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)

Child Classifications

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• H01Q 21/0006 +6 CPC CPC only CPC only
• H01Q 21/0087 +1 CPC CPC only CPC only
• 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