DIFF Subgroup
H01P 3/12 Hollow waveguides (H01P3/20 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Hollow waveguides
CPC: Hollow waveguides (H01P3/20 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Waveguides; Transmission lines of the waveguide type > Hollow waveguides
CPC:
Waveguides; Transmission lines of the waveguide type > Hollow waveguides (H01P3/20 takes precedence)
Of 6 combined children, 4 exist in both systems.
2 codes are CPC-only extensions.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H01P 3/123 with a complex or stepped cross-section, e.g. ridged or grooved waveguides (H01P3/14 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
- H01P 3/127 with a circular, elliptic, or parabolic cross-section since 1980 IPC+CPC Available in IPC and CPC
- H01P 3/13 specially adapted for transmission of the TE01 circular-electric mode since 1974 IPC+CPC Available in IPC and CPC