Master thesis work at Antenna Electrical Design
Do you want to be involved in developing the future technology? Space is a part of the daily work at RUAG Space. We manufacture space products that are used in almost all satellites and rockets serving the world wide space industry and global needs.
At RUAG Space we work in teams and have close collaboration in projects. We care about the balance between work and leisure through our flexible working conditions.
We are located i Göteborg and Linköping. RUAG Space AB is a part of the space division within RUAG Holding AG, a swiss technology group. The space division has approx. 1 100 employees in Switzerland, Sweden and Austria.
Verification and Calibration of Antenna Test Range
Requirements on antennas for space use are very stringent and measurement methods need to be continuously refined to be able to accurately verify them. The antenna radiating properties (radiation pattern, gain, cross-polarization &c.) are tested on an antenna test range. The ranges can be of indoor (anechoic chamber) or outdoor (free space or ground reflection) types. The RUAG Space “A6” anechoic chamber is an anechoic indoor chamber primarily used for frequencies between 0.8 and 40 GHz. The room size is 5 m x 5 m x 9 m, with a probe to AUT (antenna under test) distance of 6 m.
To maintain a high level of accuracy in antenna measurements, range equipment thus needs verification and calibration. This is normally done on a yearly basis and normally per individual test instruments. We have chosen a slightly different method where the complete range is calibrated and verified as one complete unit. The method is based on a “first” reference test that is compared to every new calibration and verification done. By doing this we avoid to tear down the range and take out individual test equipment. The yearly calibration is today performed by an external service entity. The method is, today, somewhat manual by its nature, and we want to expand it further. It is also desirable to add functionality for positioner diagnostic as well as alignment verification.
There is also a need for characterization of the range RF path to be used as the reference for the above. Together with this characterization a routine for link budget optimization is needed to get the best possible dynamic range for different frequency bands.
We have also, no good means or methods to use for fault finding, maintenance or service of the range. This is needed to be able to identify problematic units and also to establish if a test result is due to a range fault or emanating from the AUT. Thus a diagnostic method including software to fault-find and verify functionality is needed.
The project goal should be to establish a method of how to verify and calibrate our range, establish the best dynamic range and to be able to do fault finding and functional checks.
The project should comprise:
- A literature study (e.g. antenna measurement ranges, calibration methods, standards and instrumentation)
- Antenna measurement and instrumentation theory
- Define and compile requirements for the wanted steps and method/s
- Establish range data e.g. the range link budgets, dynamic range and error budgets
- Define methods for calibration, verification, dynamic range testing and fault finding
- Define and establish the needed software for the above
- Document the method and software
- Perform practical tests for calibration, verification, dynamic range and fault finding
- Conclusions and recommendations
The work should be a master thesis of 30 credits and the duration is 20 weeks for one student. The starting time should be as soon as possible in agreement with the student. Understanding of electromagnetic fields and antennas is strongly recommended. Relevant education is engineering, majoring in microwave technology, antennas or technical computations.
For more information about the thesis work contact:
Johan Wettergren, tel: 031-7354034, johan.wettergren(at)ruag.com