Novel AESA Architecture for Earth Observation and Planetary Sciences

Aaron Pereira, Neil Weste, Derek Abbott, Said Al-Sarawi, Okan Yurduseven

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper we present a description and evaluation of Gallium Nitride (GaN) Transceivers within AESA frontends for space-based Synthetic-aperture radar (SAR). The GaN power switches are evaluated in a voltage mode Class-D (VMCD) RF amplifier and as a DC-DC converter. The efficiency of the circuit when evaluated as a Class D power amplifier (PA) is 73% at 250 MHz and delivers an output power of 37.3 dBm. The measured DC-DC converter circuit has an efficiency of over 89.7% at 100 MHz, delivering 38.6 dBm. These are the highest reported efficiencies for the RF PA and the switching modulator performance is comparable to state of the art at its respective operating frequencies. A flat panel metasurface antenna topology that can be integrated into the RF front end to facilitate a variety of SAR modalities. This antenna structure can substantially simplify the deployment mechanism of airborne and spaceborne SAR instruments.
Original languageEnglish
Title of host publication2021 IEEE Aerospace Conference (50100): Proceedings
Publication statusPublished - 07 Jun 2021
EventIEEE Aerospace Conference - Big Sky, United States
Duration: 06 Mar 202113 Mar 2021

Publication series

Name IEEE Aerospace Conference (50100): Proceedings
ISSN (Print)1095-323X


ConferenceIEEE Aerospace Conference
Country/TerritoryUnited States
CityBig Sky
Internet address


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