Tri-polarization slot antenna with coaxial feed capacitance loading stepped impedance

Abstract

The three-polarized slot antenna with step impedance loaded by coaxial feeding capacitance relates to a slot antenna, which is composed of three mutually vertically placed single-polarized antennas (13); each antenna (13) includes a dielectric substrate ( 1), metal ground (2) and radiation slots (3), coaxial feeder (4) on the dielectric substrate (1); radiation slots (3) on the metal ground (2); radiation slots (3) The two ends (6) are short-circuited; in the middle of the radiation slot (3), several capacitors (7) are connected in parallel across the edge to form a low-resistance slot (8); the rest of the radiation slot (3) is a high-resistance slot slit (9), the outer conductor (5) of the coaxial feeder (4) is connected to the metal ground (2), and the inner conductor (12) at the end of the coaxial feeder (4) crosses the high-resistance slot (9) at its edge ( 11), connected to the metal ground (2). The antenna is multi-band operation which reduces antenna size, cross-polarization, shadowing and improves isolation.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna with step impedance loaded by a coaxial feeding capacitance. 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-l...

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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