IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

Introduced: September 1968

Description

H03H covers impedance networks and resonant circuits, including devices that manipulate electrical impedance, filter signals, and resonate at specific frequencies. This subclass encompasses passive and active filter designs, LC circuits, crystal and mechanical resonators, and impedance matching networks used across analog and RF applications. The classification includes both lumped-element circuits and distributed-parameter networks designed for frequency-selective behavior. Related signal processing and modulation techniques are typically classified elsewhere in H03 (e.g., H03D for demodulation or H03L for oscillators).

Title

Titles differ between systems:

IPC: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

CPC: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

Full Title

Full titles differ between systems:

IPC:

IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

CPC:

IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

Of 18 combined children, 11 exist in both systems.

7 codes are CPC-only extensions.

Note: 7 CPC extensions are marked as secondary classification only.

4 shared codes have differing titles between IPC and CPC.

Child Classifications

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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 H03H9/00) +4 CPC IPC+CPC Available in IPC and CPC
H03H 11/00 Networks using active elements IPC+CPC Available in IPC and CPC
H03H 15/00 Transversal filters (electromechanical filters H03H9/46, H03H9/70) since 1980 +4 CPC IPC+CPC Available in IPC and CPC
H03H 17/00 Networks using digital techniques since 1980 +5 CPC IPC+CPC Available in IPC and CPC
H03H 19/00 Networks using time-varying elements, e.g. N-path filters since 1980 +3 CPC IPC+CPC Available in IPC and CPC
H03H 2/00 Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00 since 1980 +3 CPC IPC+CPC Available in IPC and CPC
H03H 21/00 Adaptive networks since 1980 +3 CPC IPC+CPC Available in IPC and CPC
H03H 2210/00 Indexing scheme relating to details of tunable filters 2nd only +4 CPC CPC only CPC only
H03H 2218/00 Indexing scheme relating to details of digital filters 2nd only +7 CPC CPC only CPC only
H03H 2220/00 Indexing scheme relating to structures of digital filters 2nd only +4 CPC CPC only CPC only
H03H 2222/00 Indexing scheme relating to digital filtering methods 2nd only +3 CPC CPC only CPC only
H03H 2240/00 Indexing scheme relating to filter banks 2nd only CPC only CPC only
H03H 2250/00 Indexing scheme relating to dual- or multi-band filters 2nd only CPC only CPC only
H03H 2260/00 Theory relating to impedance networks 2nd only CPC only CPC only
H03H 3/00 Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators IPC+CPC Available in IPC and CPC
H03H 5/00 One-port networks comprising only passive electrical elements as network components +2 CPC IPC+CPC Available in IPC and CPC
H03H 7/00 Multiple-port networks comprising only passive electrical elements as network components +3 CPC IPC+CPC Available in IPC and CPC
H03H 9/00 Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (electro-acoustic transducers such as loudspeakers, microphones or gramophone pick-ups H04R; piezoelectric, electrostrictive or magnetostrictive devices with mechanical input or output, e.g. actuators or sensors, H10N30/00, H10N35/00) +3 CPC IPC+CPC Available in IPC and CPC