US PATENT SUBCLASS 343 / 818
.~.~ With parasitic element (e.g., reflector or director)


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

700 R  DF  ANTENNAS {58}
793  DF  .~ Balanced doublet - centerfed (e.g., dipole) {17}
818.~.~ With parasitic element (e.g., reflector or director) {1}
819  DF  .~.~.~> With reflector and director


DEFINITION

Classification: 343/818

(under subclass 793) Subject matter wherein the two active

conductive masses are combined with conductive (usually metallic) structure (e.g., a rod) which reradiates into free space impinging radio waves coming from or going to the antenna, the velocity of the reradiated wave having a component which is in the same direction (director) as, or in the opposite direction (reflector) to, that of the velocity of the impinging wave.

SEE OR SEARCH THIS CLASS, SUBCLASS:

761, for reflector and antenna relatively movable, together with means for effecting such motion for scanning, sweeping or orienting.

813, and 815, for plural parallel balanced doublets with parasitic elements.

817, for plural balanced doublets generally with parasitic elements.

832, for subject matter including an active antenna which also acts as a reflector. 833, for antennas in general with parasitic directors.

834+, and the Search Notes thereunder, for antennas in general with parasitic reflectors.

878+, for reflectors or directors generally with supports therefor.

912+, for reflectors or directors, per se.