Capacitance-loaded step impedance slot antenna

Abstract

The invention provides a capacitance-loaded step impedance slot antenna, and relates to a slot antenna. The antenna comprises a dielectric substrate (1), a metal ground plane (2), a radiation slot (3) and a microstrip feeder line (4), wherein the metal ground plane (2) and the radiation slot (3) are arranged on the dielectric substrate (1); the radiation slot (3) is formed in the metal ground plane (2); two ends of the radiation slot (3) are short-circuited; a plurality of parallel capacitors (7) are arranged at the middle part of the radiation slot (3) and are bridged to the edge of the radiation slot (3) to form a low-resistance slot (8); a high-resistance slot (9) is formed in the other part of the radiation slot (3); an antenna port (10) is arranged at one end of the microstrip feeder line (4); and the other end of the microstrip feeder line (4) is open, strides across the high-resistance slot (9) and extends a period of length. The antenna works on a multiband and the antenna dimension and cross polarization can be reduced.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a slot antenna with capacitive loading 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 ant...

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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