IPC Main Group
H01Q 3/00 Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ANTENNAS, i.e. RADIO AERIALS
Related Keywords
antenna systems for SCANNING
7 direct subcodes
Child Classifications
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- H01Q 3/01 varying the shape of the antenna or antenna system
- H01Q 3/02 using mechanical movement of antenna or antenna system as a whole
- H01Q 3/12 using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
- H01Q 3/22 varying the orientation in accordance with variation of frequency of radiated wave
- H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element