|  | H |
SECTION H — ELECTRICITY

|  | H03 |
BASIC ELECTRONIC CIRCUITRY

|  | H03H |
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing Fulltext... Hierarchy... Expanded...G01R; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, Fulltext... Hierarchy... Expanded...H01P; control of amplification, e.g. bandwidth control of amplifiers, Fulltext... Hierarchy... Expanded...H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, Fulltext... Hierarchy... Expanded...H03J; networks for modifying the frequency characteristics of communication systems Fulltext... Hierarchy... Expanded...H04B)

|  | H03H |
Note(s) This sub-class deals with (a) networks comprising lumped impedance elements, (b) networks comprising distributed impedance elements together with lumped impedance elements, (c) networks comprising electromechanical or electro-acoustic devices, (d) networks simulating reactances and comprising discharge tubes or semiconductor devices, and (e) constructions of electromechanical resonators. In this sub-class, the term "passive elements" refers to resistors, capacitors, inductors, mutual inductors, or diodes. [3] Main groups with a higher number take precedence. [3]

|  | H03H 1/00 |
Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers Fulltext... Hierarchy... Expanded...H03H 9/00)

|  | H03H 1/02 |
· | of RC networks, e.g. integrated networks [3]

|  | H03H 2/00 |
Networks using elements or techniques not provided for in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03H 3/00-H03H 21/00 [3]

|  | H03H 3/00 |
Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators

|  | H03H 3/007 |
· | for the manufacture of electromechanical resonators or networks [3]

|  | H03H 3/013 |
· · | for obtaining desired frequency or temperature coefficient (Fulltext... Hierarchy... Expanded...H03H 3/04, Fulltext... Hierarchy... Expanded...H03H 3/10 take precedence) [3]

|  | H03H 3/02 |
· · | for the manufacture of piezo-electric or electrostrictive resonators or networks (Fulltext... Hierarchy... Expanded...H03H 3/08 takes precedence)

|  | H03H 3/04 |
· · · | for obtaining desired frequency or temperature coefficient

|  | H03H 3/06 |
· · | for the manufacture of magnetostrictive resonators or networks

|  | H03H 3/08 |
· · | for the manufacture of resonators or networks using surface acoustic waves [3]

|  | H03H 3/10 |
· · · | for obtaining desired frequency or temperature coefficient [3]

|  | H03H 5/00 |
One-port networks comprising only passive electrical elements as network components

|  | H03H 5/02 |
· | with no voltage- or current-dependent elements

|  | H03H 5/04 - H03H 5/08 |
( covered by Fulltext... Hierarchy... Expanded...H03H 5/02 )

|  | H03H 5/10 |
· · | comprising at least one element with prescribed temperature coefficient

|  | H03H 5/12 |
· | with at least one voltage- or current-dependent element

|  | H03H 7/00 |
Multiple-port networks comprising only passive electrical elements as network components (receiver input circuits Fulltext... Hierarchy... Expanded...H04B 1/18; networks simulating a length of communication cable Fulltext... Hierarchy... Expanded...H04B 3/40)

|  | H03H 7/01 |
· | frequency selective two-port networks [3]

|  | H03H 7/02 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/01, covered by Fulltext... Hierarchy... Expanded...H03H 7/00 )

|  | H03H 7/03 |
· · | comprising means for compensation of loss [3]

|  | H03H 7/04 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/01 )

|  | H03H 7/06 |
· · | including resistors (Fulltext... Hierarchy... Expanded...H03H 7/075, Fulltext... Hierarchy... Expanded...H03H 7/09, Fulltext... Hierarchy... Expanded...H03H 7/12, Fulltext... Hierarchy... Expanded...H03H 7/13 take precedence)

|  | H03H 7/065 |
· · · | Parallel T-filters [3]

|  | H03H 7/07 |
· · · | Bridged T-filters [3]

|  | H03H 7/075 |
· · | Ladder networks, e.g. electric wave filters [3]

|  | H03H 7/08 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/01, Fulltext... Hierarchy... Expanded...H03H 7/09 )

|  | H03H 7/09 |
· · | Filters comprising mutual inductance [3]

|  | H03H 7/10 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/01 )

|  | H03H 7/12 |
· · | Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency (Fulltext... Hierarchy... Expanded...H03H 7/09 takes precedence; automatic control of bandwidth in amplifiers Fulltext... Hierarchy... Expanded...H03G 5/16)

