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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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Disclosed is a ground plane constructed of parallel metal strips which improves the accuracy of radiation measurements by reducing reflections of electromagnetic waves from the sides of the ground plane.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
90% of the total text.
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Grated Ground Plane
Disclosed is a ground plane constructed of parallel metal strips which
improves the accuracy of radiation measurements by reducing reflections of
electromagnetic waves from the sides of the ground plane.
Radiated emissions from products are measured over metal ground planes to
determine compliance with regulatory requirements, such as the FCC Rules.
Conventional ground planes are made of solid metal or wire mesh. See Fig. 1.
The product (or source) 1 is placed on the ground plane 2 and a receiving
antenna 3 is placed a specified distance away (usually 3, 10 or 30 meters).
Theoretically accurate measurements of the fields radiated by the product
would be obtained on an ideal ground plane, defined as a perfectly conducting
plane of infinite extent. Reflections from the edges of finite size ground planes
add or subtract from the direct wave and cause the fields to differ from those on
an ideal ground plane, resulting in errors in the field strength measurements,
especially for vertically polarized fields.
A ground plane constructed of parallel metal strips 4 aligned in the direction
of the source-antenna axis offers a low impedance to waves flowing in the
direction of the source-antenna axis and a high impedance in a direction normal
to this axis. This results in a reduction of the reflections from the sides of the
ground plane and more accurate measurements of the fields radiated from the
The grated ground plane can be smaller in size t...