Dual-band capacitor loading stepped-impedance tri-polarized half slot antenna

Abstract

The triple-polarized half-slot antenna with dual-frequency capacitor-loaded step impedance relates to a slot antenna, which is composed of three mutually perpendicularly placed single-polarized antennas (13); each antenna (13) includes a dielectric substrate (1) , the metal ground (2) and the radiation slot (3) on the dielectric substrate (1), and the microstrip feeder (4); the radiation slot (3) is on the metal ground (2); the radiation slot (3) is short-circuited at one end , the other end (6) is open; the radiation slot (3) near the open end has several capacitors (7) connected in parallel across the edge of the radiation slot (3) to form a low-resistance slot (8); the radiation slot (3) The rest is a high-resistance slot (9), one end of the microstrip feeder (4) is the antenna port (10), and the other end of the microstrip feeder (4) is open-circuited across the high-resistance slot (9) and short-circuited at the edge (11) Pin (12) is connected with metal ground (2). The antenna operates in multiple bands, allowing for reduced antenna size, cross-polarization, shadowing, and improved isolation.

Description

technical field [0001] The invention relates to a slot antenna, in particular to a triple-polarized half-slot antenna with dual-frequency 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. 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-loca...

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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