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Ricardo Figueiredo received the integrated M.Sc. in Electronics and Telecommunications Engineering (2018) and the Ph.D. in Electrical Engineering (2023) from the University of Aveiro, Portugal. He is currently an Auxiliary Researcher at Instituto de Telecomunicações (IT), Aveiro, where his work focuses on RF measurement science, operational spectrum sensing, and system-level characterization of complex electromagnetic environments. His research centers on experimentally grounded methodologies for RF system characterization and sensing under realistic operating conditions, bridging theoretical modeling with deployment-driven experimentation. His contributions span nonlinear RF system characterization, wideband measurement frameworks, and operational RF sensing methodologies for communications, space, and defense applications. His work has advanced measurement approaches for broadband systems, enabled realistic performance evaluation using communication signals, and contributed to emerging methodologies for RF spectrum awareness and interference analysis. In recent years, his research has expanded toward operational RF sensing in complex environments, including experimental campaigns conducted within NATO STO IST-SET-204 activities on passive RF detection and large-scale measurement efforts such as Aveiro Defense Week. These activities have supported the development of measurement frameworks, datasets, and experimental methodologies for UAV detection and classification in interference-rich scenarios. His work also includes mission-driven RF experimentation under ESA initiatives, contributing to spectrum coexistence studies and space-oriented sensing applications. Beyond scientific contributions, Ricardo Figueiredo has coordinated multidisciplinary experimental activities involving academia, industry, and defense stakeholders, with responsibilities spanning experimental design, instrumentation deployment, data infrastructure development, and system-level validation. His work integrates methodological development, implementation, and operational evaluation, supporting both scientific advancement and practical capability development in RF sensing and measurement.
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Identification

Personal identification

Full name
Ricardo José Coelho de Figueiredo

Citation names

  • Figueiredo, Ricardo

Author identifiers

Ciência ID
6E15-2927-46AF
ORCID iD
0000-0001-7252-7467

Email addresses

  • ricardofigueiredo@av.it.pt (Professional)

Knowledge fields

  • Engineering and Technology - Electrotechnical Engineering, Electronics and Informatics - Telecommunications

Languages

Language Speaking Reading Writing Listening Peer-review
Portuguese Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1)
English Upper intermediate (B2) Upper intermediate (B2) Intermediate (B1) Upper intermediate (B2) Upper intermediate (B2)
Spanish; Castilian Intermediate (B1) Elementary (A2) Elementary (A2) Intermediate (B1) Elementary (A2)
Education
Degree Classification
2018 - 2023
Concluded
 Programa Doutoral em Engenharia Electrotécnica (Doutoramento)
Universidade de Aveiro, Portugal
"Linearity Metrics and Characterization Techniques for Nonlinear Dynamic RF Systems" (THESIS/DISSERTATION)
2013 - 2018
Concluded
 Mestrado Integrado Em Engenharia Electrónica e Telecomunicações (Mestrado integrado)
Universidade de Aveiro, Portugal
"Caracterização de Agregados de Antenas Não-Lineares para Aplicações 5G" (THESIS/DISSERTATION)
 17
Affiliation

Science

Category
Host institution		 Employer
2023/07/01 - Current Auxiliary Researcher (Research) Instituto de Telecomunicações Campus Universitário de Santiago, Portugal
Projects

Grant

Designation Funders
2018/12/17 - 2019/09/01 INFANTE (MOBILIZADOR)
POCI-01-0247-FEDER-024534
Master Student Fellow
Ongoing
2016/06/01 - 2018/05/31 ESTRATÉGICO - 2015
UID/EEA/50008/2013
Scientific Initiation Fellow
Instituto de Telecomunicações Campus Universitário de Santiago, Portugal
Concluded

