Title :
Linearity Improved Doherty Power Amplifier Using Composite Right/Left-Handed Transmission Lines
Author :
Ji, Seung Hun ; Eun, Sang Ki ; Cho, Choon Sik ; Lee, Jae W. ; Kim, Jaeheung
Author_Institution :
Sch. of Electron., Korea Aerosp. Univ., Goyang
Abstract :
A Doherty power amplifier using composite right/left-handed transmission lines (CRLH-TL) is proposed for linearity improvement. The lambda/4 transmission line incorporating CRLH-TL is designed to suppress the second harmonic of the output of the main amplifier. The output power of the proposed power amplifier at the fundamental frequency (2.30 GHz) shows 31.0 dBm with 13 dBm input power excited. The Doherty power amplifier using CRLH-TL improves the linearity considerably compared to that without employing CRLH-TL.
Keywords :
UHF power amplifiers; harmonic analysis; transmission lines; Doherty power amplifier; composite right-left-handed transmission lines; frequency 2.30 GHz; fundamental frequency; power input; second harmonic suppression; Delay; Digital modulation; Frequency; High power amplifiers; Impedance; Linearity; Power amplifiers; Power generation; Power transmission lines; Transmission line theory; Composite right/left-handed transmission line (CRLH-TL); Doherty power amplifier;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.2001014
