scholarly journals Analysis of microstrip-to-circular-waveguide transitions by a new spatial-images method

2005 ◽  
Vol 45 (6) ◽  
pp. 563-568 ◽  
Author(s):  
F. D. Quesada Pereira ◽  
P. Vera Castejón ◽  
J. L. Gómez Tornero ◽  
D. Cañete Rebenaque ◽  
J. Pascual García ◽  
...  
Keyword(s):  
Circular Waveguide ◽  
Waveguide Transitions

scholarly journals Analysis of Microstrip to Circular Waveguide Transitions by a New Spatial Images Method

2005 ◽  
Author(s):  
F.D. Quesada Pereira ◽  
P. Vera Castejon ◽  
D.C. Rebenaque ◽  
J. Pascual Garcia ◽  
J.L. Gomez Tornero ◽  
...  
Keyword(s):  
Circular Waveguide ◽  
Waveguide Transitions

scholarly journals Compact mode-matched excitation structures for radar distance measurements in overmoded circular waveguides

2008 ◽  
Vol 6 ◽  
pp. 9-17 ◽  
Author(s):  
G. Armbrecht ◽  
E. Denicke ◽  
I. Rolfes ◽  
N. Pohl ◽  
T. Musch ◽  
...  
Keyword(s):  
Circular Waveguide ◽  
Design Criterion ◽  
Distance Measurements ◽  
Mode Suppression ◽  
Spurious Mode ◽  
Propagation Effects ◽  
Circular Waveguides ◽  
Radar Measurements ◽  
Waveguide Transitions ◽  
Waveguide Taper

Abstract. 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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