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An electromagnetic field (also EMF or EM field) is a magnetic field produced by moving electrically charged objects. It affects the behavior of non-comoving charged objects at any distance of the field. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction).
Patch antenna with wire radiation elements for high-precision GNSS applications
ActiveUS20190140354A1Reduced directional patternLower levelSimultaneous aerial operationsSubstantially flat resonant elementsNadirPower flow
A right-hand circularly-polarized patch antenna comprising a ground plane and a patch connected to each other with one or more wires for which the wire shape and location of the end points are selected such that they do not cause an antenna mismatch, and the electrical current carried in the wires produces an extra electromagnetic field subtracted from the patch field in the nadir direction.
Owner:TOPCON POSITIONING SYST INC