Greetings EMC Professionals! We have a 10 Meter Open Area Test Site in our parking lot. The Ground Plane is covered by 3 inches of concrete, and measures 29.4 meters by 7.9 meters. There are several planters within the 2R x 1.73R 10-Meter ellipse as described in ANSI C63.4. The Power and Signal Coax are run along the top of the ground plane, as underground installation is not an option. I am attempting to improve the performance of this site. The alterations I am considering are:
1) Installing a solid ground plane on TOP of the concrete. 2) Extending the width of the ground plane to 11.4 meters. I have four questions to pose to the group: Question #1 - Does anyone have experience with an OATS where the ground plane is covered with concrete? What effect does this have on the performance of the site? Question #2 - ANSI C63.4:1992 does not specify the minimum size of the ground plane. Is there a guideline, or can someone tell me from experience, what the minimum size should be? Question #3 - Does anyone have any feelings on what the effect of running the COAX and Power Cables on top of the Ground Plane can have on the site performance? Would It be better to raise the ground plane off the ground (on a wooded platform) in order to run all of the cables under the GRP? Question #4 - Although there are several trees with in the 10 meter Ellipse, they are located at the very edges of the Ellipse. However, there are raised concrete curb planters and waist-high hedges that are well within the Ellipse. Can I expect these items to cause significant site abnormalities? Also, how far away does a metal object need to be before I can consider it safe from causing abnormalities due to reflections? Any insight or suggestions on this matter would be greatly appreciated. Thanks for your time. Regards, Randy Flinders EMC Engineer Emulex Network Systems (714) 513-8012 [email protected]
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