Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01P
WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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H01P1/165
for rotating the plane of polarisation
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H01P1/17
for producing a continuously rotating polarisation, e.g. circular polarisation
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H01P1/171
using a corrugated or ridged waveguide section
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