H
SECTION H — ELECTRICITY
 H03
BASIC ELECTRONIC CIRCUITRY
 H03H
IMPEDANCE NETWORKS; RESONANT CIRCUITS; RESONATORS (measuring, testing G01R; impedance networks or resonators comprising of distributed impedance elements only i.e. of the waveguide type, H01P; networks specially designed for coupling between the active elements in an amplifier, e.g. wide-band coupling networks, H03F; networks for modifying the frequency characteristics of communication cables, e.g. equalising networks, H04B 3/14)
 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.

 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
 H03H 3/00
Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
 H03H 3/02
·  for the manufacture of piezo-electric or electrostrictive resonators
 H03H 3/04
·  ·  for obtaining desired frequency or temperature coefficient
 H03H 3/06
·  for the manufacture of magnetostrictive resonators
 H03H 5/00
One-port networks (comprising electromechanical devices H03H 9/00; networks simulating the impedance of a communication cable, e.g. for balancing purposes, H04B 3/00)
 H03H 5/02
·  with no voltage- or current-dependent elements
 H03H 5/04
·  ·  comprising only non-adjustable elements
 H03H 5/06
·  ·  ·  Resonant circuits, i.e. consisting of lumped inductance and capacitance
 H03H 5/08
·  ·  comprising at least one adjustable element (tuning of resonant circuits H03J)
 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 electromechanical devices H03H 9/00; comprising distributed impedance elements H03H 13/00; receiver input circuits H04B 1/18; networks simulating a length of communication cable H04B 3/40)
 H03H 7/02
·  Frequency-selective networks with non-adjustable characteristics
 H03H 7/04
·  ·  with only passive elements as essential network components
 H03H 7/06
·  ·  ·  with resistors and either capacitors or inductors
 H03H 7/08
·  ·  ·  Bandpass filters consisting of two or more coupled tuned circuits
 H03H 7/10
·  Frequency-selective networks with adjustable characteristics (automatic adjustment of filters H03G 5/16; tunable bandpass filters H03J)
 H03H 7/12
·  ·  Bandpass filters with adjustable bandwidth and fixed centre frequency (automatic bandwidth control in receivers H03G 5/16)
 H03H 7/14
·  Networks for modifying shape of frequency characteristics of a transmission path (tone control circuits H03G 5/00; for communication cables H04B 3/14)
 H03H 7/16
·  ·  the network being continuously adjustable
 H03H 7/18
·  Networks for phase shifting
 H03H 7/20
·  ·  continuously adjustable
 H03H 7/22
·  ·  ·  with provision for adjusting the attenuation also
 H03H 7/24
·  Frequency-independent attenuators
 H03H 7/26
·  ·  comprising resistors only
 H03H 7/28
·  Time domain networks, i.e. networks having an impulse response which approximates a prescribed function of time, e.g. matched filter
 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
·  ·  with delay time continuously adjustable
 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
·  Networks comprising gyrators
 H03H 7/46
·  Networks for connecting several sources or loads, working on different frequencies, 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 to a common load or source (hybrid circuits for two-way transmission H04B)
 H03H 7/50
·  ·  for obtaining two output voltages having a phase difference substantially independent of frequency
 H03H 7/52
·  One-way transmission networks (H03H 7/44 takes precedence)
 H03H 9/00
Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators (H03H 13/00 takes precedence; making crystals B01J 17/00; selection of materials thereof H01V; electromechanical transducers H04R)
 H03H 9/02
·  Details of resonators
 H03H 9/04
·  ·  Holders; Driving means, e.g. electrodes, coils; Supports
 H03H 9/06
·  ·  ·  Adjustable, elastic, or damping electrodes or supporting means
 H03H 9/08
·  ·  ·  Holders with means for regulating temperature
 H03H 9/10
·  ·  ·  Mounting resonators in sealed enclosures
 H03H 9/12
·  ·  ·  ·  for luminous resonators
 H03H 9/14
·  Constructions of single resonators consisting of piezo-electric or electrostrictive material
 H03H 9/16
·  ·  with two electrodes
 H03H 9/18
·  ·  ·  consisting of quartz
 H03H 9/20
·  ·  with more than two electrodes
 H03H 9/22
·  Constructions of single resonators consisting of magnetostrictive material
 H03H 9/24
·  Constructions of single resonators, consisting wholly or partially of material which is not piezo-electric, electrostrictive, or magnetostrictive
 H03H 9/26
·  Structural combinations of mechanically coupled resonators
 H03H 9/28
·  ·  Combinations of a piezo-electric or electrostrictive resonator and a magnetostrictive resonator
 H03H 9/30
·  Constructions of delay lines
 H03H 9/32
·  Networks comprising piezo-electric or electrostrictive resonators and no other resonators
 H03H 9/34
·  Networks comprising magnetostrictive resonators and no other resonators
 H03H 11/00
Networks simulating reactances and comprising discharge tubes or semiconductor devices
 H03H 13/00
Networks comprising distributed impedance elements, e.g. cavity resonators, together with lumped impedance elements (time-delay networks H03H 7/30)