Metal through hole stepped-impedance half-slot antenna

Abstract

The invention discloses a metal through hole stepped-impedance half-slot antenna which comprises a medium substrate (1), a metal ground (2) and a radiation slot seam (3) on the medium substrate (1), and a microstrip feed line (4). The radiation slot seam (3) is arranged on the metal ground (2). One end of the radiation slot seam (3) is designed as a short circuit while the other end (6) an open circuit. A low impedance slot seam (8) is formed by two rows of metal through hole (7) arrays near the end of the radiation slot seam with the open circuit. The rest part of the radiation slot seam (3) is a high impedance slot seam (9). One end of the microstrip feed line (4) is an antenna port (10) and the open circuit at the other end of the microstrip feed line (4) crosses the high impedance slot seam (9) and extends a certain amount of lengths. The antenna of the invention can work with multiple bands. With reduced size, the antenna achieves cross polarization. Well blocked, an improved isolation effect can be achieved as well.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a half-slot antenna with metal via hole 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 difficult to match the impedance of the slot an...

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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