Grating slit ground coplanar waveguide-fed low impedance side wall stepped impedance slot antenna

Abstract

A grating slit ground coplanar waveguide-fed low impedance side wall stepped impedance slot antenna is disclosed and relates to a slot antenna. The antenna comprises a dielectric substrate (1), a metal ground (2), a radiation slot (3) and a coplanar waveguide 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 metalized side walls (7) which form a low impedance slot (8), the rest part of the radiation slot (3) is a high impedance slot (9), an external conductor (5) of the coplanar waveguide feed line (4) is connected with the metal ground (2), an internal conductor (12) arranged at the tail end of the coplanar waveguide feed line (4) is connected with the metal ground (2) at edges (11) of the high impedance slot (9) after crossing the high impedance slot (9). 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 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. A larger metal ground will make the slot antenna unsuitable for multiple-input multiple-output (MIMO) applications, resulting in poor cross-polarization of the antenna, 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 it d...

AI Technical Summary

Problems solved by technology

A larger metal ground will make the slot antenna unsuitable for multiple-input multiple-output (MIMO) applications, resulting in poor cross-polarization of the antenna, 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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