Electronics and Communication Engineering

This paper presents the Adaptive filtering technique used for audio quality enhancement by minimizing noise present into the speech signal. Here, the adaptive noise cancellation system is implemented on FPGA using Xilinx system generator (XSG). The two basic adaptive algorithms least mean square (LMS) and Leaky least mean square (LLMS) has been implemented to minimize the noise present into the speech signal. Various performance parameters used in ANC system design have been analyzed and compared. These parameters are SNR improvement, Mean Square Error (MSE), convergence behavior and hardware resources utilization. Result shows that LLMS algorithm performed best compared to LMS algorithm at the cost of hardware resource utilization.

This paper suggests the design of a compact two-pole bandpass filter based on the via-free composite right/left-handed (CRLH) metamaterial transmission line (TL) structure with radial stubs. The Bandpass Filter (BPF) design uses these sub wavelength resonators (CRLH unit cell) along with admittance inverters to control the coupling. It is found that the suggested method enables up to 70% size reduction from the conventional filters such as the parallel coupled type which is generally designed on the basis of the half-wavelength ...

In this paper a wideband half-split multilayer cylindrical dielectric resonator antenna (MCDRA) fed through coaxial probe is developed and discussed. The concept of multi layers is introduced in half-split dielectric resonator antenna for getting wide bandwidth. The design parameters of an antenna such as arrangement of dielectric layers, probe height and DR aspect ratio are investigated. The proposed multilayer cylindrical dielectric resonator antenna is excited with TM 21δ mode. The proposed structure provides~ 60% impedance ...

A novel via-free microstrip Left Handed (LH) Transmission Line (TL) utilizing Radial Stubs (RS) is proposed. The microstrip RS is approximated by a series combination of inductance and capacitance. The electrical equivalent circuit of LH TL unit cell including the equivalent inductance and capacitance of radial stub is discussed. The balanced and unbalanced LH TL is implemented in microstrip technology and backward waves are confirmed by both full wave simulations and experiments. Additionally an open-circuited Zeroth Order Resonators (ZOR) with their resonating properties in balanced and unbalanced left handed transmission lines are also verified by full wave simulations and experiments.

A novel via-free microstrip Left Handed (LH) Transmission Line (TL) utilizing Radial Stubs (RS) is proposed. The microstrip RS is approximated by a series combination of inductance and capacitance. The electrical equivalent circuit of LH TL unit cell including the equivalent inductance and capacitance of radial stub is discussed. The balanced and unbalanced LH TL is implemented in microstrip technology