LRF – Radio Frequency Laboratory
  • Best paper award (3rd place) in SBCCI 2015

    Publicado em 15/09/2015 às 11:28 PM

      The paper “A 25-dBm 1-GHz Power Amplifier Integrated in CMOS 180nm

    for Wireless Power Transferring“was awarded as the  third best paper of the

    28th Symposium on Integrated Circuits and Systems Design. (slides here)

    Captura de tela de 2015-11-09 23:05:02

  • Lecture: Computational Intelligence for Motion Analysis: A Sensor Fusion Perspective

    Publicado em 15/09/2015 às 11:05 AM

    Thanks Dr. Brum



    The Technical Chapter IEEE-IMS / CAS / COMMSOC (Florianópolis / South) invites you to the lecture Computational Intelligence for Motion Analysis: A Sensor Fusion Perspective by Dr. Carolina Brum Medeiros.


    • Date: 16th September, 2015
    • Time: 10:00 am.
    • Local: Auditorium of the Electrical Engineering Department of Federal University of Santa Catarina (Teixerão), Florianópolis-SC.

    Download Lecture details.


  • Lecture: Unobtrusive Smart Sensing and Pervasive Computing for Healthcare

    Publicado em 02/08/2015 às 10:05 PM


    Thanks Prof. Postolache!



    The Technical Chapter IEEE-IMS / CAS / COMMSOC (Florianópolis / South) invites you to the lecture Unobtrusive Smart Sensing and Pervasive Computing for Healthcare by Prof. Octavian Postolache, in the framework of the Distinguished Lecturer Program of the IEEE Instrumentation and Measurement Society.


    • Date: 07th August, 2015
    • Time: 10h00
    • Local: Auditorium of the Electrical Engineering Department of Federal University of Santa Catarina, Florianópolis-SC.

    Download Lecture details.


  • WBAN presentation at CEFET-MG

    Publicado em 21/07/2015 às 02:26 PM


      wban Professor Fernando Rangel presented the research activities conducted at UFSC Radiofrequency Lab for students and researchers of CEFET-MG. (slides here)

  • Proposta de TCC 2015/2

    Publicado em 10/07/2015 às 09:05 AM


    BannerLRF_TCC2015-2 As diferentes tecnologias voltadas à instrumentação na área de petróleo e gás estão em ascensão. Aplicações baseadas em circuitos de RF e sensores eletromagnéticos são o foco desta proposta, que visa a elaboração de soluções práticas e de baixo custo para solucionar os diferentes problemas encontrados na indústria.O trabalho deverá ser realizado com o auxílio de uma ferramenta profissional de simulação eletromagnética e de CFD no Laboratório de Radiofrequência em parceria com o Laboratório Experimental de Escoamentos Multifásicos da UFSC.Para maiores informações: /

    Baixar proposta em pdf



  • Master Thesis defense: Ronaldo Martins da Ponte

    Publicado em 20/02/2015 às 03:18 PM

    The MSc. candidate Ronaldo Martins da Ponte successfully defended his thesis, in which he proposed an ultra-low power circuit integrated circuit to condition an ISFET sensor.

  • Published in Electronics Letters

    Publicado em 23/12/2014 às 06:00 AM




    DOI:  10.1049/el.2014.3800 

  • Published in Journal of Analog Integrated Circuits and Signal Processing

    Publicado em 23/12/2014 às 12:00 AM

    srg_paperDOI: 10.1007/s10470-014-0473-z


  • Published in Journal of Integrated Circuits and Systems

    Publicado em 22/12/2014 às 12:21 AM


  • 2014 Dinner

    Publicado em 20/12/2014 às 05:57 PM


  • Final Year Project on Metamaterial-Inspired Sensors

    Publicado em 09/12/2014 às 11:20 PM


    Renato Feitoza presented his Final Year Project on Metamaterial-Inspired Sensors entitled: “ Design of miniaturized antennas based on metamaterials for passive sensing applied to internet of things (IoT) “. (pdf)

  • Final Year project on Low Voltage/Low Power oscillator

    Publicado em 06/12/2014 às 09:31 PM

    Last Friday, Rodrigo Rottava presented his Final Year Project on Low Voltage/Low Power oscillators entitled:  Analysis and Design of a Colpitts Oscillator with Double Positive Feedback Operating in High Frequency and LowVoltage/Low Power. (Slides here)


  • Our team by february 2014

    Publicado em 04/09/2014 às 11:40 AM

    These people are very proud of being THE RF RESEARCH GROUP at UFSC.

  • Circuits and Systems for WBAN – Talk at NUTES

    Publicado em 04/09/2014 às 11:38 AM
             Fernando_NUTES   The GRF/LRF work on WBAN was the subject of a talk by Prof. Rangel at NUTES (Núcleo de Tecnologias Estratégicas em Saúde).

        On occasion, the GRF researcher presented an overview of WBAN research being conducted by the Research Group on Radio Frequency at UFSC, with emphasis on: a) the transmission of wireless power for miniaturized implants; b) Characterisation of the human body communication channel; c) integrated temperature sensor powered by RF; d) energy harvesting body temperature.


    GRF  believes that  WBAN is the way for innovation in the next 25 years, however, to be successful the WBAN should consume low power and should operate without bulky batteries, so that they can be used or implanted, which are some of the challenges for circuit and system designers.




  • Available positions !