|  | H03H 7/13 |
· · | using electro-optic elements [3]

|  | H03H 7/14 - H03H 7/16 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/01 )

|  | H03H 7/18 |
· | Networks for phase shifting

|  | H03H 7/19 |
· · | Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [3]

|  | H03H 7/20 |
· · | Two-port phase shifters providing an adjustable phase shift

|  | H03H 7/21 |
· · | providing two or more phase shifted output signals, e.g. n-phase output [3]

|  | H03H 7/22 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/19, Fulltext... Hierarchy... Expanded...H03H 7/21, covered by Fulltext... Hierarchy... Expanded...H03H 7/18, Fulltext... Hierarchy... Expanded...H03H 7/20 )

|  | H03H 7/24 |
· | Frequency-independent attenuators

|  | H03H 7/25 |
· · | comprising an element controlled by an electric or magnetic variable (Fulltext... Hierarchy... Expanded...H03H 7/27 takes precedence) [3]

|  | H03H 7/26 |
( covered by Fulltext... Hierarchy... Expanded...H03H 7/24 )

|  | H03H 7/27 |
· · | comprising a photo-electric element [3]

|  | H03H 7/28 |
( transferred to Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03H 15/00-H03H 21/00 )

|  | H03H 7/30 |
· | Time-delay networks

|  | H03H 7/32 |
· · | with lumped inductance and capacitance

|  | H03H 7/34 |
· · | with lumped and distributed reactance

|  | H03H 7/36 |
( covered by Fulltext... Hierarchy... Expanded...H03H 7/30 )

|  | H03H 7/38 |
· | Impedance-matching networks

|  | H03H 7/40 |
· · | Automatic matching of load impedance to source impedance

|  | H03H 7/42 |
· | Balance/unbalance networks

|  | H03H 7/44 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 11/08, Fulltext... Hierarchy... Expanded...H03H 11/42, Fulltext... Hierarchy... Expanded...H03H 11/50 )

|  | H03H 7/46 |
· | Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source (for use in multiplex transmission systems Fulltext... Hierarchy... Expanded...H04J 1/00)

|  | H03H 7/48 |
· | Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (phase shifters providing two or more output signals Fulltext... Hierarchy... Expanded...H03H 7/21)

|  | H03H 7/50 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 7/21 )

|  | H03H 7/52 |
· | One-way transmission networks, i.e. unilines

|  | H03H 7/54 |
· | Modifications of networks to reduce influence of variations of temperature [3]

|  | H03H 9/00 |
Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators (making single crystals Fulltext... Hierarchy... Expanded...C30B; selection of materials thereof Fulltext... Hierarchy... Expanded...H01L; piezo-electric, electrostrictive or magnetostrictive devices in general Fulltext... Hierarchy... Expanded...H01L 41/00; electromechanical transducers Fulltext... Hierarchy... Expanded...H04R)

|  | H03H 9/02 |
· | Details

|  | H03H 9/04 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/05, Fulltext... Hierarchy... Expanded...H03H 9/125 )

|  | H03H 9/05 |
· · | Holders; Supports [3]

|  | H03H 9/06 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/09, Fulltext... Hierarchy... Expanded...H03H 9/125 )

|  | H03H 9/08 |
· · · | Holders with means for regulating temperature

|  | H03H 9/09 |
· · · | Elastic or damping supports [3]

|  | H03H 9/10 |
· · · | Mounting in enclosures

|  | H03H 9/12 |
· · · · | for networks with interaction of optical and acoustic waves

|  | H03H 9/125 |
· · | Driving means, e.g. electrodes, coils [3]

|  | H03H 9/13 |
· · · | for networks consisting of piezo-electric or electrostrictive materials (Fulltext... Hierarchy... Expanded...H03H 9/145 takes precedence) [3]

|  | H03H 9/135 |
· · · | for networks consisting of magnetostrictive materials (Fulltext... Hierarchy... Expanded...H03H 9/145 takes precedence) [3]

|  | H03H 9/14 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/15, Fulltext... Hierarchy... Expanded...H03H 9/25 )

|  | H03H 9/145 |
· · · | for networks using surface acoustic waves [3]

|  | H03H 9/15 - H03H 9/76 |
Note(s) Groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03H 9/15-H03H 9/25 take precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03H 9/30-H03H 9/76. [3]

