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Lahbib Zenkouar
Mohammed V University
Computer Science & IT Electrical & Electronics Engineering

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Design of 10 to 12 GHz Low Noise Amplifier for Ultrawideband (UWB) Syste Toulali Islam; Lahbib Zenkouar
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 5: October 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (353.915 KB) | DOI: 10.11591/ijece.v8i5.pp2773-2779

Abstract

Balanced amplifier is the structure proposed in this article, it provides better performance. In fact, the single amplifier meets the specification for noise figure and gain but fails to meet the return loss specification due to the large mis-matches on the input & outputs. To overcome this problem one solution is to use balanced amplifier topography. In this paper, a wide-band and highgain microwave balanced amplifier constituted with branch line coupler circuit is proposed. The amplifier is unconditionally stable in the band [9-13] GHz where the gain is about 20dB. The input reflection (S11) and output return loss (S22) at 11 GHz are -33.4dB and -33.5dB respectively.
Modeling of a Microwave Amplifier Operating around 11 GHz for Radar Applications Mohammed Lahsaini; Lahbib Zenkouar; Seddik Bri
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 5: October 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (469.876 KB) | DOI: 10.11591/ijece.v8i5.pp3496-3503

Abstract

The low noise amplifier is one of the basic functional blocks in communication systems. The main interest of the LNA at the input of the analog processing chain is to amplify the signal without adding significant noise. In this work, we have modeled a LNA for radar reception systems operating around 11 GHz, using the technique of impedance transformations with Smith chart utility. The type of transistor used is: the transistor HEMT AFP02N2-00 of Alpha Industries®. The results show that the modeled amplifier has a gain greater than 20 dB, a noise figure less than 2 dB, input and output reflection coefficients lower than -20 dB and unconditional stability.
Co-Authors Mohammed Lahsaini Seddik Bri Toulali Islam