CPC Subgroup
H01P 1/20 Frequency-selective devices, e.g. filters
Full Title
Auxiliary devices (coupling devices of the waveguide type H01P5/00) > Frequency-selective devices, e.g. filters
9 direct subcodes
Child Classifications
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- H01P 1/201 Filters for transverse electromagnetic waves (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence)
- H01P 1/207 Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence)
- H01P 1/212 suppressing or attenuating harmonic frequencies (H01P1/215 takes precedence)
- H01P 1/213 combining or separating two or more different frequencies (H01P1/215 takes precedence)
- H01P 1/215 using ferromagnetic material
- H01P 1/219 Evanescent mode filters