Contract

Designation Funders
2023/07/01 - Current NEWSPACE
02/C05-i01.01/2022.PC644936537-00000046
Research Fellow
Ongoing
2024/02/02 - 2025/02/08 Interference Identification and Mitigation in SBSP
I-2023-07422
Co-Principal Investigator (Co-PI)
Instituto de Telecomunicações Campus Universitário de Santiago, Portugal
 European Space Agency
Concluded
2023/06/01 - 2024/12/31 Tiled Energy Focus with Solar Concentrators
4000136442
Researcher
Concluded
2018/09/01 - 2019/09/11 GANDALF
ESA ITT AO/1-9088/17/NL/HK
Researcher
Ongoing
Outputs

Publications

Conference paper
  1. Santos, André; Carvalho, Nuno Borges; Figueiredo, Ricardo; Cowley, Aidan. "Coexistence Challenges: Analyzing SBSP-Induced Interference in Terrestrial Communication Systems". 2025.
    10.1109/wptce62521.2025.11062096
  2. Santos, Samuel; Navarro, Antonio; Figueiredo, Ricardo; Violas, Manuel; Carvalho, Nuno. "Efficiency Improvement in a Class F Power Amplifier Using a Square Wave Signal at 1 GHz". 2025.
    10.1109/icct-europe63283.2025.11157674
  3. Navarro, Antonio; Pereira, Emanuel; Figueiredo, Ricardo; Oliveira, Arnaldo; Carvalho, Nuno Borges. "A Comparative Study Between Direct Coupled Waveguide and Combline Cavity Filters at 30 GHz". 2025.
    10.1109/icct-europe63283.2025.11157692
  4. Figueiredo, Ricardo; Carvalho, Nuno Borges. "NPR Assessment Without Multi-Tone Phase Randomization". 2023.
    10.1109/arftg57476.2023.10278734
  5. Pereira, Ricardo A. M.; Matos, Diogo; Figueiredo, Ricardo; Mendes, Bernardo; Chaves, Henrique; Ribeiro, Helena; Costa, Helder; et al. "Quasioptical Double-Lens Wireless Power Transfer System with Patch Array Antennas". 2023.
    10.1109/wptce56855.2023.10215639
  6. Figueiredo, Ricardo; Carvalho, Nuno. "Linearity Metrics and Signal Statistics - The Need for Standards". 2022.
    10.1109/ims37962.2022.9865648
  7. "Two-Tone Signals Harmonic Conditions for PAPR Variation". 2022.
    10.1109/inmmic54248.2022.9762178
  8. "Issues of Multi-Notch NPR Characterization Procedures". 2021.
    10.1109/arftg52261.2021.9639973
  9. "Barium Strontium Titanate Thick Films for Tunable Software-Defined Radio Front-Ends". 2021.
    10.1109/ims19712.2021.9574935
  10. Figueiredo, Ricardo. "Swept Notch NPR for Linearity Assessment of Systems Presenting Long-Term Memory Effects". 2020.
    10.1109/ARFTG47271.2020.9241380
  11. Figueiredo, Ricardo. "Co-Channel Radiation Pattern Distortion in Transmitting 5G Antenna Arrays due to 3rd Order Intermodulation Products". 2019.
    10.23919/eumc.2019.8910766
  12. Figueiredo, Ricardo. "Modelling and Design methods for mmWave Phased Arrays". Paper presented in XII Iberian Meeting on Computational Eletromagnetics, Coimbra, 2018.
  13. Figueiredo, Ricardo. "Design of Narrow Band Single-Layer Chipless RFID Tag". 2018.
    10.23919/ursi-at-rasc.2018.8471475
