Gate slot ground coplanar waveguide feed low resistance sidewall stepped-impedance tri-polarized slot antenna

Abstract

The invention relates to a slot antenna and particularly relates to a gate slot ground coplanar waveguide feed low resistance sidewall stepped-impedance tri-polarized slot antenna. The tri-polarized slot antenna comprises three single-polarized antennas (13) which are perpendicular to each other, each antenna (13) comprises a medium substrate (1), and a metal ground (2) and a radiation slot (3) which are on the medium substrate (1), and a coplanar waveguide feeder (4), wherein the radiation slot (3) and multiple parallel gate slots (6) are on the metal ground (2), two ends of the radiation slot (3) are in short circuit, the middle portion of the radiation slot (3) is provided with two metalized side walls (7) which form a low-resistance slot (8), the other portion of the radiation slot (3) is a high-resistance slot (9), an outer conductor (5) of the coplanar waveguide feeder (4) is connected with the metal ground (2), and an inner conductor (12) at the tail end of the coplanar waveguide feeder (4) crosses the high-resistance slot (9) and is connected with the metal ground (2) at an edge (11). The tri-polarized slot antenna realizes multiband operation, can reduce the antenna dimension, cross polarization and shielding and improves isolation.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna with coplanar waveguide fed by grid slots and low-resistance side wall step impedance. Background technique [0002] The slot antenna is the dual antenna of the dipole antenna and has a wide range of applications. However, the ordinary slot antenna not only needs half the wavelength of the radiation slot itself, but also needs a large metal ground area around the radiation slot, usually the length of the metal ground is 1 / 2 larger than the length of the slot One wavelength, the width of the metal ground is one-half wavelength larger than the width of the slot. Multi-polarization MIMO can effectively improve spectrum efficiency and channel capacity. In order to apply MIMO technology to small terminals, antennas with different polarizations need to be co-located. A large metal ground will have a shielding effect on the radiation of the antenna, making the slot a...

AI Technical Summary

Problems solved by technology

A large metal ground will have a shielding effect on the radiation of the antenna, making the slot antenna unsuitable for co-located multiple-input multiple-output (MIMO) applications, especially when used as a multi-polarized antenna, a large metal ground will cause the antenna to Poor cross-polarization, poor isolation between antenna ports, which will lead to a decrease in spectral efficiency and channel capacity

At the same time, the impedance of the slot is very large, which also makes the impedance matching of the slot antenna feeding transmission line more difficult.

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