Terahertz Kommunikationssysteme

Simulation, Aufbau und Charakterisierung ultra-breitbandiger drahtloser THz-Kommunikationssysteme

Offene studentische Arbeiten

Multiple topics available in the satellite project (EIVE) and outdoor, terrestrial transmission to validate the atmospheric effects and characterize the RF E-Band link and modules (EIVE-T project).

Working language: German and/or English.

The options are very diverse, e.g.

  • Circuit design (design and layout the prototype PCBs)
    • DC supply with voltage and current monitoring
    • Adaptive analog lowpass filter design
  • System analysis
    • data processing to analyze the transmission quality, losses and impairment effects
    • influence of the elevation angle on the different transmission parameters, for different modulations and polarizations
  • Automation by means of integrated microcontrollers
    • control the transmission
    • adapt to the ambient effects (internal temperature of the antenna housing) as well as the atmospheric effects
    • monitor sensors (temperature, pressure, humidity)
    •  design of a rudimentary interface for digital control
  • Visualization
    • collect, process and visualize the data
    • quantify the transmission effects and results.
  • FPGA Testing, Verification and implementation of RadHard design.

For details, questions and interests please send an "initiative application" email to the project responsible/ contact person, specifying your interests, experience and expectations.

Contact

Please refer to the PDF for more details as well as to the above mentioned projects websites.

Motivation:

For a existing wideband Phase Locked Loop (PLL)  as part of a carrier recovery, an external, controllable loop filter (LF) must be designed.
It´s application will be in a satellite-groundstation of the EIVE Project, in which it locks on the carrier of an E-band (ca. 75GHz) QPSK-modulated, wideband data
signal. The application only allows fast analog loop filter in the direct path, because
of very small time delay necessary. For accurate tracking of e.g. doppler shift of the moving satellite, temperature shifts etc. an additional, overlaying digitally implemented filter must be developed.

Goals:

- Development of a controllable LF as a mixed signal system (fast analog signal
throughput via OP-Amp, digital implementation (e.g. µ-Controller/
controllable OP-Amp etc.) of slower tracking capability (integration).
- Evaluation of correlation between filter parameters and locking behavior (lock
range, pull in range, stability etc.) of the PLL / carrier recovery.
- Verification of the latter with a functioning prototype of the analog PLL
and the LF.

Tasks:

- Evaluation of required specs for a LF
- Design and simulation of a mixed signal LF
- Design and layout of a prototype PCB
- Design of a rudimentary interface for digital control
- Design of a testbench and debugging of interface

 

Contact

Please refer to the PDF for more details.

PDF

Motivation:

Nichtidealitäten elektronischer Schaltungs-komponenten analoger Tx- / Rx-Frontends limitieren signifikant die maximale Übertragungskapazität. Um applikationsspezifisch bereits beim Systementwurf die passenden Schaltungstopologien und Link-Architekturen wählen zu können, ist ein detailliertes Verständnis der Zusammenhänge zwischen Komponenten- und Systemperformance erforderlich.  

Ziele:

- Verknüpfung einzelner Nichtidealitäten auf Komponentenebene mit der Leistungsfähigkeit des Gesamtsystems
- Sensitivitätsanalyse verschiedener Link-Architekturen / Schaltungstopologien

Aufgaben:

- Evaluierung vorhandener Entwürfe
- Entwicklung neuer Konzepte
- Circuit-level Simulationen mit ADS
- 3D Feld-Simulationen mit CST/Momentum
- MMIC Layout mit Cadence
- Literaturrecherche

Kontakt

PDF

Motivation:

3D-Druckverfahren ermöglichen im Bereich des Prototypenentwurfs kurze Entwicklungszyklen. Durch die steigende Fertigungspräzision und die Möglichkeit der Verwenung elektrisch leitfähiger Filamente ergeben sich auch im Bereich drahtloser Kommunikationssysteme interessante Anwendungsmöglichkeiten für 3D-Druck.

Ziel:

Implementierung und Charakterisierung einer 3D-gedruckten Antenne für drahtlose Kommunikationssysteme

Aufgaben:

- Vergleich herkömmlicher und 3D-gedruckter Antennen im Bezug auf ihre charakteristischen Parameter
- Entwurf, Simulation und Fertigung einer (Horn-)Antenne im X-Band und/oder E-Band
- Vergleich verschiedener Realisierungsmöglichkeiten der elektrisch leitfähigen Oberfläche der Antenne
(leitfähiges Filament vs. prozessiertes PLA Filament)
- Literaturrecherche
- Vermessung der Antennen im Labor

Kontakt

PDF

Motivation:

The stability of terahertz analog circuits is highly dependent on the quality of the DC supply. MMICs usually require several different DC levels for operation, which must maintain certain ramp-up and ramp-down sequences to avoid damaging the analog circuits. Further, to generate measurements over different operating points, DC voltages must be swept. Measurement automation ensures repeatability and high quality of performed measurements.

Goals:

For the lab power supply of analog integrated circuits Keysight and National Instrument SMUs are used. An interface should be developed to connect the SMUs within an existing environment for measurement automation in MATLAB.

Your Tasks:

  • Programming and debugging of a custom software interface / driver library in MATLAB
  • Provision of ramp-up and ramp-down sequences
  • Validation
  • Documentation and creation of user manual
  •  

Others:

Form, scope and reimbursement of the student assistant position will be arranged in consultation with the supervisors.

Please refer to PDF for more information.

Contact

 

PDF

Dieses Bild zeigt Benjamin Schoch

Benjamin Schoch

M.Sc.

Wissenschaftlicher Mitarbeiter

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