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Doherty amplifier using load modulation and phase compensation DGS microstrip line

Choi, Heungjae, Lim, Jong-sik, Jeong, Yong-chae and Kim, Chul-dong 2006. Doherty amplifier using load modulation and phase compensation DGS microstrip line. Presented at: 36th European Microwave Conference 2006, Manchester, England, 10-15 September 2006. 2006 European Microwave Conference. Picastaway: IEEE, pp. 352-355. 10.1109/EUMC.2006.281346

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Abstract

In this paper, a new Doherty power amplifier having the ideal harmonic termination condition that has been usually ignored is proposed. A defected ground structure (DGS) is adopted on the ground pattern of the output lambda/4 impedance inverter of the carrier amplifier and output offset transmission line of the peaking amplifier that are essential for proper load modulation operation of a conventional Doherty amplifier. As a result of the second and third harmonic termination, excellent improvement in power added efficiency (PAE), gain, maximum output power as well as linearity is obtained. The acquired improvements in gain, maximum output power (P1dB), PAE and adjacent channel leakage ratio (ACLR) to WCDMA 2FA signal are 0.42dB, 0.33dB, 12.7%, and 5.1dB, respectively. Moreover, physical length of microstrip line is shortened fairly by DGS, therefore the whole amplifier circuit size is considerably reduced

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: IEEE
ISBN: 9782960055160
Last Modified: 04 Jun 2017 07:52
URI: http://orca.cf.ac.uk/id/eprint/69002

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