Gate slot ground coaxial feed capacitor loaded phase step impedance tri-polarization half-groove antenna

Abstract

A three-polarized half-slot antenna with coaxial feeding capacitance loaded with step impedance by a grid slot relates to a slot antenna, which is composed of three 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) and multiple parallel grid slots (6) on the metal ground (2) One end of the radiation slot (3) is short-circuited, and the other end is open; the radiation slot (3) has several capacitors (7) connected in parallel across its edge to form a low-resistance slot (8) near the open-circuit end; the radiation slot ( 3) The remaining part is a high-resistance slot (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), it is connected to the 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 three-polarized half-slot antenna with a coaxial feed capacitor loaded with a grating slot and a step impedance. Background technique [0002] The slot antenna is the dual antenna of the dipole antenna and has a wide range of applications. However, a common slot antenna not only has a half-wavelength of the radiation slot itself, but also requires a large metal ground area around the radiation slot. Usually, the length of the metal ground is half 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. Larger metal ground will block the radiation of the antenna, making the slot antenna unsuitable for co-located multiple input...

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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