Coaxial feed capacitor-loaded stepped impedance type tri-polarization half-slot antenna

Abstract

The invention discloses a coaxial feed capacitor-loaded stepped impedance type tri-polarization half-slot antenna, and relates to a slot antenna. The 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), as well as a coaxial feeder line (4); the radiation slot slit (3) is formed in the metal ground (2); one end of the radiation slot slit (3) is in short circuit while the other end (6) of the radiation slot slit is in open circuit; a low resistance slot slit (8), which is formed by multiple capacitors (7) that are bridged on the edge of the radiation slot slit (3) in parallel, is formed in the part, close to the open circuit end, 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 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-polarized half-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...

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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