Grating slit ground metal via hole stepped impedance tri-polarization slot antenna

Abstract

A grating slit ground metal via hole stepped impedance tri-polarization slot antenna is disclosed and relates to a slot antenna. The antenna consists of three single-polarized antennas (13) that are perpendicular to one another; each antenna (13) comprises a dielectric substrate (1), a metal ground (2), a radiation slot (3) and a micro-strip feed line (4), wherein the metal ground (2) and the radiation slot (3) are arranged on the dielectric substrate (1), the radiation slot (3) and a plurality of parallel grating slits (6) are arranged on the metal ground (2), two ends of the radiation slot (3) are short circuits, the middle part of the radiation slot (3) is provided with two rows of metalized via holes (7), and therefore a low impedance slot (8) is formed; the rest part of the radiation slot (3) is a high impedance slot (9), one end of the micro-strip feed line (4) is an antenna port (10), and the other end of the coaxial feed line (4) is an open circuit which crosses the high impedance radiation slot (9) and extends beyond the same for a length. The antenna allows multi-frequency-band work; reduction of an antenna size, cross polarization and blocking is enabled; isolation improvement can be realized.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna with stepped impedance of a metal via hole of a grid slot. 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 unsuitable for co-loc...

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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