IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

Introduced: September 1968

Classification Context

Section:: ELECTRICITY
Class:: ELECTRONIC CIRCUITRY
Subclass:: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

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).

Scope Notes

Limiting references: Waveguides, resonators, lines or other devices of the waveguide type

Related Keywords

ATTENUATORSBAND(S) -pass filtersCIRCUITS for forming impedance networkselectric networks for electromagnetic COUPLING(S)DELAY networks or lines used in electronic circuitsFILTER(S) networksnetworks for FREQUENCY selectionlumped IMPEDANCE(S) networksnetworks for PHASE(S) shiftingresonant circuitsimpedance networks or resonators for TELECOMMUNICATIONTIME -domain networks

11 direct subcodes

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
H03H 11/00 Networks using active elements
H03H 15/00 Transversal filters
H03H 17/00 Networks using digital techniques
H03H 19/00 Networks using time-varying elements, e.g. N-path filters
H03H 2/00 Networks using elements or techniques not provided for in groups
H03H 21/00 Adaptive networks
H03H 3/00 Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
H03H 5/00 One-port networks comprising only passive electrical elements as network components
H03H 7/00 Multiple-port networks comprising only passive electrical elements as network components
H03H 9/00 Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators