Measuring and testing – Liquid level or depth gauge
Reexamination Certificate
2007-01-23
2007-01-23
Nguyen, Hoang V. (Department: 2821)
Measuring and testing
Liquid level or depth gauge
C343S780000
Reexamination Certificate
active
10495412
ABSTRACT:
An antenna in a radar level gauge for determining the level of the surface of a medium stored in a tank. The antenna has a first and a second electrically conductive layer, and between the conductive layers a dielectric layer. The second of the conductive layers is provided with a number of holes in a predetermined pattern. Leading to the center of the dielectric layer is a transmission line. The microwaves from a radar unit in the radar level gauge are supplied to the dielectric layer in the antenna via the transmission line and transmitted out in a radial direction from a feed point in the dielectric layer that acts as a waveguide. Via said holes in the second conductive layer a microwave beam radiates out. Due to matching of the phase of the microwave and the placing of the individual holes in the pattern that the holes form, a predominant waveguide mode of the desired order is obtained.
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“Experimental Investigations into a Linearly Polarized Radial Slot Antenna for DBS TV in Austria”, by P. Davis et al., IEEE Transactions on Antennas and Propagation, vol. 45, No. 7, Jul. 1997, pp. 1123-1129.
Krig Torbjörn
Westerling Jan
A Minh Dieu
Nguyen Hoang V.
SAAB Rosemount Tank Radar AB
Westman Champlin & Kelly P.A.
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