DIFF Main Group
H01Q 21/00 Antenna arrays or systems (arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Antenna arrays or systems
CPC: Antenna arrays or systems (arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00)
Full Title
Full titles differ between systems:
IPC:
Antenna arrays or systems
CPC:
Antenna arrays or systems (arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00)
Of 7 combined children, 5 exist in both systems.
2 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H01Q 21/06 Arrays of individually energised antenna units similarly polarised and spaced apart +1 CPC IPC+CPC Available in IPC and CPC
- H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction +1 CPC IPC+CPC Available in IPC and CPC
- H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems IPC+CPC Available in IPC and CPC
- H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic (H01Q25/00 takes precedence) since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system IPC+CPC Available in IPC and CPC