    Publicado em 09/07/2014 às 07:05 PM

    We are offering two opportunities for research assistants in undergraduate level (BOLSA DE INICIAÇÃO CIENTÍFICA).  The selected candidates will do  research on the following subjects:

    1. Energy Harvesting
    2. RFIC built-in selft-test and self-repair
    3. RF instrumentation and measurement

    Context: Ultra low power devices for Wireless Body Area Networks (WBAN). For medical applications the consumption

    is the most critical design parameter, especially in implanted devices where it is inconvenient or impossible to replace the
    battery. Therefore, we try to employ solutions such as: battery recharging via energy transfer or magnetic coupling, harvest of available energy in the environment.

    PIBIC Requirements.

    • Full time undergraduate student (without other grant or work) whit interest in developing research activities (20 hours per week).
    •  IA (IAA) more than 7.
    •  Have done at least one course of electrical circuits.
    •  Skills which are relevant:
    1. Independence: being able to work without close supervision, managing your own time and projects.
    2. Critical thinking: being able to evaluate your work and that of others, making judgments about the value of information and drawing conclusions from data.
    3. Problem solving: working without “a right answer” and devising strategies to work towards a solution.
    4. Contributing as a professional: presenting work to your peers, managing discussions and defending your position, having the confidence to put forwards ideas to senior staff.
    5. Initiative: having the confidence to make decisions and act on them, not waiting for approval to do basic tasks, but reporting back responsibly at appropriate times.

    Some PIBIC Benefits

    • Favorable framework to develop research abilities such as: research methods, problem solving, argument construction, preparation and prioritization, and time management.
    • The “Ciência sem fronteiras” program prefers the candidates who have been enrolled in some scientific initiation program.
    • Grant for twelve (12) months beginning on August (2014).

    What to do?

    You must send email with your resume (showing your skills, experience, and achievements) to schedule an appointment for the personal interview, before 22 july.
    These interviews will be on 24 and 25 july (2014).

    Contact :
    Arturo Fajardo.
    Paulo Marcio Moreira.

    Or, send us a message using the form found here.


  • Workshop on RF and mmW

    Publicado em 04/04/2014 às 01:59 PM


  • SBCCI 2013 Best Paper Award!

    Publicado em 11/09/2013 às 02:06 AM

    The paper “An RF-Powered Temperature Sensor Designed for Biomedical Applications” by Gustavo Campos Martins and Fernando Rangel de Sousa won the SBCCI 2013 Best Paper Award!

  • Master Thesis Defense

    Publicado em 22/08/2013 às 12:44 PM

    Gustavo Campos defended his master thesis intitled: “RF-Powered CMOS Temperature Sensor“. His work presents the development of a wirelessly powered CMOS temperature sensor, designed to measure temperatures in the human body temperature range. The sensor receives energy through an RF signal emmited by a reader device. Once the sensor has enough energy, it sends data about the measured temperature to the reader. The system was designed to operate with signal levels as low as −10dBm centered at 900MHz. The sensor device is formed by the following circuits: rectifier, voltage limiter, reference source, operating mode selector, voltage regulator, oscillator and backscattering device. The system presented 8.5μA current comsumption in active mode and 4.9μA in standby mode. The developed sensor contains a calibration method, which was designed to achieve maximum temperature measurement error of 0.2 C.

  • Harvester Prototype

    Publicado em 11/08/2013 às 12:10 AM

    Our integrated RF harvester for WBAN sensors was tested in a chip-on-board prototype. It is going to be used in a body temperature sensor.

  • Highly miniaturized ZOR antenna (Presented at IEEE/IMOC 2013)

    Publicado em 10/08/2013 às 12:38 AM

    Miniaturization is a primary concern today in communication
    and biomedical systems. A highly miniaturized antenna
    with electrical length 0.036λ  x 0.044λ x 0.005λ
    (11.25mm×13.80mm×1.55mm) was implemented based on
    the zeroth-order resonance approach. The experimental resonance
    frequency presented a slight shift to the right due to the
    limited resolution of the fabrication process. The detailing of
    the design methodology presented here can be a useful guide to
    antenna designers who are working on miniaturized antennas.


  • In China: paper about low-power oscillator was presented at ISCAS 2013

    Publicado em 30/05/2013 às 02:16 AM

    Our work on low-power oscillator was presented at ISCAS2013 in Beijing-China. We presented a technique to improve the negative conductance of amplifiers in order to decrease the power consumption of single-transistor  CMOS oscillators.


  • SIM2013 Best paper award

    Publicado em 04/05/2013 às 02:15 AM

    Mateus Bernardino, MSc. student at GRF,  won the SIM 2013 best paper award  with the work  “A 2.4 GHz Fully-Integrated CMOS Class-AB Power Amplifier“.

  • 900 MHz RF Harvesting successfully tested!

    Publicado em 29/11/2012 às 05:19 PM

    We achieved an important milestone of our WBAN roadmap. The UHF energy harvesting designed to power on-body sensors was tested and worked as expected!

  • New IC under test!

    Publicado em 14/11/2012 às 01:24 PM

    We received new chips containing our last designs. The circuits are under test in the laboratory!

  • Master’s thesis defense

    Publicado em 19/10/2012 às 11:00 PM

         Today, the graduate student Roddy Romero defended his master’s thesis entitled “Duty-Cycle Controlled Variable-Gain”.