US Patent Class 333
WAVE TRANSMISSION LINES AND NETWORKS



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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  PLURAL CHANNEL SYSTEMS
1.1  DF  .~ Nonreciprocal gyromagnetic type (e.g., circulators)
2  DF  .~ With automatic control
3  DF  .~.~ Line substitution
4  DF  .~ With balanced circuits
5  DF  .~.~ Plural balanced circuits
100  DF  .~ Having branched circuits
101  DF  .~.~ Including switching means
102  DF  .~.~.~ Having gyromagnetic operating means
103  DF  .~.~.~ Having semiconductor operating means
104  DF  .~.~.~.~ Using TEM lines
105  DF  .~.~.~ Having mechanical switching means
106  DF  .~.~.~.~ Using rotary switching means
107  DF  .~.~.~.~.~ For TEM lines
108  DF  .~.~.~.~ For waveguide
109  DF  .~.~ Using directional coupler
110  DF  .~.~.~ For providing frequency separation
111  DF  .~.~.~ For providing adjustable coupling
112  DF  .~.~.~ Having lumped parameters or impedances
113  DF  .~.~.~ Having parallel-guide waveguide
114  DF  .~.~.~ Having crossed-guide waveguide
115  DF  .~.~.~ Having TEM lines
116  DF  .~.~.~.~ Using stripline
117  DF  .~.~ Including hybrid-type network
118  DF  .~.~.~ Having lumped parameters or impedances
119  DF  .~.~.~.~ Using transformer coil
120  DF  .~.~.~ Having hybrid ring junction
121  DF  .~.~.~ Having hybrid-T (e.g., magic-T)
122  DF  .~.~.~.~ Using waveguide
123  DF  .~.~.~ Having coaxial element
124  DF  .~.~ With impedance matching
125  DF  .~.~.~ Including long line element
126  DF  .~.~.~.~ For providing frequency separation
127  DF  .~.~.~.~ Using TEM lines
128  DF  .~.~.~.~.~ Stripline
129  DF  .~.~.~ For providing frequency separation
130  DF  .~.~.~ Using resistors only
131  DF  .~.~.~ Using coupled windings
132  DF  .~.~ For providing frequency separation
133  DF  .~.~.~ Utilizing electromechanical transducer
134  DF  .~.~.~ Utilizing long line element
135  DF  .~.~.~.~ Including waveguide element
136  DF  .~.~ Including long line element
137  DF  .~.~.~ Using waveguide
12  DF  TRANSMISSION LINE INDUCTIVE OR RADIATION INTERFERENCE REDUCTION SYSTEMS
13  DF  RESONATOR-TYPE BREAKDOWN DISCHARGE SYSTEMS (E.G., T-R OR R-T SYSTEMS)
14  DF  AMPLITUDE COMPRESSION AND EXPANSION SYSTEMS (I.E., COMPANDERS)
15  DF  PILOT LINE-CONTROLLED SYSTEMS
16  DF  PILOT CURRENT-CONTROLLED SYSTEMS
17.1  DF  AUTOMATICALLY CONTROLLED SYSTEMS
17.2  DF  .~ Limiting of amplitude
17.3  DF  .~ Impedance matching
18  DF  .~ With control of equalizer and/or delay network
19  DF  DIFFERENTIATING OR INTEGRATING SYSTEMS
20  DF  WAVE-SHAPING
21 R  DF  WAVE MODE CONVERTERS
21 A  DF  .~ Polarization converters
22 R  DF  DISSIPATING TERMINATIONS FOR LONG LINES
22 F  DF  .~ Fluid-cooling
23  DF  ARTIFICIAL LINES
24 R  DF  COUPLING NETWORKS
24.1  DF  .~ Nonreciprocal gyromagnetic type (e.g., directional phase shifters)
24.2  DF  .~.~ Nonreciprocal attenuators or isolators
24.3  DF  .~.~ Nonreciprocal polarization rotators
25  DF  .~ Balanced to unbalanced circuits
26  DF  .~.~ Having long line elements
27  DF  .~ Interlinking long line
28 R  DF  .~ Equalizers
28 T  DF  .~.~ Audio tone control
138  DF  .~ Delay lines including a lumped parameter
139  DF  .~.~ Variable parameter
140  DF  .~.~ Physical structure
141  DF  .~ Delay lines including elastic bulk wave propagation means
142  DF  .~.~ Multipath propagation
143  DF  .~.~.~ Spurious signal reduction
144  DF  .~.~ Variable delay
145  DF  .~.~ Nonuniform propagation path
146  DF  .~.~ Helical propagation path
147  DF  .~.~ Propagation path has significant chemical or physical properties
148  DF  .~.~ Including magnetostrictive transducers
149  DF  .~.~ Significant transducer structure
150  DF  .~ Delay lines including elastic surface wave propagation means
151  DF  .~.~ Spurious signal or mode cancellation means
152  DF  .~.~ Variable delay
153  DF  .~.~ Including discontinuities within propagation means
154  DF  .~.~ Significant transmitting or receiving transducer structure
155  DF  .~.~ Temperature stabilization or compensation
156  DF  .~ Delay lines including long line elements
157  DF  .~.~ Waveguide
158  DF  .~.~.~ Including ferrite means
159  DF  .~.~.~ Having mechanically movable delay control means
160  DF  .~.~ Coaxial line
161  DF  .~.~ Planar line structure (e.g., stripline)
162  DF  .~.~ Helical line structures and lines developed from a helical structure
163  DF  .~.~.~ Having plural concentric helices
164  DF  .~.~ Control of delay with semiconductive means
32  DF  .~ With impedance matching
