IPC 7 English version H03H !A-H03H 21/00

H03H-H03H02100

SECTION H – ELECTRICITY

H 03

BASIC ELECTRONIC CIRCUITRY

H 03 H

IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08; 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)

Notes

(1)

This subclass covers:

–

networks comprising lumped impedance elements;

–

networks comprising distributed impedance elements together with lumped impedance elements;

–

networks comprising electromechanical or electro-acoustic elements;

–

networks simulating reactances and comprising discharge tubes or semiconductor devices;

–

constructions of electromechanical resonators.

(2)

In this subclass, the following expression is used with the meaning indicated:

–

"passive elements" means resistors, capacitors, inductors, mutual inductors, or diodes. [3]

(3)

Attention is drawn to the Notes following the titles of class B81 and subclass B81B relating to "micro-structural devices" and "micro-structural systems". [7]

(4)

In this subclass, main groups with a higher number take precedence. [3]

Subclass Index

NETWORKS

Adaptive

H03H 21/00

Using digital techniques

H03H 17/00

Transversal filters

H03H 15/00

Using passive elements only:

one port; multi-port

H03H 5/00; H03H 7/00

Using electromechanical or electro-acoustical elements

H03H 9/00

Using active elements

H03H 11/00

Using time varying elements

H03H 19/00

Using other elements or techniques

H03H 2/00

DETAILS

H03H 1/00

MANUFACTURE

H03H 3/00

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)

RC networks, e.g. filters (structural combinations of capacitors with other electric elements H01G) [3]

Networks using elements or techniques not provided for in groups H03H 3/00 to H03H 21/00 [3]

Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators

007

for the manufacture of electromechanical resonators or networks [3]

013

for obtaining desired frequency or temperature coefficient (H03H 3/04, H03H 3/10 take precedence) [3]

for the manufacture of piezo-electric or electrostrictive resonators or networks (H03H 3/08 takes precedence) [3]

for obtaining desired frequency or temperature coefficient [3]

for the manufacture of magnetostrictive resonators or networks [3]

for the manufacture of resonators or networks using surface acoustic waves [3]

for obtaining desired frequency or temperature coefficient [3]

One-port networks comprising only passive electrical elements as network components [3]

without voltage- or current-dependent elements

comprising at least one element with prescribed temperature coefficient

with at least one voltage- or current-dependent element

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) [3]

Frequency selective two-port networks [3]

comprising means for compensation of loss [3]

including resistors (H03H 7/075, H03H 7/09, H03H 7/12, H03H 7/13 take precedence) [3]

065

Parallel T-filters [3]

Bridged T-filters [3]

075

Ladder networks, e.g. electric wave filters [3]

Filters comprising mutual inductance [3]

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)

using electro-optical elements [3]

Networks for phase shifting

Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [3]

Two-port phase shifters providing an adjustable phase shift [3]

providing two or more phase shifted output signals, e.g. n-phase output [3]

Frequency-independent attenuators

comprising an element controlled by an electric or magnetic variable (H03H 7/27 takes precedence) [3]

comprising a photo-electric element [3]

Time-delay networks

with lumped inductance and capacitance

with lumped and distributed reactance

Impedance-matching networks

Automatic matching of load impedance to source impedance

Balance/unbalance networks

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)

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) [3]

One-way transmission networks, i.e. unilines

Modifications of networks to reduce influence of variations of temperature [3]

Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (manufacture of piezo-electric or magnetostrictive elements H01L 41/00; loudspeakers, microphones, gramophone pick-ups or the like H04R)

Details [3]

Holders; Supports [3]

Holders with means for regulating temperature

Elastic or damping supports [3]

Mounting in enclosures

for networks with interaction of optical and acoustic waves

125

Driving means, e.g. electrodes, coils [3]

for networks consisting of piezo-electric or electrostrictive materials (H03H 9/145 takes precedence) [3]

135

for networks consisting of magnetostrictive materials (H03H 9/145 takes precedence) [3]

145

for networks using surface acoustic waves [3]

Constructional features of resonators consisting of piezo-electric or electrostrictive material (H03H 9/25 takes precedence) [3]

having a single resonator (crystal tuning forks H03H 9/21) [3]

consisting of quartz [3]

205

having multiple resonators (crystal tuning forks H03H 9/21) [3]

Crystal tuning forks [3]

215

consisting of quartz [3]

Constructional features of resonators consisting of magnetostricitve material

Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive

Constructional features of resonators using surface acoustic waves [3]

Note

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

Time-delay networks

with non-adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [3]

with adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [3]

Frequency-dependent delay lines, e.g. dispersive delay lines (H03H 9/42 takes precedence) [3]

using surface acoustic waves [3]

Frequency-dependent delay lines, e.g. dispersive delay lines [3]

Filters (multiple-port electromechanical filters H03H 9/70) [3]

Coupling means therefor [3]

Mechanical coupling means [3]

Electric coupling means [3]

comprising resonators of piezo-electric or electrostrictive material (H03H 9/64 takes precedence) [3]

Monolithic crystal filters [3]

Multiple crystal filters [3]

Electric coupling means therefor [3]

comprising resonators of magnetostrictive material (H03H 9/64 takes precedence) [3]

using surface acoustic waves [3]

Phase shifters [3]

using surface acoustic waves [3]

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

Networks using surface acoustic waves [3]

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]

Networks using surface acoustic waves [3]

11/

Networks using active elements

11/

Multiple-port networks [3]

11/

Frequency selective two-port networks [3]

11/

comprising means for compensation of loss [3]

11/

using gyrators [3]

11/

using negative impedance converters (H03H 11/08 takes precedence) [3]

11/

using amplifiers with feedback (H03H 11/08, H03H 11/10 take precedence) [3]

11/

using electro-optical devices [3]

11/

Networks for phase shifting [3]

11/

Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [3]

11/

Two-port phase shifters providing an adjustable phase shift [3]

11/

providing two or more phase shifted output signals, e.g. n-phase output [3]

11/

Frequency-independent attenuators [3]

11/

Time-delay networks (analogue shift registers G11C 27/04) [3]

11/

Impedance matching networks [3]

11/

Automatic matching of source impedance to load impedance [3]

11/

Balance-unbalance networks [3]

11/

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]

11/

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]

11/

One-way transmission networks, i.e. unilines [3]

11/

Impedance converters [3]

11/

Gyrators (used in frequency selective networks H03H 11/08) [3]

11/

Negative impedance converters (H03H 11/42 takes precedence; used in frequency-selective networks H03H 11/10) [3]

11/

One-port networks [3]

11/

simulating reactances [3]

11/

using gyrators [3]

11/

simulating negative resistances [3]

11/

Modifications of networks to reduce influence of variations of temperature [3]

15/

Transversal filters (electromechanical filters H03H 9/46, H03H 9/70) [3]

15/

using analogue shift registers [3]

17/

Networks using digital techniques [3]

17/

Frequency-selective networks [3]

17/

Recursive filters [3]

17/

Non-recursive filters [3]

17/

Networks for phase-shifting [3]

19/

Networks using time-varying elements, e.g. N-path filters [3]

21/

Adaptive networks [3]