Compact mode-matched excitation structures for radar distance measurements in overmoded circular waveguides
This contribution deals with guided radar level measurements of liquid materials in large metal tubes, so-called stilling wells, bypass or still pipes. In the RF domain these tubes function as overmoded circular waveguides and mode-matched excitation structures like waveguide tapers are needed to av...
| Published in: | Advances in Radio Science |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | German |
| Published: |
Copernicus Publications
2008-05-01
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| Online Access: | http://www.adv-radio-sci.net/6/9/2008/ars-6-9-2008.pdf |
| Summary: | This contribution deals with guided radar level measurements of liquid materials in large metal tubes, so-called stilling wells, bypass or still pipes. In the RF domain these tubes function as overmoded circular waveguides and mode-matched excitation structures like waveguide tapers are needed to avoid higher order waveguide modes. Especially for high-precision radar measurements the multimode propagation effects need to be minimized to achieve submillimeter accuracy. Therefore, a still pipe simulator is introduced with the purpose to fundamentally analyze the modal effects. Furthermore, a generalized design criterion is derived for the spurious mode suppression of compact circular waveguide transitions under the constraint of specified accuracy levels. According to the obtained results, a promising waveguide taper concept will finally be presented. |
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| ISSN: | 1684-9965 1684-9973 |