(under subclass 700) Subject matter wherein the active antenna is combined with structure which acts directly on the radio wave to filter out wave energy of an undesired polarization or to modify the polarization pattern of the wave.
(1) Note. The polarizing structure is usually a series of parallel rods (polarization grating) through which the waves pass or from which impinging waves are reflected. The polarizing structure may be spaced from or within the antenna, such as, in the latter case, within a wave guide horn or within a dielectric rod antenna.
SEE OR SEARCH THIS CLASS, SUBCLASS:
753+, for active antennas with spaced electromagnetic refractors which may also include polarization modifying means.
909+, for refracting means and radio wave filters, per se, including polarization modifying means.
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks, 21, for wave mode converters.
359, Optics: Systems (Including Communication) and Elements,
483+, for optical polarizers.
362, Illumination,
19, for illuminating means combined with polarization means.
