(0)H03H:0/2:
IPC6
SECTION H - ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H
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H 03 H

 IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G 01 R; arrangements for producing a reverberation or echo sound G 10 K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H 01 P; control of amplification, e.g. bandwidth control of amplifiers, H 03 G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H 03 J; networks for modifying the frequency characteristics of communication systems H 04 B)
 

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)

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

 

 

 
 

 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 H 03 H 9/00)

1
/ 02 • RC networks, e.g. filters (structural combinations of capacitors with other electric elements H 01 G) [3]  
 

 2
/ 00 Networks using elements or techniques not provided for in groups H 03 H 3/00 to H 03 H 21/00 [3]
 

 3
/ 00 Apparatus 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 (H 03 H 3/04, H 03 H 3/10 take precedence) [3]  

3
/ 02 • • for the manufacture of piezo-electric or electrostrictive resonators or networks (H 03 H 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
/ 00 One-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
/ 00 Multiple-port networks comprising only passive electrical elements as network components (receiver input circuits H 04 B 1/18; networks simulating a length of communication cable H 04 B 3/40) [3]

7
/ 01 • Frequency selective two-port networks [3]  

7
/ 03 • • comprising means for compensation of loss [3]  

7
/ 06 • • including resistors (H 03 H 7/075, H 03 H 7/09, H 03 H 7/12, H 03 H 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 (H 03 H 7/09 takes precedence; automatic control of bandwidth in amplifiers H 03 G 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 (H 03 H 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 H 04 J 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 H 03 H 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]  
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