FREQUENCY-INDEPENDENT ACTIVE MULTI-BEAM ANTENNA ARRAY Russian patent published in 2021 - IPC H01Q21/00 

FIELD: antenna equipment.

SUBSTANCE: invention relates to antenna engineering, particularly to UHF antenna arrays, and can be used as a transmitting or receiving multibeam antenna for broadband radar, radio monitoring and communication. Technical result is achieved by the fact that in frequency-independent active multi-beam antenna array, including diagram-forming device (BF), having P input channels, which number is equal to the number of generated beams within the MAA angular sector of operation, and N output channels, to which N transmission lines are connected, the lengths of which increase from the central outputs BF to the outermost ones, as well as N single-type power amplifiers, outputs connected to N emitters, in contrast to prototype as transmission lines used radio-frequency cables, connected to inputs of single-type power amplifiers tuned to mode of maximum output power for excitation with equal amplitude of emitters, which are arranged with variable pitch between each other with increase in interval to grid opening periphery, wherein coordinate ξ_m relative to opening middle for emitter with index m is defined by formula

where ξ_m is radiator coordinate with index m (m=-n...n; n=N/2) relative to opening center, L is MAA opening length, and electric lengths of radio-frequency cables connecting outputs BF with inputs of amplifiers are selected in accordance with formula Δl_m=0.278λ_l(ξ_m/ξ_n)^2.2, where Δl_m is increment of electric length of radio-frequency cable of amplifier with index m, exciting radiator with coordinate ξ_m, ξ_n is coordinate of extreme radiator MAA, λ_l is wavelength in free space at lower boundary of operating frequency band.

EFFECT: technical result of the proposed invention is generation of frequency-independent BP partial beams at equal excitation of emitters and expansion of working frequency band of active linear multibeam antenna arrays (MAA).

1 cl, 5 dwg