ANTENNA-FILTER Russian patent published in 2012 - IPC H01Q9/04 

FIELD: radio engineering.

SUBSTANCE: antenna filter comprises an additional strip-line resonator, an element of connection of the additional strip-line resonator with a radiator and a quadrature summator of power, the additional strip-line resonator and the element of connection of the additional strip-line resonator with the radiator are made identical to the main strip-line resonator and the element of connection of the main strip-line resonator with the radiator, elements of connection of the main and additional strip-line resonators with the radiator are made in the form of metal conductors arranged perpendicularly to a metal screen, besides, the metal conductor of the element of connection of the main strip-line resonator with the radiator has an electric contact with the conductor of the main strip-line resonator, and the metal conductor of the element of connection of the additional strip-line resonator with the radiator has an electric contact with the conductor of the additional strip-line radiator, the specified metal conductors are submerged inside the radiator via holes made in the metal screen, the strip-line conductor of the radiator is made in the form having symmetry of a turn by ninety degrees, relative to the axis perpendicular to the strip-line conductor and passing through its centre, and axes of metal conductors of the elements of connection of the main and additional strip-line resonators with the radiator are arranged at the same distance from the centre of the strip-line conductor and the radiator, besides the lines connecting the centre of the strip-line conductor of the radiator with axes of metal conductors of the elements of connection of the main and additional strip-line resonators with the radiator form a right angle, inputs of the quadrature summator of power are connected with conductors of the main and additional strip-line resonators in points arranged at the same distance from the ends of the specified conductors. The main and additional strip-line resonators are made with strip-line conductors shortened at one end.

EFFECT: increased squareness of a frequency characteristic of an amplification ratio of the antenna filter and increased ratio of antenna filter ellipticity to the values providing for efficient reception and transmission of circular polarisation waves.

2 cl, 10 dwg