Generalised MIT in a tri‐band LNA. Issue 2 (1st January 2017)

• Record Type: Journal Article
• Authors: Guan, Yangyang; Wu, Yongle; Li, Mingxing; Wang, Weimin; Liu, Yuanan
• Is Part Of: IET microwaves, antennas & propagation. Volume 11:Issue 2(2017)
• Page Start: 294
• Page End: 302
• Publication Date: 2017-01-01
• Subjects: impedance convertors -- low noise amplifiers -- printed circuits -- UHF amplifiers; generalised MIT -- generalised multiband impedance transformer -- frequency‐dependent complex loads -- multiple‐arbitrary bands -- multiple‐frequency‐selection section -- series‐parallel branch -- PI‐shape impedance transformer -- multiple‐series transmission lines -- analytical equations -- electrical parameters -- printed circuit board -- single‐stage tri‐band low‐noise amplifier -- single‐stage tri‐band LNA -- minimum input return loss -- output return loss -- minimum input third‐order intercept points -- noise figure -- bandwidth 400 MHz -- bandwidth 250 MHz -- bandwidth 50 MHz -- gain 15 dB -- gain 12 dB -- gain 7 dB -- loss ‐24 dB -- loss ‐13 dB -- loss ‐11 dB -- frequency 1.5 GHz to 2.6 GHz -- noise figure 1.9 dB -- noise figure 2.6 dB -- noise figure 5.0 dB; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2016.0071
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : In this study, the authors propose a generalised multiband impedance transformer (MIT), which can transform the frequency‐dependent complex loads at multiple arbitrary bands simultaneously. The proposed transformer has two parts: the multiple frequency‐selection sections consisted of the series–parallel branches and the π‐shape impedance transformer is composed of the multiple series transmission lines. Analytical equations are derived for the closed‐form solutions and the rules of electrical parameters. Numerical examples are examined to verify the validity. On the basis of printed circuit board, a single‐stage tri‐band low‐noise amplifier (LNA) with the proposed MIT is designed, simulated, and measured for practical application. The measured LNA maintains the tri‐band performance and the 3 dB bandwidths are 400, 250, and 50 MHz with the 15, 12, and 7 dB minimum gain, respectively. The minimum input return losses are −24, −13, and −11 dB corresponding to the three bands, and the output return loss is lower than −10 dB from 1.5 to 2.6 GHz. The minimum input third‐order intercept points are 4.1, 6.2, and 14.7 dBm, respectively. Besides, the noise figures (NFs) are 1.9, 2.6, and 5.0 dB separately at the centre frequencies of 1.8, 2.23, and 2.47 GHz.