Integrated substrate gap waveguide four-arm circularly polarized antenna

Abstract

The invention discloses an integrated substrate gap waveguide four-arm circularly polarized antenna, which comprises an upper dielectric plate, a lower dielectric plate and a spacing dielectric plate,wherein a first copper-clad layer is printed on the upper surface of the upper dielectric plate; a gap is formed in the first copper-clad layer; the lower surface of the upper dielectric plate is printed with a feed microstrip line, a quarter-wavelength impedance converter and a three-fourths-wavelength impedance matching line which are connected in sequence; the impedance matching line is bent into a ring shape from outside to inside; four antenna arms which are perpendicular to each other and are spaced by a quarter of wavelength are arranged on the impedance matching line; an impedance matching patch which is arranged opposite to the impedance converter and has the same size and an annular patch which is arranged opposite to the impedance matching line and has the same size are arranged in the gap; a second copper-clad layer is printed on the lower surface of the lower dielectric plate, round metal patches which are arranged periodically are printed on the upper surface of the lower dielectric plate, and a metal via hole is formed in each round metal patch. The antenna structure can be simplified, the antenna gain and the bandwidth are improved, and the axial ratio bandwidth performance is improved.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an integrated substrate gap waveguide four-arm circularly polarized antenna. Background technique [0002] Due to its good compatibility and anti-interference ability, circularly polarized antennas are widely used in many different scenarios such as navigation satellites, radars, and mobile communications. At present, circularly polarized antennas in the millimeter wave band are roughly divided into microstrip circularly polarized antennas, metallic rectangular waveguide (RW) circularly polarized antennas, and substrate integrated waveguide (SIW) circularly polarized antennas. At present, there are some problems in the traditional circularly polarized antennas in the millimeter wave band, such as: the pure metal structure is difficult to manufacture in the millimeter wave band, the electromagnetic shielding performance of the substrate integrated waveguide (SIW) is not strong, a...

AI Technical Summary

Problems solved by technology

However, since the microstrip line and the mushroom structure in the ridged ISGW are on the same PCB board, the microstrip line will be restricted by the mushroom structure and not convenient for routing, which has limitations in practical applications.

Images