CPC H01Q 3/36 (2013.01) | 20 Claims |
1. A phase shifter, comprising:
a first substrate and a second substrate that are disposed opposite to each other;
a ground electrode disposed on a side of the first substrate facing towards the second substrate;
a transmission electrode disposed on a side of the second substrate facing towards the first substrate, wherein the transmission electrode overlaps the ground electrode in a direction perpendicular to a plane of the second substrate; and
liquid crystals filled between the first substrate and the second substrate,
wherein the ground electrode is provided with at least one detection hollow part, and at least a part of the at least one detection hollow part does not overlap the transmission electrode in the direction perpendicular to the plane of the second substrate in such a manner that a light transmittance area through which detection light provided to the phase shifter is transmitted is formed in a liquid crystal cell of the phase shifter to allow the detection light to pass through the second substrate, the liquid crystals, and the at least one detection hollow part.
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