|  | H03H 9/15 |
· | Constructional features of resonators consisting of piezo-electric or electrostrictive material (Fulltext... Hierarchy... Expanded...H03H 9/25 takes precedence) [3]

|  | H03H 9/16 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/17, Fulltext... Hierarchy... Expanded...H03H 9/21 )

|  | H03H 9/17 |
· · | having a single resonator (crystal tuning forks Fulltext... Hierarchy... Expanded...H03H 9/21) [3]

|  | H03H 9/18 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/19, Fulltext... Hierarchy... Expanded...H03H 9/215 )

|  | H03H 9/19 |
· · · | consisting of quartz [3]

|  | H03H 9/20 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/205, Fulltext... Hierarchy... Expanded...H03H 9/21 )

|  | H03H 9/205 |
· · | having multiple resonators (crystal tuning forks Fulltext... Hierarchy... Expanded...H03H 9/21) [3]

|  | H03H 9/21 |
· · | Crystal tuning forks [3]

|  | H03H 9/215 |
· · · | consisting of quartz [3]

|  | H03H 9/22 |
· | Constructional features of resonators consisting of magnetostricitve material

|  | H03H 9/24 |
· | Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive

|  | H03H 9/25 |
· | Constructional features of resonators using surface acoustic waves [3]

|  | H03H 9/26 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/15, Fulltext... Hierarchy... Expanded...H03H 9/22, Fulltext... Hierarchy... Expanded...H03H 9/24, Fulltext... Hierarchy... Expanded...H03H 9/25, Fulltext... Hierarchy... Expanded...H03H 9/30, Fulltext... Hierarchy... Expanded...H03H 9/46, Fulltext... Hierarchy... Expanded...H03H 9/64, Fulltext... Hierarchy... Expanded...H03H 9/66, Fulltext... Hierarchy... Expanded...H03H 9/70 )

|  | H03H 9/28 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/46, Fulltext... Hierarchy... Expanded...H03H 9/64, Fulltext... Hierarchy... Expanded...H03H 9/66, Fulltext... Hierarchy... Expanded...H03H 9/70, covered by Fulltext... Hierarchy... Expanded...H03H 9/00 )

|  | H03H 9/30 |
· | Time-delay networks

|  | H03H 9/32 - H03H 9/34 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 9/30, Fulltext... Hierarchy... Expanded...H03H 9/46, Fulltext... Hierarchy... Expanded...H03H 9/66, Fulltext... Hierarchy... Expanded...H03H 9/70, Fulltext... Hierarchy... Expanded...H03H 9/74 )

|  | H03H 9/36 |
· · | with non-adjustable delay time (Fulltext... Hierarchy... Expanded...H03H 9/40, Fulltext... Hierarchy... Expanded...H03H 9/42 take precedence) [3]

|  | H03H 9/38 |
· · | with adjustable delay time (Fulltext... Hierarchy... Expanded...H03H 9/40, Fulltext... Hierarchy... Expanded...H03H 9/42 take precedence) [3]

|  | H03H 9/40 |
· · | Frequency-dependent delay lines, e.g. dispersive delay lines (Fulltext... Hierarchy... Expanded...H03H 9/42 takes precedence) [3]

|  | H03H 9/42 |
· · | using surface acoustic waves [3]

|  | H03H 9/44 |
· · · | Frequency-dependent delay lines, e.g. dispersive delay lines [3]

|  | H03H 9/46 |
· | Filters (multiple-port electromechanical filters Fulltext... Hierarchy... Expanded...H03H 9/70) [3]

|  | H03H 9/48 |
· · | Coupling means therefor [3]

|  | H03H 9/50 |
· · · | Mechanical coupling means [3]

|  | H03H 9/52 |
· · · | Electric coupling means [3]

|  | H03H 9/54 |
· · | comprising resonators of piezo-electric or electrostrictive material (Fulltext... Hierarchy... Expanded...H03H 9/64 takes precedence) [3]

|  | H03H 9/56 |
· · · | Monolithic crystal filters [3]

|  | H03H 9/58 |
· · · | Multiple crystal filters [3]

|  | H03H 9/60 |
· · · · | Electric coupling means therefor [3]

|  | H03H 9/62 |
· · | comprising resonators of magnetostrictive material (Fulltext... Hierarchy... Expanded...H03H 9/64 takes precedence) [3]

|  | H03H 9/64 |
· · | using surface acoustic waves [3]

|  | H03H 9/66 |
· | Phase shifters [3]