  14. Figueiredo, Ricardo. "A Beginner’s survey of the technologies to solve 5G, understanding requirements for next generation wireless communications hardware". Paper presented in 11º Congresso do Comité Portugês da URSI ”Novas tecnologias para a mobilidade”, Lisboa, 2017.
  15. Figueiredo, Ricardo. "Sinusoidal WPT Signal Interferer, a Communications Approach". Paper presented in 32nd URSI GASS, Montreal, Montreal, 2017.
  16. Figueiredo, Ricardo. "Study of Interference Phenomenon Between WPT and WIFI 802.11a Signals". Paper presented in 10º Congresso do Comité Portugês da URSI ” Comunicações em cenários de segurança e emergência”, Lisboa, 2016.
Journal article
  1. Piacibello, Anna; Figueiredo, Ricardo; Quaglia, Roberto; Giofrè, Rocco; Colantonio, Paolo; Borges Carvalho, Nuno; Camarchia, Vittorio. "Design and Extensive NPR Characterization of a Highly Linear SatCom GaN MMIC Doherty PA". IEEE Transactions on Microwave Theory and Techniques 73 1 (2025): 156-166. https://doi.org/10.1109/tmtt.2024.3474092.
    10.1109/tmtt.2024.3474092
  2. Nuno Borges Carvalho. "High-Gain and High-Linearity MMIC GaN Doherty Power Amplifier With 3-GHz Bandwidth for Ka-Band Satellite Communications". IEEE Microwave and Wireless Technology Letters 34 6 (2024): 765-768. http://www.it.pt/Publications/PaperJournal/34269.
    10.1109/LMWT.2024.3384306
  3. Niotaki, Kyriaki; Carvalho, Nuno Borges; Georgiadis, Apostolos; Gu, Xiaoqiang; Hemour, Simon; Wu, Ke; Matos, Diogo; et al. "RF Energy Harvesting and Wireless Power Transfer for Energy Autonomous Wireless Devices and RFIDs". IEEE Journal of Microwaves 3 2 (2023): 763-782. http://dx.doi.org/10.1109/jmw.2023.3255581.
    10.1109/jmw.2023.3255581
  4. "Design and Characterization of Novel Barium Strontium Titanate Thick Films for Sub-6 GHz RF Applications". IEEE Transactions on Microwave Theory and Techniques 70 1 (2022): 611-621. http://dx.doi.org/10.1109/tmtt.2021.3125030.
    10.1109/tmtt.2021.3125030
  5. "Reconfigurable Three Functional Dimension Single and Dual-Band SDR Front-Ends Using Thin Film BST-Based Varactors". IEEE Access 10 (2022): 4125-4136. http://dx.doi.org/10.1109/access.2022.3140686.
    10.1109/access.2022.3140686
  6. "A 5-W GaN Doherty Amplifier for Ka-Band Satellite Downlink With 4-GHz Bandwidth and 17-dB NPR". IEEE Microwave and Wireless Components Letters (2022): 1-4. http://dx.doi.org/10.1109/lmwc.2022.3160227.
    10.1109/lmwc.2022.3160227
  7. "Nonlinear Dynamic RF System Characterization: Envelope Intermodulation Distortion Profiles—A Noise Power Ratio-Based Approach". IEEE Transactions on Microwave Theory and Techniques 69 9 (2021): 4256-4271. http://dx.doi.org/10.1109/tmtt.2021.3092398.
    10.1109/tmtt.2021.3092398
  8. Figueiredo, Ricardo. "Design of Narrow Band Single-Layer Chipless RFID Tag". URSI Radio Science Bulletin (2018):
    10.23919/URSIRSB.2018.8572497
Thesis / Dissertation
  1. Figueiredo, Ricardo. "Nonlinear Characterization of Antenna Arrays for 5G Applications". Master, 2018.
Activities

