Three-polarization slot antenna with coplanar waveguide feed metal via hole step impedance

Abstract

The invention discloses a three-polarization slot antenna with coplanar waveguide feed metal via hole step impedance, which relates to a slot antenna. The antenna is composed of three single-polarization antennas (13) placed vertically mutually. Each antenna (13) comprises a dielectric substrate (1), a metal ground (2) and a radiation slot (3) on the dielectric substrate (1) and a coplanar waveguide feed line (4), wherein the metal ground (2) is provided with the radiation slot (3); two ends (6) of the radiation slot (3) are short-circuited; the middle of the radiation slot (3) is provided with an array of two rows of metal via holes (7) to form a low-impedance slot (8); the rest part of the radiation slot (3) is a high-impedance slot (9); an outer conductor (5) of the coplanar waveguide feed line (4) is connected with the metal ground (2), and the tail inner conductor (12) passes across the high-impedance slot (9) to be connected with the metal ground (2) at the edge (11). The antenna works under multiple frequency bands, the antenna size, cross polarization, and shielding are reduced, and isolation is improved.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna with step impedance fed by a coplanar waveguide feeding a metal via hole. 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 antenna unsuit...

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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