|  | H03H 9/68 |
· · | using surface acoustic waves [3]

|  | H03H 9/70 |
· | Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common or source [3]

|  | H03H 9/72 |
· · | Networks using surface acoustic waves [3]

|  | H03H 9/74 |
· | Multiple-port networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (networks for phase shifting Fulltext... Hierarchy... Expanded...H03H 9/66) [3]

|  | H03H 9/76 |
· · | Networks using surface acoustic waves [3]

|  | H03H 11/00 |
Networks using active elements

|  | H03H 11/02 |
· | Multiple-port networks [3]

|  | H03H 11/04 |
· · | Frequency selective two-port networks [3]

|  | H03H 11/06 |
· · · | comprising means for compensation of loss [3]

|  | H03H 11/08 |
· · · | using gyrators [3]

|  | H03H 11/10 |
· · · | using negative impedance converters (Fulltext... Hierarchy... Expanded...H03H 11/08 takes precedence) [3]

|  | H03H 11/12 |
· · · | using amplifiers with feedback (Fulltext... Hierarchy... Expanded...H03H 11/08, Fulltext... Hierarchy... Expanded...H03H 11/10 take precedence) [3]

|  | H03H 11/14 |
· · · | using electro-optic devices [3]

|  | H03H 11/16 |
· · | Networks for phase shifting [3]

|  | H03H 11/18 |
· · · | Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [3]

|  | H03H 11/20 |
· · · | Two-port phase shifters providing an adjustable phase shift [3]

|  | H03H 11/22 |
· · · | providing two or more phase shifted output signals, e.g. n-phase output [3]

|  | H03H 11/24 |
· · | Frequency-independent attenuators [3]

|  | H03H 11/26 |
· · | Time-delay networks (analogue shift registers Fulltext... Hierarchy... Expanded...G11C 27/00) [3]

|  | H03H 11/28 |
· · | Impedance matching networks [3]

|  | H03H 11/30 |
· · · | Automatic matching of source impedance to load impedance [3]

|  | H03H 11/32 |
· · | Balance-unbalance networks [3]

|  | H03H 11/34 |
· · | Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source (for use in multiplex transmission systems Fulltext... Hierarchy... Expanded...H04J 1/00) [3]

|  | H03H 11/36 |
· · | Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (phase shifters providing two or more output signals Fulltext... Hierarchy... Expanded...H03H 11/22) [3]

|  | H03H 11/38 |
· · | One-way transmission networks, i.e. unilines [3]

|  | H03H 11/40 |
· · | Impedance converters [3]

|  | H03H 11/42 |
· · · | Gyrators (used in frequency selective networks Fulltext... Hierarchy... Expanded...H03H 11/08) [3]

|  | H03H 11/44 |
· · · | Negative impedance converters (Fulltext... Hierarchy... Expanded...H03H 11/42 takes precedence; used in frequency-selective networks Fulltext... Hierarchy... Expanded...H03H 11/10) [3]

|  | H03H 11/46 |
· | One-port networks [3]

|  | H03H 11/48 |
· · | simulating reactances [3]

|  | H03H 11/50 |
· · · | using gyrators [3]

|  | H03H 11/52 |
· · | simulating negative resistances [3]

|  | H03H 11/54 |
· | Modifications of networks to reduce influence of variations of temperature [3]

|  | H03H 13/00 |
( transferred to Fulltext... Hierarchy... Expanded...H03H 1/00, Fulltext... Hierarchy... Expanded...H03H 5/00, Fulltext... Hierarchy... Expanded...H03H 7/00, Fulltext... Hierarchy... Expanded...H01P )

|  | H03H 15/00 |
Transversal filters (electromechanical filters Fulltext... Hierarchy... Expanded...H03H 9/46, Fulltext... Hierarchy... Expanded...H03H 9/70) [3]

|  | H03H 15/02 |
· | using analogue shift registers [3]

|  | H03H 17/00 |
Networks using digital techniques [3]

|  | H03H 17/02 |
· | Frequency-selective networks [3]

|  | H03H 17/04 |
· · | Recursive filters [3]

|  | H03H 17/06 |
· · | Non-recursive filters [3]

|  | H03H 17/08 |
· | Networks for phase-shifting [3]

|  | H03H 19/00 |
Networks using time-varying elements, e.g. N-path filters [3]

|  | H03H 21/00 |
Adaptive networks [3]