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Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq, Ahmed M.; Yahya, Maan A.; McEwan, Neil; Rayit, Ashwain; Abd-Alhameed, Raed A.; Ojaroudi Parchin, Naser; Al-Yasir, Yasir I. A.; Noras, James

Authors

Ahmed M. Abdulkhaleq

Maan A. Yahya

Neil McEwan

Ashwain Rayit

Raed A. Abd-Alhameed

Yasir I. A. Al-Yasir

James Noras



Abstract

Power amplifiers in modern and future communications should be able to handle different modulation standards at different frequency bands, and in addition, to be compatible with the previous generations. This paper reviews the recent design techniques that have been used to operate dual-band amplifiers and in particular the Doherty amplifiers. Special attention is focused on the design methodologies used for power splitters, phase compensation networks, impedance inverter networks and impedance transformer networks of such power amplifier. The most important materials of the dual-band Doherty amplifier are highlighted and surveyed. The main problems and challenges covering dual-band design concepts are presented and discussed. In addition, improvement techniques to enhance such operations are also exploited. The study shows that the transistor parasitic has a great impact in the design of a dual-band amplifier, and reduction of the transforming ratio of the inverter simplifies the dual-band design. The offset line can be functionally replaced by a Π-network in dual-band design rather than T-network.

Journal Article Type Article
Acceptance Date Jun 2, 2019
Online Publication Date Jun 6, 2019
Publication Date 2019
Deposit Date Feb 21, 2022
Publicly Available Date Feb 21, 2022
Journal Electronics
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 8
Issue 6
Article Number 638
DOI https://doi.org/10.3390/electronics8060638
Keywords dual-band Doherty power amplifier; LTE-advanced; high-efficiency; phase offset lines; impedance inverter network; phase compensation network
Public URL http://researchrepository.napier.ac.uk/Output/2840270

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