A new design of Doherty amplifiers using defected ground structure

Choi, Heungjae ORCID: https://orcid.org/0000-0003-1108-293X, Lim, Jong-Sik and Jeong, Yong-Chae 2006. A new design of Doherty amplifiers using defected ground structure. IEEE Microwave and Wireless Component Letters 16 (12) , pp. 687-689. 10.1109/LMWC.2006.885636

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Abstract

In this letter, 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 (P1 dB), PAE, and adjacent channel leakage ratio to wideband code division multiple access 2FA signal are 0.33 dB, 0.42 dB, 12.7%, and 5.1 dB, respectively. Moreover, physical length of microstrip line is shortened fairly by DGS, therefore the whole amplifier circuit size is considerably reduced

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Additional Information:	Sponsored by: IEEE Microwave Theory and Techniques Society
Publisher:	IEEE
ISSN:	1531-1309
Last Modified:	04 May 2023 17:06
URI:	https://orca.cardiff.ac.uk/id/eprint/18868

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