A. GENERAL STATEMENT OF THE CLASS SUBJECT MATTER
1. This class includes electric wave transmission systemswherein electromagnetic wave energy is guided or constrained bya wave transmission device of the long line type other than loadedlines.
2. Included are passive wave transmission networks simulatingthe characteristics of a long line wave transmission systems orwave guides, such as artificial lines, delay networks, resonators,impedance matching networks, equalizers, wave filters and transmissionline terminations.
3. Also included are passive coupling networks and terminatingnetworks having either lumped or distributed electrical circuitparameters and having impedance characteristics peculiarly adaptedfor use with the wave transmission systems of paragraph 1, above,or which are designed to be frequency responsive, or which are designedto be effective over or within a range of frequencies, for example,impedance matching networks, hybrid networks, coupling networks,wave shaping networks, phase shifting networks, wave filters, equalizers andattenuators.
4. Smoothing type wave filters having shunt capacitance, orseries inductance, or both, usually designed to pass direct currentand to reduce the effect of any undesired alternating or pulsatingcurrent superimposed on the direct current, or to pass direct currentand low frequency alternating current or pulsating current and to reducethe effect of an undesired higher frequency alternating or pulsatingcurrent.
5. Networks including a wave transmission device and meansfor decreasing the amplitude range of the signal applied to thetransmission device as the signal increases in amplitude and meansfor increasing or restoring the amplitude range of the signal afterthe transmission over the transmission device (i.e., companders).
6. Passive networks for producing an output wave which isthe time derivative or time integral of the input wave (i.e., differentiatingor integrating systems).
7. Systems including active elements for producing acrossat least two of the system terminals a negative resistance, and/oran inductance, or capacitance which may be positive or negative.
8. Wave traps using long line elements.
9. Transmission systems including only one or more of thesystems or networks defined in paragraphs 1 - 8, above, and suchsystems in combination with current or voltage magnitude controlmeans of the passive type. Systems including two or more of thenetworks or systems defined in paragraphs 1 - 8, above, are classifiedas set forth in the Class Definition, subsection C, below.
10. Components and elements not constituting a complete systemor network limited by claimed structure to use in the systems ornetwork of paragraph 1, above, and not otherwise classified, andalso long line elements.
B. ACTIVE NETWORK
The systems classified in this class ordinarily contain no activeelements, the only exceptions being the amplitude compression andexpansion systems (companders) and negative resistance and/orreactance networks of the active element type found in this class.See Subclass References to the Current Class, below.