US PATENT SUBCLASS 343 / 909
.~.~ Refracting means and radio wave energy filters (e.g., lenses and polarizers)

Current as of: June, 1999
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343 /   HD   COMMUNICATIONS: RADIO WAVE ANTENNAS

700 R  DF  ANTENNAS {58}
907  DF  .~ Antenna components {3}
909.~.~ Refracting means and radio wave energy filters (e.g., lenses and polarizers) {2}
910  DF  .~.~.~> Zoned type
911 R  DF  .~.~.~> Dielectric type {1}

DEFINITION

Classification: 343/909

(under subclass 907) Subject matter including components which transmit therethrough a radio wave which impinges thereon from space and returns the wave to space after it has passed through and which modify the wave in transmission therethrough usually by delaying or accelerating some portions of the wave more than others, as follows: (1) alters the direction of propagation of the wave, as by refraction; (2) brings the wave front to a focus or converts a plane wave front to a spherical wave front or vice versa (3) changes the type of polarization, e.g., converts a plane polarized wave to a circularly polarized wave, or rotates the plane of polarization; (4) filters one or more polarization components (5) filters one or more frequency components.

(1) Note. This subject matter need not be closely

associated with an antenna, but may be applied to a radio beam remote from any antenna, or in a wave guide.

SEE OR SEARCH THIS CLASS, SUBCLASS:

753+, for antennas with spaced electromagnetic lenses or diffractors.

756, for antennas with a polarization filter.

783, for wave guide type antennas having an internal wave refraction means. 912+, for reflectors or directors, per se, which do not transmit the electromagnetic wave therethrough.

SEE OR SEARCH CLASS

250, Radiant Energy, especially

505+, for electromagnetic wave polarizers, filters, screens, lenses or refractors, per se, exclusive of infrared, visible light and ultraviolet electromagnetic radiation controlling elements.

333, Wave Transmission Lines and Networks, particularly

21, 24+, and 248+ for wave transmission systems which may include electromagnetic lenses or refractors; and subclasses 167+ for wave filters.

342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),

1, 205 and 350+ for radio energy communication systems, such as reflected wave systems and beacons, which may include radio wave lenses or refractors.

359, Optics: Systems (Including Communication) and Elements,

483+, for optical polarizers, subclasses 642+ for optical lenses, and subclasses 350+ 885+ and for optical filters.