Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01Q
ANTENNAS, i.e. RADIO AERIALS
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19/00
Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
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H01Q19/06
using refracting or diffracting devices, e.g. lens
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