How do I configure the test system and system under test to create angle-of-arrival?
Currently, there are two ways. Both methods require changing SUT port parameters since the angle-of-arrival is created relative to the SUT ports. In the following example, we will create two-port angle-of-arrival as seen by the SUT at a center frequency of 10 GHz.
In the ‘Property View,’ click on ‘PortGroup1’ and add a port.
The first method of creating angle-of-arrival (AoA) involves formatting antenna data as explained in the MESG help. Antenna data can be taken from EMPRo or HFSS simulations or from antenna measurements. Currently MESG creates angle-of-arrival only for a single center frequency because the antenna data look-up is only for a single center frequency. Multi-frequency antenna data look-up is planned.
Select each SUT port and change the antenna radiation pattern to ‘Table Look Up.’
Click on the ‘Table List Data’ icon to bring up the following menu and click on the ‘import’ icon to bring up a file import dialog. Navigate to the folder containing the antenna data file. Repeat the above for the other SUT antenna port.
A complete example of this type of an AoA setup is found in the simulation examples.
Click ‘Open’ -> ‘Open Simulation Example’-> ‘AoA Two Channel Monopulse Case.mesg’
Clicking again on the ‘Table List Data’ icon for each SUT port shows a populated complex antenna pattern table for each azimuth and elevation.
To use the second method, separate the antenna elements by the number of wavelengths desired for the center frequency used. For example, to separate two antenna ports by one wavelength to test a two-port interferometer at 10 GHz, click on SUT port 1 and change the antenna position X to .015 meters. Click on SUT port 2 and change the antenna position X to -.015 meters. The dialog box shows only one significant digit.
The amplitude pattern can be changed by changing the antenna radiation pattern to one of the built-in types (such as sinc) and changing the 3 dB beamwidths and gain.
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