Coaxial feed capacitance-loaded triple-polarized slot antenna

Abstract

The invention provides a coaxial feed capacitance-loaded triple-polarized slot antenna, and relates to a slot antenna. The antenna comprises three single-polarized antennas (11), which are perpendicular to each other, wherein each antenna (11) comprises a dielectric substrate (1), a metal ground plane (2), a radiation slot (3) and a coaxial feeder line (4); each metal ground plane (2) and each radiation slot (3) are arranged on the corresponding dielectric substrate (1); each radiation slot (3) is formed in the corresponding metal ground plane (2); two ends of each radiation slot (3) are short-circuited; a plurality of capacitors (7) are arranged in each radiation slot (3) and are bridged to the edge of the radiation slot (3) in parallel; an antenna port (8) is arranged at one end of each coaxial feeder line (4); and an inner conductor (9) at the other end of each coaxial feeder line (4) strides across the corresponding radiation slot (3), is located at the edge (10) of the corresponding radiation slot (3) an d is connected with the corresponding metal ground plane (2). According to the antenna, the antenna dimension, cross polarization and shielding can be reduced, and isolation can be improved.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna loaded with a coaxial feeding capacitor. 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-located multiple-inpu...

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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