H
SECTION H — ELECTRICITY
 H03
BASIC ELECTRONIC CIRCUITRY
 H03H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G01R; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B)
 H03H

Note(s)

  1. 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.
  2. In this sub-class, the term "passive elements" refers to resistors, capacitors, inductors, mutual inductors, or diodes. [3]
  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 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 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 (H03H 3/04, H03H 3/10 take precedence)  [3]
 H03H 3/02
·  ·  for the manufacture of piezo-electric or electrostrictive resonators or networks (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 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 H04B 1/18; networks simulating a length of communication cable H04B 3/40)
 H03H 7/01
·  frequency selective two-port networks  [3]
 H03H 7/02
( transferred to H03H 7/01, covered by H03H 7/00 )
 H03H 7/03
·  ·  comprising means for compensation of loss  [3]
 H03H 7/04
( transferred to H03H 7/01 )
 H03H 7/06
·  ·  including resistors (H03H 7/075, H03H 7/09, H03H 7/12, 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 H03H 7/01, H03H 7/09 )
 H03H 7/09
·  ·  Filters comprising mutual inductance  [3]
 H03H 7/10
( transferred to H03H 7/01 )
 H03H 7/12
·  ·  Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency (H03H 7/09 takes precedence; automatic control of bandwidth in amplifiers H03G 5/16)
 H03H 7/13
·  ·  using electro-optic elements  [3]
 H03H 7/14 - 
H03H 7/16
( transferred to 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 H03H 7/19, H03H 7/21, covered by H03H 7/18, H03H 7/20 )
 H03H 7/24
·  Frequency-independent attenuators
 H03H 7/25
·  ·  comprising an element controlled by an electric or magnetic variable (H03H 7/27 takes precedence)  [3]
 H03H 7/26
( covered by H03H 7/24 )
 H03H 7/27
·  ·  comprising a photo-electric element  [3]
 H03H 7/28
( transferred to 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 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 H03H 11/08, H03H 11/42, 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 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 H03H 7/21)
 H03H 7/50
( transferred to 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 C30B; selection of materials thereof H01L; piezo-electric, electrostrictive or magnetostrictive devices in general H01L 41/00; electromechanical transducers H04R)
 H03H 9/02
·  Details
 H03H 9/04
( transferred to H03H 9/05, H03H 9/125 )
 H03H 9/05
·  ·  Holders; Supports  [3]
 H03H 9/06
( transferred to H03H 9/09, 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 (H03H 9/145 takes precedence)  [3]
 H03H 9/135
·  ·  ·  for networks consisting of magnetostrictive materials (H03H 9/145 takes precedence)  [3]
 H03H 9/14
( transferred to H03H 9/15, H03H 9/25 )
 H03H 9/145
·  ·  ·  for networks using surface acoustic waves  [3]
 H03H 9/15 - 
H03H 9/76

Note(s)

Groups H03H 9/15-H03H 9/25 take precedence over groups H03H 9/30-H03H 9/76[3]

 H03H 9/15
·  Constructional features of resonators consisting of piezo-electric or electrostrictive material (H03H 9/25 takes precedence)  [3]
 H03H 9/16
( transferred to H03H 9/17, H03H 9/21 )
 H03H 9/17
·  ·  having a single resonator (crystal tuning forks H03H 9/21)  [3]
 H03H 9/18
( transferred to H03H 9/19, H03H 9/215 )
 H03H 9/19
·  ·  ·  consisting of quartz  [3]
 H03H 9/20
( transferred to H03H 9/205, H03H 9/21 )
 H03H 9/205
·  ·  having multiple resonators (crystal tuning forks 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 H03H 9/15, H03H 9/22, H03H 9/24, H03H 9/25, H03H 9/30, H03H 9/46, H03H 9/64, H03H 9/66, H03H 9/70 )
 H03H 9/28
( transferred to H03H 9/46, H03H 9/64, H03H 9/66, H03H 9/70, covered by H03H 9/00 )
 H03H 9/30
·  Time-delay networks
 H03H 9/32 - 
H03H 9/34
( transferred to H03H 9/30, H03H 9/46, H03H 9/66, H03H 9/70, H03H 9/74 )
 H03H 9/36
·  ·  with non-adjustable delay time (H03H 9/40, H03H 9/42 take precedence)  [3]
 H03H 9/38
·  ·  with adjustable delay time (H03H 9/40, H03H 9/42 take precedence)  [3]
 H03H 9/40
·  ·  Frequency-dependent delay lines, e.g. dispersive delay lines (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 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 (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 (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 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 (H03H 11/08 takes precedence)  [3]
 H03H 11/12
·  ·  ·  using amplifiers with feedback (H03H 11/08, 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 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 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 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 H03H 11/08)  [3]
 H03H 11/44
·  ·  ·  Negative impedance converters (H03H 11/42 takes precedence; used in frequency-selective networks 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 H03H 1/00, H03H 5/00, H03H 7/00, H01P )
 H03H 15/00
Transversal filters (electromechanical filters H03H 9/46, 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]