US PATENT SUBCLASS 343 / 850
.~ 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}
850.~ With coupling network or impedance in the leadin {9}
851  DF  .~.~> With radiation suppressor (e.g., shield)
852  DF  .~.~> Plural path with impedance matching
853  DF  .~.~> With plural antennas {1}
856  DF  .~.~> Antenna forms transformer primary or secondary
857  DF  .~.~> Coupling at spaced points on antenna
858  DF  .~.~> Coupled to plural leadins
859  DF  .~.~> Balanced to unbalanced circuit
860  DF  .~.~> Impedance matching network {2}
865  DF  .~.~> Balanced coupling network to balanced antenna

DEFINITION

Classification: 343/850

(under subclass 700) Subject matter wherein an active antenna is combined with a passive network (which may be resistive, inductive, or capacitive or any combination thereof) for transmitting the signal energy between the active antenna and a source or receiver of such signal energy.

(1) Note. Where the impedance network is located at the junction of the leadin and the antenna and the function of such impedance is loading or tuning the natural frequency of the antenna, classification is in subclasses 745+ or 749+. However, where the network is so located and the function is coupling, and there is no loading or tuning of the natural resonant frequency of the antenna classification is in this subclasses (850+ ) as opposed to subclasses 745+ or 749+. See subclasses 745+ and 749+ and the Notes thereto for definitions of antennas with tuning and loading, respectively.

(2) Note. Mere recitation of a transmission line or lead-in wire joining the antenna to its signal source or load without any significant electrical characteristics is not sufficient for classification here. Such subject matter, including structural characteristics of the transmission line, is classified in subclass 905, below.

(3) Note. The combination of a coupling network as defined

above with an antenna network recited by name only is sufficient for classification in this subclass as opposed to Class 333, Wave Transmission Lines and Networks, where coupling networks, per se, as there defined are classified.

(4) Note. Combinations of an antenna, coupling network, and a receiver or transmitter are classified in this and indented subclasses, unless an active element or network, or significant structure of a transmitter or receiver is claimed. For definitions of active element or significant structure see (3) Note under subclass 858, below.

SEE OR SEARCH THIS CLASS, SUBCLASS: 722, for antennas having filters in the active antenna.

731+, and 739+, for antennas having energy absorbing means remote from the feed line coupling or having feed back coupling.

745+, for antennas with variable reactance for tuning. See also (1) Note, above.

749+, for antennas having lumped inductance or capacity for loading. See also (1) Note, above.

771, for plural slot type antennas with wave guide coupling.

814, 816 and 820, for balanced doublets having a coupling network or impedance in the leadin.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems, pertinent subclasses, for miscellaneous electrical transmission or interconnection systems.

323, Electricity: Power Supply or Regulation Systems, pertinent subclasses, for voltage magnitude and phase control systems.

333, Wave Transmission Lines and Networks,

1+, for plural channel systems involving coupling networks, and subclasses 24+ for coupling networks, per se.