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High Power and High Efficiency Doherty Power Amplifier Design at 8GHz for Drone Application

Creative Commons 'BY' version 4.0 license

New generation Drone transceiver systems require high linearity and high efficiency power amplifiers. Consumers need more transmitter range, hence more output power from a Power Amplifier. Doherty Power amplifier has been chosen for this application as it provides both high inearity and high efficiency. In this thesis DPA is designed for greater than 4W output power at 8GHz frequency, to be used as Phased array elements so as to provide a power combined output power of 40W for long range Drone transmission. The range of the Drone can be increased significantly with this approach.

A high power and high efficiency, linear Doherty Power Amplifier is designed at 8GHz X band frequency using Cree’s 0.25um Discrete GaN HEMT DFN packaged power amplifiers. An output power of 38dBm is to be achieved and a gain of 12dB. The Doherty PA is housed on a Roger 4350B PCB. 50V supply voltages are used. The DC current is 40mA per PA. The target drain efficiency of 60% to be achieved. The PA was fabricated and performance issues has been discussed.

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