TWO-BAND IRRADIATOR WITH COMBINED MODAL CONVERTER Russian patent published in 2019 - IPC H01Q5/00 

FIELD: antenna equipment.

SUBSTANCE: invention relates to the antenna equipment. Irradiator consists of three parts: the horn, the modal transducer and the exciter, in which the horn consists of a conical section with a regular corrugated surface formed by alternating grooves of different depths, h₀ and H₀, and the adjacent radial section with a corrugated surface formed by alternating grooves with a constant depth h₀ and with variable depth H, the width s and the period of alternation of the grooves w are constant, and the modal converter is made in the form of a corrugated conical section with an extension angle β=4°, which has 2N+1 grooves of various configurations: N+1 grooves have width s, alternation period w and depth h₀, and located between them N grooves with a period of alternation w have a variable step-section depth H_M with a constant ratio of the depth of the inner steps to the depth of the outer 1:2. Excitation device is a waveguide structure that includes a corrugated waveguide consisting of a conical and cylindrical sections, while the conical section begins with a circular waveguide, which is a high frequency port, and contains on the side surface diametrically located rectangular waveguides with low-pass filters, which are connected to a summing device, forming a low-frequency port, and connected to a corrugated waveguide with longitudinal slits, and the surface of the corrugated waveguide is formed by grooves of width s, alternation period 0.5 w and depth h₀, except for the first G grooves, which have a variable depth.

EFFECT: technical result consists in the possibility of combining two frequency bands, in expanding the working frequency bandwidth and in expanding the level of cross-polarization radiation.

1 cl, 5 dwg