique to achieve high gain, small size and low noise. The LNA achieved 11 dB of average power gain, low 2.87 dB noise figure (NF), -10.9 dB input match, -7 dB return loss, -3 dBm of IIP3 and only 0.54 mm size with 15(More)
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(More)
A novel idea of applying a proposed radio frequency transducer architecture for wireless monitoring of sleep apnoea patients has been presented in this article. The architecture has been realized on a primary prototype and tested from baseband to 2.5 GHz band. The experimental results prove that this architecture can be used for wireless sleep apnoea(More)
We have analyzed the four-wave mixing (FWM) characteristics with optimum time-delays between pump and probe pulses in semiconductor optical amplifiers (SOAs) by the finite-difference beam propagation method (FD-BPM). The study of FWM characteristics with optimum time-delays between pump and probe pulses in SOAs has the importance to achieve the high FWM(More)