Design of a concurrent tri-band LNA based on composite right/left-handed transmission line resonators

Faycal El Hardouzi (Moulay Ismail University)
Mohammed Lahsaini (Moulay Ismail University)
Mustapha Bahich (Moulay Ismail University)
Badr Nasiri (Moulay Ismail University)
Younes Achaoui (Moulay Ismail University)

TELKOMNIKA (Telecommunication Computing Electronics and Control)
Vol 23, No 4: August 2025

This article presents a three-band low noise amplifier (LNA) in microstrip technology based on composite right left handed transmmision line (CRLH TL) resonators for multi-band behavior, which has been designed to meet all the criteria that determine the quality of its operation. The transistor used is biased via a transmission line and matched by λ/4 transformer filters with CRLH-TL type resonators at the output to establish multiband behavior with improved band rejection to suppress unwanted frequencies and interference. The results demonstrate excellent performance at three frequencies: 900 MHz (15.03 dB gain), 2.1 GHz (13.58 dB gain), and 3.5 GHz (12.57 dB gain), with a noise figure below 2 dB and unconditional stability. The size of the proposed amplifier is 73×63 ??2 in area.