Oral presentation

Presentation title Event name
Host (Event location)
2025/03/07 Enabling the NewSpace Era Through RF System Innovation Rohde & Schwarz Seminar Tour
(Aveiro, Portugal)
2025/02 Atividades em Microeletrónica de Rádio Frequência Para o Espaço em Aveiro Aerospace Industry and Microelectronics
(Porto, Portugal)
2024/06 Implementation Challenges and Opportunities in Beyond-5G and 6G Communication 2024 IEEE MTT-S International Microwave Symposium
(Washington, United States)
2023/11 RF Electronics Challenges in THz Wireless Communications (6G): An Overview Rohde & Schwarz ThinkSix Seminar Tour
(Aveiro, Portugal)
2023/09/18 Replacing 3GPP signals by multi-tones: is it a bad idea? European Microwave Week
(Berlin, Germany)
2023/09 Multi-Tone Linearity Characterization Techniques Capable of Predicting Performance in Real Operation MOMA Workshop
2023/06/12 State-of-the- Art PA Design and Validation Requires a Signal Statistics Analysis and Proper Linearity Metrics IEEE MTT-S International Microwave Symposium
(San Diego, United States)
2016/09/15 Aquatic Drone for Environmental Metrology Techdays Aveiro

Supervision

Thesis Title
Role		 Degree Subject (Type)
Institution / Organization
2025 - Current Actuator Design for Space Surveillance and Tracking
Co-supervisor
2025 - Current Análise Inteligente de Dados de Ruído Electromagnético para Monitorização e Predição de Fenómenos Humanos e Ambientais
Co-supervisor
2025 - Current Desenvolvimento de um Sistema Híbrido de Microcolheita de Energia para Aplicações IoT Autossustentáveis
Co-supervisor
2025 - Current Ground Control to Major Tom
Co-supervisor
2025 - Current Spectral Digital Twins for Monitoring and Protection of Critical Infrastructures
Co-supervisor
2025 - Current Harmonic Tags
Co-supervisor
2023 - Current Interference Identification and Mitigation in SBSP
Co-supervisor
Universidade de Aveiro, Portugal

Event organisation

Event name
Type of event (Role)		 Institution / Organization
2025 - Current Aveiro Defense Week 2025 (2025)

Ad Hoc journal article review

Journal title (ISSN) Publisher
2025 - Current Communications Engineering
2024 - Current IEEE Transactions on Circuits and Systems I: Regular Papers
2024 - Current IEEE Microwave and Wireless Technology Letters
2024 - Current Scientific Reports
2022 - Current IEEE Transactions on Microwave Theory and Techniques
2019 - Current IEEE Access IEEE

Association member

Society Organization name Role
2019 - Current IEEE
2019 - Current IEEE MTT-S
2019 - Current IEEE Young Professionals

Committee member

Activity description
Role		 Institution / Organization
2025 - Current IEEE AP/ED/MTT-S Joint Chapter Portugal Chair
Coordinator
 IEEE Microwave Theory and Techniques Society, United States
2024 - Current URSI Commission A Early Career Representative
2024 - Current URSI Early Career Representative Editor
2021 - Current IEEE MTT-S TC-3 Affiliate Member

Conference scientific committee

Conference name Conference host
2026 - Current IEEE MTT-S International Microwave Symposium
2026 - Current XXXVIth URSI General Assembly and Scientific Symposium
2025 - Current International Conference on Consumer Technology-Europe 2025
2025 - Current IEEE Vehicular Networking Conference 2025
2025 - Current URSI Asia-Pacific Radio Science Conference 2025
2024 - Current IEEE MTT-S International Microwave Symposium
2024 - Current ATRASC 2024 4th URSI Atlantic Radio Science Meeting
2023 - Current 2023 IEEE Wireless Power Technologies Conference and Expo
2022 - Current IEEE MTT-S International Microwave Symposium

Course / Discipline taught

Academic session Degree Subject (Type) Institution / Organization
2026 - Current Propagação e Radiação de Ondas Eletromagnéticas (Licenciatura)
2025 - Current Propagação e Radiação de Ondas Eletromagnéticas (Licenciatura) Universidade de Aveiro, Portugal
2024 - Current Eletrotecnia Aplicada
2025 - 2026 Projeto de Engenharia Aeroespacial (Licenciatura)
2020/02 - 2020/07 Propagação e Radiação de Ondas Eletromagnéticas (Mestrado)

Mentoring / Tutoring

Topic Student name
2017/09 - 2018/07 University of Aveiro Mentor in the Tutoring Programme 7 university students
Distinctions

Award

2021 3rd place at 2021 IEEE MTT-S Microwave Week 3MT Competition
IEEE Microwave Theory and Techniques Society, United States

Title

2025 2025 IEEE MTT-S Outstanding YP Lecturer
IEEE Microwave Theory and Techniques Society, United States