Coaxial feed low-resistance side wall stepped impedance type tri-polarization slot-slit antenna

Abstract

The invention discloses a coaxial feed low-resistance side wall stepped impedance type tri-polarization slot-slit antenna, and relates to a slot antenna. The antenna comprises three perpendicularly-placed single-polarized antennas (13), wherein each antenna (13) comprises a dielectric substrate (1), and a metal ground (2) and a radiation slot slit (3) on the dielectric substrate (1), and a coaxial feeder line (4); the radiation slot slit (3) is formed in the metal ground (2); the two ends (6) of the radiation slot slit (3) are in short circuit; a low resistance slot slit (8) formed by two metalized side walls (7) is formed in the middle of the radiation slot slit (3); a high resistance slot slit (9) is formed in the rest part of the radiation slot slit (3); the outer conductor (5) of the coaxial feeder line (4) is connected with the metal ground (2); and the inner conductor (12) at the tail end of the coaxial feeder line (4) crosses over the high resistance slot slit (9), and is connected with the metal ground (2) on the edge (11) of the high resistance slot slit (9). The antenna is in multi-band operation, so that the antenna dimensions, and the conditions of crossed polarization and shielding can be reduced, and isolation among ports can be improved.

Description

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

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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