.~ With coupling network or impedance in the leadin {9}
858
.~.~ Coupled to plural leadins
DEFINITION
Classification: 343/858
(under subclass 850) Subject matter wherein the passive network has one termination to which an antenna is connected, and has in addition a plurality of distinct terminations, adapted to be connected to a plurality of transmitters and/or receivers; the coupling network providing a branched electrical path from the antenna termination to the other terminations.
(1) Note. Subject matter involving the combination of an antenna, transmitter and receiver, even in the event the transmitter and receiver are claimed by name only, are not classified in the subclass but will be found in Class 370, subclasses 276+ where the systems are duplexing systems (e.g., adapted for simultaneous transmission and reception of messages): otherwise, classification is in Class 455, Telecommunications, appropriate subclasses.
(2) Note. Combinations of an antenna, coupling network and a plurality of receivers or transmitters are classified in this subclass unless an active element or network, or significant structure of a transmitter or receiver is claimed. For definitions of active element or network, or significant structure, see (3) Note below. In such cases, where in addition the combination is adapted for simultaneous transmission or reception of plural messages (e.g., multiplexing) classification is in this class (370), appropriate subclasses, otherwise, classification falls with transmitters in Class 455, subclasses 91+ or with receivers subclasses 30+.
(3) Note. An active element or network is defined for purposes of classification as an element or network whose energy output is modified due to the presence of a source of energy in the element or network (other than the mere signal energy which passes through the network), or an element or
network in which the energy output from a source of energy is controlled by the signal input. For purposes of classification, those portions of the receiver or transmitter connected in immediate consecutive relationship with what may be termed the coupling network proper are not considered to be significant receiver or transmitter structure unless they contain an active element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
175+, and 200+, for duplexing and multiplexing radiant energy communication systems, respectively. See also (1) Note and (2) Note, above. 852, for a single antenna with a plural path coupling network, which also has impedance matching.
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks, particularly
1+, for plural channel wave transmission systems. See also the Search Notes under subclass 1 of Class 333.
455, Telecommunications,
132+, for radio receivers which may involve antennas with coupling to plural receivers.
