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Logo: Institute of Microwave and Wireless Systems
Logo Leibniz Universität Hannover
Logo: Institute of Microwave and Wireless Systems
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Lab: Radiofrequency Measurement Technique I

Modern transmitters and receivers are made up of many basic building blocks, e.g. Modulators or demodulators, oscillators, phased locked loops, operational amplifiers, filters, amplifiers, transistor mixers or antennas. Each component has a decisive role in the overall system. Therefore, engineers have to have a good knowledge of these components and this will be transmitted to the students in the laboratories of high-frequency technology.

Students learn the theoretical foundations of a range of high-frequency systems. They deepen their knowledge on the basis of practical investigations and measurements on experimental setups. The students document their examinations in written protocols and are able to evaluate the results obtained qualitatively.

Experiment 1 - Radio Frequency Identification

  • Basic functional principle
  • Measurement of system characteristic parameters

Experiment 2 - Operational Amplifiers

Breadboard assembly and measurements on an

  • Amplifier
  • Adder; Substractor
  • Electrometer amplifier
  • Integrator; Differentiator
  • Logarithmizer

Experiment 3 - Feedback

  • Examination of voltage-/current serial and parallel feedback on a transistor amplifier

Experiment 4 - Amplitude Modulation

Examination of different modulation methods

  • Conduction angle control
  • Collector voltage modulation
  • Slope control
  • Analysis of different modulators
  • Envelope detector
  • Coherent demodulation
  • Determination of modulation characteristics

Experiment 5 - Angle Modulation

  • Disturbance response of the FM-transmission
  • Demodulation of RF-signals
  • Fundamentals of the generation of frequency-modulated oscillations

Experiment 6 - Digital Modulation Methods

  • Stability of the methods
  • Examination of pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM)

Experiment 7 - Spectrum Analysis

  • Sources of errors and limits of spectrum analysis
  • Basics, functionality and correct handling of a spectrum analyzer for high-frequency electrical signals

Experiment 8 – Components of a transmitter and receiver system

  • Component functionality of transmitters and receivers: Filter, mixer, amplifier, …
  • Fundamentals of wireless data transmission