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Related Experiment Video

Updated: Aug 7, 2025

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

A High-Relative-Bandwidth Doherty Power Amplifier with Modified Load Modulation Network for Wireless Communications.

Haipeng Zhu¹, Zhiwei Zhang¹, Chao Gu²

¹School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China.

Sensors (Basel, Switzerland)

|March 11, 2023

Summary

This study introduces a new load modulation network for broadband Doherty power amplifiers (DPAs). The novel design achieves an 86% relative bandwidth, enabling high efficiency across a wide frequency range.

Keywords:

Doherty power amplifier broadband load modulation network relative bandwidth

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Area of Science:

Electrical Engineering
Microwave Engineering
RF Power Amplification

Background:

Doherty power amplifiers (DPAs) are crucial for efficient wireless communication.
Achieving broadband operation in DPAs while maintaining high efficiency is a significant challenge.

Purpose of the Study:

To present a novel load modulation network for realizing a broadband Doherty power amplifier (DPA).
To theoretically analyze and experimentally validate the performance of the proposed broadband DPA.

Main Methods:

Design and analysis of a load modulation network using generalized transmission lines and a modified coupler.
Theoretical analysis of the DPA's operation principles and bandwidth characteristics.
Fabrication and measurement of a prototype broadband DPA operating from 1.0 GHz to 2.5 GHz.

Main Results:

A theoretical relative bandwidth of approximately 86% was achieved.
The fabricated DPA delivered 43.9-44.5 dBm output power with 63.7-71.6% drain efficiency at saturation.
Drain efficiency of 45.2-53.7% was maintained at a 6 dB power back-off level.

Conclusions:

The proposed load modulation network effectively enables broadband operation in DPAs.
The developed DPA demonstrates high output power and excellent drain efficiency across a wide frequency band.
This work provides a viable design methodology for large-relative-bandwidth DPAs.