SMALL LOOP ANTENNA Russian patent published in 2022 - IPC H01Q9/04 

FIELD: antennas.

SUBSTANCE: invention relates to a small loop antenna. The antenna contains: a rectangular metal frame, an output coaxial cable, a frame tuning capacitor, a matching device and a metal screen. A gap is made in one of the end sides of the rectangular metal frame. The tuning capacitor of the frame is included in the gap. The tuning capacitor of the frame is made with the first and second plates. The matching device is made in the form of a resonator. The metal screen is installed parallel to the plane of the rectangular metal frame. The end side of the rectangular metal frame, opposite the end side with a gap, is electrically connected to the metal screen by means of a metal jumper. The resonator is made in the form of a piece of coaxial cable and a tuning capacitor of the matching device. The tuning capacitor is installed between the ends of the inner conductor of the coaxial cable segment. The outer conductor of the coaxial cable is electrically connected to the metal shield. The frame and the matching device are connected through two coupling capacitors. One capacitor is installed between the first plate of the tuning capacitor of the frame and the first plate of the tuning capacitor of the matching device. The second capacitor is installed between the second plate of the frame tuning capacitor and the second plate of the tuning capacitor of the matching device. An output coaxial cable is connected in parallel to a piece of coaxial cable at a distance less than half of its length.

EFFECT: antenna is protected from lightning strikes.

3 cl, 9 dwg