Dual polarization electromagnetic field simulator

Communications: radio wave antennas – Antennas – Measuring signal energy

Patent

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Details

343786, H01Q 1300, G01R 2910

Patent

active

059823313

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to electromagnetic simulators used for testing the behaviour of equipment in the presence of strong electromagnetic fields. The simulator of this invention provides for the simultaneous presence of electromagnetic fields of differing polarization in a test area.
Electromagnetic simulators are disclosed in U.S. Pat. No. 5,440,316 issued Aug. 8, 1995 to Podgorski. The structure shown in FIG. 5 of that patent is a simulator employing vertically polarized electromagnetic waves in the test area and the structure shown in FIG. 10 is a simulator employing horizontally polarized waves in the test area.


SUMMARY OF THE INVENTION

This application relates to simulator structures which produce electromagnetic waves of differing polarization in the test area at the same time, thereby reducing the testing time.


DESCRIPTION OF THE DRAWING

The foregoing, and additional objects, features, and advantages of the present invention will become apparent to those of skill in the art from the following detailed description of a preferred embodiment thereof, taken with the accompanying drawings, in which:
FIG. 1 is a perspective view of the simulator showing internal elements and with the vertical polarization components highlighted;
FIGS. 1A and 1B show alternative terminations for the conducting arrays;
FIG. 1C shows details of the feed to the horn antenna used in the simulator of FIG. 1;
FIG. 2 shows a perspective view of the simulator similar to that of FIG. 1 with different terminations for the conducting arrays;
FIG. 3 shows a perspective view similar to FIG. 1 but with the horizontal polarization components highlighted;
FIG. 4 shows a perspective view of another embodiment of the simulator with the vertical polarization components highlighted;
FIG. 5 shows a perspective view of the simulator similar to FIG. 4 but with different terminations for the conducting arrays;
FIG. 6 shows a perspective view of the simulator similar to FIG. 4 but with the horizontal polarization components highlighted;
FIG. 7 shows a perspective view of the simulator similar to FIG. 6 but with different terminations for the conducting arrays;
FIG. 8 is a view taken along the line A--A of FIG. 4;
FIG. 9 is a perspective view of another embodiment of the simulator with vertical polarization components highlighted;
FIG. 10 is a perspective view similar to FIG. 9 but with different terminations for the conducting arrays;
FIG. 11 is a perspective view similar to FIG. 9 with the horizontal polarization components highlighted;
FIG. 12 is a perspective view similar to FIG. 11 but with different terminations for the conducting arrays.
FIGS. 13 and 14 show modifications to the configuration of the transmission lines used to define the test area;
FIG. 15 shows the simulator of FIG. 1 with a further modified transmission line;
FIGS. 16 and 17 show another form of the simulator of this invention providing a circulatory polarized field in the test area;
FIG. 18 shows detail of the signal feed to the simulator of FIGS. 16 and 17;
FIG. 19 shows a modification to the simulator of FIGS. 9 to 12 to produce a more uniform field;
FIG. 20 shows a modification to the simulator of FIGS. 16 and 17 providing a selected angle of polarization;
FIG. 20A shows details of the signal feed to the simulator of FIG. 20;
FIG. 21 shows a modification to the simulator of FIG. 1 to provide improved field uniformity in the test area;
FIG. 22 shows a modification to the simulator of FIG. 1, capable of multi-octave bandwidth operation and having maximum frequency of operation higher than 1 GHz at low and medium power levels;
FIG. 23 shows a cut through the perspective view of the broadband TEM-horn antenna of FIG. 22;
FIG. 24 shows another modification to the simulator of FIG. 1, capable of multi-octave bandwidth operation and having maximum frequency of operation higher than 1 GHz at high power levels; and
FIG. 25 shows a cut through the perspective view of the broadband TEM-horn antenna of FIG. 24.


DESCRIPTION OF THE PREFERRED EMBO

REFERENCES:
patent: 4962384 (1990-10-01), Walker
patent: 5039949 (1991-08-01), Hemming et al.
patent: 5237283 (1993-08-01), Carbonini
patent: 5440316 (1995-08-01), Podgorski et al.
patent: 5757194 (1998-05-01), Yun

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