33  DF  .~.~ Having long line elements
34  DF  .~.~.~ Tapered
35  DF  .~.~.~ Quarter-wave transformer type
165  DF  .~ Frequency or time domain filters and delay lines utilizing charge transfer devices
166  DF  .~ Time domain filters
167  DF  .~ Frequency domain filters utilizing only lumped parameters
168  DF  .~.~ Including recurrent sections
169  DF  .~.~ Wheatstone or lattice type
170  DF  .~.~ Bridge type
171  DF  .~.~.~ With variable response
172  DF  .~.~ RC or RL type
173  DF  .~.~ Synchronous filters
174  DF  .~.~ With variable response
175  DF  .~.~ Resonant, discrete frequency selective type
176  DF  .~.~.~ Including specific frequency rejection means
177  DF  .~.~ Transformer coupled
178  DF  .~.~.~ Including bandwidth adjusting, shaping, or stabilization means
179  DF  .~.~.~ With permeability tuning means
180  DF  .~.~.~ With variable coupling means
181  DF  .~.~ Smoothing type (e.g., direct current power supply filters or decoupling filters)
182  DF  .~.~.~ Feedthrough type
183  DF  .~.~.~.~ Resiliently mounted components
184  DF  .~.~.~ Monolithic structure
185  DF  .~.~ Having significant physical structure
186  DF  .~ Electromechanical filter
187  DF  .~.~ Using bulk mode piezoelectric vibrator
188  DF  .~.~.~ With means for varying response
189  DF  .~.~.~ Plural coupled vibrators
190  DF  .~.~.~.~ Lattice structure
191  DF  .~.~.~.~ Monolithic structure
192  DF  .~.~.~.~.~ With electrical coupling
193  DF  .~.~ Using surface acoustic waves
194  DF  .~.~.~ Including spurious signal prevention or reduction means
195  DF  .~.~.~ With wave-modifying means (e.g., reflectors, resonators, diffractors, multistrip couplers, etc.)
196  DF  .~.~.~ With response weighting means
197  DF  .~.~ Plural mechanically coupled bar, plate, or rod-type resonating means
198  DF  .~.~.~ Plural interresonator coupling paths
199  DF  .~.~.~ Plural mechanically coupled disk resonators
200  DF  .~.~ Reed- or fork-type resonators
201  DF  .~.~ Magnetostrictive wave transmission path
202  DF  .~ Wave filters including long line elements
203  DF  .~.~ Digital structure
204  DF  .~.~ Stripline or microstrip
205  DF  .~.~.~ Tunable
206  DF  .~.~ Coaxial
207  DF  .~.~.~ Tunable
208  DF  .~.~ Waveguide
209  DF  .~.~.~ Tunable
210  DF  .~.~.~ Including evanescent guide sections
211  DF  .~.~.~ Including frequency selective absorbing means
212  DF  .~.~.~ Including directly coupled resonant sections
24 C  DF  .~ Capacity coupling
213  DF  NEGATIVE RESISTANCE OR REACTANCE NETWORKS OF THE ACTIVE TYPE
214  DF  .~ Simulating specific type of reactance
215  DF  .~.~ Using gyrator
216  DF  .~ Having negative impedance
217  DF  .~.~ Providing negative resistance
81 R  DF  ATTENUATORS
81 A  DF  .~ Coaxial or microstrip
81 B  DF  .~ Waveguide type
218  DF  FREQUENCY MULTIPLIERS
219  DF  RESONATORS (DISTRIBUTED PARAMETER TYPE)
219.1  DF  .~ Dielectric type
219.2  DF  .~ Magnetic type
220  DF  .~ Open wire or Lecher line
221  DF  .~.~ With tuning
222  DF  .~ Coaxial or shielded
223  DF  .~.~ With tuning
224  DF  .~.~.~ Having movable element
225  DF  .~.~.~.~ Using movable shorting means
226  DF  .~.~.~.~ Using plunger, rod, or piston
227  DF  .~ Cavity resonator
228  DF  .~.~ With mode suppressor
229  DF  .~.~ With temperature compensation
230  DF  .~.~ With coupling
231  DF  .~.~ With tuning
232  DF  .~.~.~ Having movable element
233  DF  .~.~.~.~ Using movable wall
234  DF  .~ Temperature compensated
235  DF  .~ With tuning
236  DF  LONG LINES
237  DF  .~ Leaky lines
238  DF  .~ Strip type
239  DF  .~ Waveguide type
240  DF  .~.~ Surface wave
241  DF  .~.~ Flexible
242  DF  .~.~ Circular or helical structure
243  DF  .~ Shielded type
244  DF  .~.~ Including spaced, electrically compensated, internal support means
245  DF  LONG LINE ELEMENTS AND COMPONENTS
246  DF  .~ Strip type
247  DF  .~.~ Semiconductor mounts
248  DF  .~ Waveguide elements and components
249  DF  .~.~ Bend
250  DF  .~.~ Active element mounting
251  DF  .~.~ Mode suppressor
252  DF  .~.~ Window
253  DF  .~.~ Including variable impedance
254  DF  .~.~ Connectors and interconnections
255  DF  .~.~.~ Quick disconnect
256  DF  .~.~.~ Movable
257  DF  .~.~.~.~ In line
258  DF  .~.~ Switch
259  DF  .~.~.~ Mechanically movable
260  DF  .~ Connectors and interconnections
261  DF  .~.~ Rotary coupling
262  DF  .~ Switch
263  DF  .~ Including variable impedance
99 R  DF  MISCELLANEOUS
99 S  DF  .~ Superconductive
99 PL  DF  .~ Plasma
99 MP  DF  .~ Multipactor applications