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IPC 7
H03H-H03H02100

SECTION H – ELECTRICITY


H 03BASIC ELECTRONIC CIRCUITRY


H 03 HIMPEDANCE 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 



1/

00Constructional 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)

1/

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


2/

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


3/

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

3/

007.for the manufacture of electromechanical resonators or networks  [3]

3/

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

3/

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

3/

04...for obtaining desired frequency or temperature coefficient  [3]

3/

06..for the manufacture of magnetostrictive resonators or networks  [3]

3/

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

3/

10...for obtaining desired frequency or temperature coefficient  [3]


5/

00One-port networks comprising only passive electrical elements as network components  [3]

5/

02.without voltage- or current-dependent elements

5/

10..comprising at least one element with prescribed temperature coefficient

5/

12.with at least one voltage- or current-dependent element


7/

00Multiple-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]

7/

01.Frequency selective two-port networks  [3]

7/

03..comprising means for compensation of loss  [3]

7/

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

7/

065...Parallel T-filters  [3]

7/

07...Bridged T-filters  [3]

7/

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

7/

09..Filters comprising mutual inductance  [3]

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)

7/

13..using electro-optical elements  [3]

7/

18.Networks for phase shifting

7/

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

7/

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

7/

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

7/

24.Frequency-independent attenuators

7/

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

7/

27..comprising a photo-electric element  [3]

7/

30.Time-delay networks

7/

32..with lumped inductance and capacitance

7/

34..with lumped and distributed reactance

7/

38.Impedance-matching networks

7/

40..Automatic matching of load impedance to source impedance

7/

42.Balance/unbalance networks

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)

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)  [3]

7/

52.One-way transmission networks, i.e. unilines

7/

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


9/

00Networks 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)

9/

02.Details  [3]

9/

05..Holders; Supports  [3]

9/

08...Holders with means for regulating temperature

9/

09...Elastic or damping supports  [3]

9/

10...Mounting in enclosures

9/

12....for networks with interaction of optical and acoustic waves

9/

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

9/

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

9/

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

9/

145...for networks using surface acoustic waves  [3]

9/

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

9/

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

9/

19...consisting of quartz  [3]

9/

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

9/

21..Crystal tuning forks  [3]

9/

215...consisting of quartz  [3]

9/

22.Constructional features of resonators consisting of magnetostricitve material

9/

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

9/

25.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]

9/

30.Time-delay networks

9/

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

9/

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

9/

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

9/

42..using surface acoustic waves  [3]

9/

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

9/

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

9/

48..Coupling means therefor  [3]

9/

50...Mechanical coupling means  [3]

9/

52...Electric coupling means  [3]

9/

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

9/

56...Monolithic crystal filters  [3]

9/

58...Multiple crystal filters  [3]

9/

60....Electric coupling means therefor  [3]

9/

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

9/

64..using surface acoustic waves  [3]

9/

66.Phase shifters  [3]

9/

68..using surface acoustic waves  [3]

9/

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

9/

72..Networks using surface acoustic waves  [3]

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]

9/

76..Networks using surface acoustic waves  [3]


11/

00Networks using active elements

11/

02.Multiple-port networks  [3]

11/

04..Frequency selective two-port networks  [3]

11/

06...comprising means for compensation of loss  [3]

11/

08...using gyrators  [3]

11/

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

11/

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

11/

14...using electro-optical devices  [3]

11/

16..Networks for phase shifting  [3]

11/

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

11/

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

11/

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

11/

24..Frequency-independent attenuators  [3]

11/

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

11/

28..Impedance matching networks  [3]

11/

30...Automatic matching of source impedance to load impedance  [3]

11/

32..Balance-unbalance networks  [3]

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]

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]

11/

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

11/

40..Impedance converters  [3]

11/

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

11/

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

11/

46.One-port networks  [3]

11/

48..simulating reactances  [3]

11/

50...using gyrators  [3]

11/

52..simulating negative resistances  [3]

11/

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


15/

00Transversal filters (electromechanical filters H03H 9/46, H03H 9/70) [3]

15/

02.using analogue shift registers  [3]


17/

00Networks using digital techniques  [3]

17/

02.Frequency-selective networks  [3]

17/

04..Recursive filters  [3]

17/

06..Non-recursive filters  [3]

17/

08.Networks for phase-shifting  [3]


19/

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


21/

00Adaptive networks  [3]


  
 

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