US PATENT SUBCLASS 343 / 820
.~.~ With coupling network or impedance in the leadin

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}
820.~.~ With coupling network or impedance in the leadin {2}
821  DF  .~.~.~> Balanced to unbalanced circuit
822  DF  .~.~.~> Impedance matching network

DEFINITION

Classification: 343/820

(under subclass 793) Subject matter wherein the doublet antenna is combined with a passive network (which may be resistive, inductive or capacitive or any combination thereof) for transmitting signal energy between the doublet

and a source or receiver of such signal energy.

(1) Note. For an explanation of the terms used in the above definition and distinctions between coupling and tuning subclasses, see (1) to (4) Notes under subclass 850 below. For more comprehensive search notes to other classes see those under subclass 850, below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

722, for antennas having lumped reactance filters between active antenna sections.

730, for plural diverse type antennas one of which is a doublet having a common active radiating or collecting portion with the other being usually coupling having both balanced and unbalanced sections to pass high and low frequency currents according to the operation in question of the antenna as a doublet or other antenna respectively.

745+, for antennas with variable reactance for tuning. 749+, for antennas having lumped reactance for loading.

814, and 816, for plural doublets with coupling networks.

850+, for antennas with coupling networks in general. See also (1) Note, above.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks, particularly

1+, and 24+, for wave transmission coupling networks in general.