Design of phased array antenna for active beamforming at 2.4 GHz

106-112This paper presents design of phased array antenna (PAA) using RF beamformer and emphasizes design of planar microstrip patch antenna array with right hand circular polarization (RHCP) operating at 2.4 GHz. Comparison of two responses of antenna array for two non-uniform amplitude distributions in terms of beam width and side lobes at different scan angles has been made. RF beamformer for electronic beamsteering is also simulated

Class-E power amplifier and its linearization using analog predistortion

144-152In this paper, power amplifier operating with center frequency of 947.5 MHz, which can be used for the transmitter in beamforming systems, is proposed. The power amplifier implemented provides high power added efficiency (PAE) of 71.967% and low noise figure (NF) as low as 1.525. The linearity of the power amplifier is improved by using square law and cubic law analog predistortion techniques. The power amplifier is designed and implemented using 0.35 µm CMOS technology. The power amplifier implemented provides high SNR of 82.723 and the linearity is improved by suppressing the power in the 2nd and 3rd order harmonics

Characterization of nanomembrane using nylon-6 and nylon-6/poly (e-caprolactine) blend

211-216This study is mainly focused on characterization of nanomembrane using nylon-6 and its blend with <span style="color:black; mso-ansi-language:EN-IN">poly (e- caprolactine) (PCL). Nylon-6 nanomembrane h<span style="color:black;mso-ansi-language: EN-IN">as been developed using formic acid at four different viscosity levels of 158.4, 420.8, 920.8 and 1417 cPs. Another nanomembrane of nylon<span style="color:black;mso-ansi-language: EN-IN">-6/PCL (80:20<span style="color:black;mso-ansi-language: EN-IN">) blend has also been developed using nylon-6 polymer solution viscosity of 1417 cPs at three different polymer concentrations (8<span style="color:black;mso-ansi-language: EN-IN">, 10 and<span style="color:black;mso-ansi-language: EN-IN" lang="EN-GB"> 12%) of PCL. The characterization of nanomebrane <span style="color:black;mso-ansi-language: EN-IN">is done using scanning electron microscope and Fourier transformed infrared. It is observed that the nanomebrane of 80:20 blend ratio of nylon-6/PCL at 1417 cPs <span style="color: black;mso-ansi-language:EN-IN">nylon-6 viscosity and 12 % concentration of PCL produces uniform fibre structure. </span