DIFF Subgroup
H01Q 11/08 Helical antennas
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements > Non-resonant antennas, e.g. travelling-wave antenna > Helical antennas
CPC:
Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements (leaky waveguides antennas or slot antennas H01Q13/00) > Non-resonant antennas, e.g. travelling-wave antenna (Yagi antennas H01Q19/30) > Helical antennas
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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