Höchstfrequenzeletronik auf Graphene-Basis
Graphene is a 2-D material with outstanding electrical and mechanical properties. The reported carrier electron mobility and saturation velocity, together with the ability to large-scale integration on different substrates make graphene a perfect candidate for RF, millimeter-wave, and submillimeter wave circuit applications such as Internet of Things, near-field communications, radio frequency identification device (RFID) tags, flexible electronics, smart wearables, medical, and communications applications.
Accordingly, Graphene-based devices and circuits are under continuous development to make use of these unique properties. However, due to process immaturity, the reported graphene field-effect transistor (GFET) based circuits suffer from lower cutoff frequency (fT) and lower maximum oscillation frequency (fmax) than what could be expected based on the high carrier transport properties. In that regard, we designed non-conventional circuits to make use of the Graphene properties directly by designing sixport receivers using the Graphene FETs as power detectors on different substrates and for different frequency ranges up to 110GHz. In addition, we developed a new diode device based on the Metal-Insulator-Metal diode structure. Replacing one metal electrode by Graphene provides much higher nonlinearity and outstanding frequency characteristics. The novel device properties have been used to design different circuits such as power detectors, mixers, varactos, etc. We're continuing our research to explore novel transistors structures and to improve our diode device.
Graphene activities done by HFE
- Graphene-based MMIC backend development
- Graphene enabled thin-film devices on rigid and flexible substrates
- Graphene enabled thin-film Circuits on rigid and flexible substrates
- Micro/millimetre-wave Power detectors
- Micro/millimetre-wave Mixers
- Micro/millimetre-wave frequency multipliers
- Micro/millimetre-wave receivers
- Micro/millimetre-wave modulators
- Boolean logic gates and memory
Live WiFi video transmission using graphene devices
Graphene Flagship Pavilion MWC 2018Urheberrecht: HFE
Prof. Negra im Gespräch mit dem EU Commissioner und Jari Kinaret, dem Koordinator des EU Graphene-Flagships.
Bereits zum 2. Mal war der Lehrstuhl für Höchstfrequenzelektronik auf dem Graphene Flagship Pavilion am Mobile World Congress (MWC) 2018 in Barcelona. Vom 26.2. - 1.3.2018 präsentierten wir dort die neuesten Forschungsergebnisse bezüglich "Flexible Graphene-based Circuits for wireless applications".
- W-band Graphene-Based Six-port Receiver (pdf: 1065 kb)
- Zero-Bias 50-dB Dynamic Range Linear-in-dB V-Band Power Detector Based on CVD Graphene Diode on Glass (pdf: 6854 kb)
- Graphene integrated circuits: new prospects towards receivers realisation (pdf: 4914 kb)
- Millimeter-wave graphene-based varactor for flexible electronics (pdf: 1962 kb)
- Zero-bias, 50 dB Dynamic Range, V-Band power detector based on CVD graphene-on-glass (pdf: 2775 kb)
- High Performance Metal-Insulator-Graphene Diodes for Radio Frequency Power Detection Application (pdf: 2061 kb)
- Graphene-based rectifier circuit
- Fabrication and characterization of metal-insulator-graphene diodes for microwave and THz application (pdf: 268 kb)
- A Graphene-based quantum capacitance varactor for millimeter-Wave applications (pdf: 255 kb)
- Millimeter-wave, Graphene-based power detector (pdf: 538 kb)