Nach positiver Absolvierung der Lehrveranstaltung sind Studierende in der Lage...

After successful completion of the course, students have a deeper understanding of RF circuits and systems. They will learn about substrates, transmission lines on PCBs, differential transmission lines, and even and odd modes. Students will learn how to perform advanced vector network analyser (VNA) measurements, such as pulsed and mixed mode S-parameters, both theoretically and in hands-on measurements in the lab. This includes corresponding calibration techniques, like unknown thru, adapter removal, power calibration among others. Students will learn about signal integrity issues, which can be analysed using time domain reflectometry (TDR). Again students will learn the theory and will get hands-on experience by performing measurements in the lab.

Students will learn how to design a typical RF circuit on the example of a band-pass filter. This starts by performing necessary calculations based on the filter theory, simulation in an RF simulation environment, manufacturing a prototype and measuring the performance. This will include an introduction on a state-of-the-art microwave simulation tool.

Lecture

Lecture: Circuit Design - Microwave Transmission Lines and Substrates (1 unit)

• transmission lines on PCBs: microstrip, coplanar, substrate integrated waveguide
• differential transmission lines: even/odd modes, impedance definition
• microwave substrates

Lecture: Circuit Design - Microwave Connectors (1 unit)

• common connector types and families
• maximum ratings
• mode conversion and parasitics
• connector care

Lecture: Circuit Design - Microwave Components (2 unit)

• typical RF devices overview
• distributed passive elements: hybrids, couplers, stubs
• lumped passive elements: parastitic elements, self resonance, models
• active lumped elements: PIN-diode, varactor, FET
• building switches and attenuators from PIN-diodes
• power devices: impedance/thermal issues

Lecture: Measurement - Vector Network Analyzer (3 units)

• limits of scalar calibration
• VNA error models
• response, one-port, and enhanced response calibration
• calibration beyond SOLT (short open load thru):
  • sliding load
  • adapter removal, unknown-thru, TRL
  • electronic vs. mechanical
  • power calibration, power measurements
  • mixed-mode S-parameters
  • block diagram and features of a modern VNA
  • reconfiguring the VNA:
    • high power, high gain, high dynamic range
    • pulsed measurements

Lecture: Measurement - Spectrum Analyzer (2 units)

• block diagram and features of a modern SA
• narrowband vs. broadband measurements
• detector modes
• swept vs. real-time measurements
• maximizing the dynamic range

Lecture: Measurement - Signal Integrity (1 unit)

• signal integrity parameters
• TDR
• eye diagram

Lecture: Measurement - Power Measurements (1 unit)

• method of measuring power
• power meters
• common pitfalls

If only a small number of students attends the course, the course's program is subject to change.

Laboratory/hands-on (independent preparation & 2-3 afternoons in the lab)

The lab course is be held during the term accompanying the oral lectures. Each student will receive a personalized filter problem (filter type, frequency, bandwidth) and has to design/simulate the filter on his own. This is done with the microwave design tool "AWR Microwave Office". Students enrolling this course will receive a full license (time limited) of the design tool, allowing them to prepare the filter on their own PC. This part is structured as follows:

• introduction into "AWR Microwave Office" (1 hour, by supervisor)
• design of the filter with ideal lumped elements (by student at home)
• transformation into distributed elements (by student at home)
• consideration of parasitic effects by distributed element models (by student at home)
• optimization of the filter (by student at home)
• introduction into EM analysis (1 hour, by supervisor)
• EM-analysis and optimization (prepared by student at home, finished during lab course)
• production of the filter by a rapid-prototyping PCB-mill (during lab-course, by supervisor)
• measurement and comparison (during lab course)

The total amount of time for this part (supervised & non-supervised & lab) is around 30 hours. Students will be asked to hand in a report of their filter-design.

The lecture is split into three parts: oral presentations, two lab exercises, and a circuit design part.

Kick off meeting: October 10th, 2019; 02.00 p.m.
Location:Seminar room E354, Room No. CF 0153 (together with kick off meeting of "Seminar RF techniques")

The lecture will be given in 11 units (45min + 45min) on a weekly schedule. The day of the week and time will be fixed during the kick off meeting. If only a small number of students attends the course, the course's program is subject to change. The laboratory/hands-on part will be held accompanying the oral lectures and will start after the last lecture on circuit design.

The grading of the lecture will be composed as follows:

• 60% oral exam of the lecture part
• 20% participation on the lab exercises
• 20% report on the circuit design part

Successful completion of "RF Techniques" (course and lab) or equivalent knowledge is required.
If "RF Techniques" has not been completed, your equivalent knowledge will be checked by a short examination before the beginning of the course. The main topics addressed are:

• Fundamentals of electrical engineering and circuit design.
• Basic knowledge about linear RF-circuits, scattering matrix, Smith-chart
• Operation of vector network analyzer, spectrum analyzer, power meter