ANNULAR SLIT ANTENNA Russian patent published in 2016 - IPC H01Q13/10 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to antenna technology. Annular slit antenna comprises coaxially arranged hollow metal inner and outer cylinders, conducting ring, first and second coaxial connectors, first and second feed points, first and second conducting pins. Conductive ring connects cylinders and is installed on side of open end of inner cylinder in cavity formed between outer and inner cylinders. Feed points are located on inner side surface of inner cylinder. Second feed point is radially displaced relative to first feed point by 90°. First feed point is connected to first coaxial connector, centre conductor of which is extended in formed cavity and is connected to external cylinder. Second feed point is connected to second coaxial connector. Conducting pins are installed in formed cavity and outer and inner cylinders are connected, respectively. Connection points of first and second pins with cylinders are located diametrically opposite first and second feed points, respectively. Antenna is configured for separation of working channels on polarisation with isolation between feed points of 20 dB.

EFFECT: enabling simultaneous operation in two frequency bands.

1 cl, 2 dwg