US PATENT SUBCLASS 343 / 834
.~ Antenna with parasitic reflector

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

700 R  DF  ANTENNAS {58}
834.~ Antenna with parasitic reflector {4}
835  DF  .~.~> Plural active antennas {1}
837  DF  .~.~> Plural reflectors {1}
839  DF  .~.~> Reflector and active antenna relatively movable
840  DF  .~.~> Parabolic-type reflector with active antenna at focus

DEFINITION

Classification: 343/834

(under subclass 700) Subject matter wherein an active antenna is combined with conductive structure (usually metallic, e.g., screen rod or plate) which returns or reradiates back into free space impinging radio waves coming from or going to the active antenna, the velocity of the returned wave having a component in a direction opposite to the direction of velocity of the impinging wave, thereby to modify the radiation pattern of the active antenna, there being no significant potential relationship between the active antenna and the conductive structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

755, for antennas with spaced radio wave lens or diffractor with a reflector; for waveguide-type antennas with reflectors.

757+, for directive antennas with means for moving the antennas for scanning, sweeping or orienting, which may include reflectors; and particularly indented subclass 761 for a reflector and antenna relatively movable.

779, 780, and 781+, for waveguide-type antennas with reflectors.

815, 817 and 818+, for balanced doublet antennas with reflectors. 829+, for fractional, multiple, or full wave linear type antennas with grounding structure.

832, where the reflector is also an active antenna.

833, for antennas with a director.

841+, for antennas with electrical shields.

846+, for antennas with grounding structure including counterpoises.

878+, for antenna and/or reflector with supports.

912+, for reflectors or directors, per se, and see also the search notes under subclass 912.