A compact, ultra-wideband omnidirectional antenna

Abstract

A compact, ultra-wideband omnidirectional antenna, comprising a first metal layer, a second metal layer, and a dielectric substrate; the first metal layer and the second metal layer are respectively printed on the upper and lower layers of the dielectric substrate, and the two layers of metal are divided by double Branch-flag radiator, double parasitic strips, curved grooves, short open-circuit branches and central metal disc; a short branch is loaded on the conical feed structure, which effectively suppresses the reactance characteristics of the antenna at high frequencies and introduces a high Frequency resonance point, when adding a double parasitic band, a new resonance point will be added between the two existing resonance points, the bandwidth will be increased, and a passband characteristic of 1.8 ~ 3.85GHz will be formed, and a short open circuit will be added at the end of the first branch. Branches and etched a curved slot increase capacitive coupling and current path, lowering the low frequency cut-off frequency. Finally, the impedance bandwidth of the antenna can reach 78% (1.69-3.85GHz). Within the impedance bandwidth, the cross-polarization level on the horizontal plane is less than -20dB, and the efficiency in the working frequency band is 80%-91%.

Description

technical field

[0001] The invention relates to the field of antenna engineering, in particular to a compact, ultra-wideband omnidirectional antenna. Background technique

[0002] With the increase of mobile data services, enhanced functions, and rapid growth of the number of users, indoor services have higher requirements on data transmission rate, system capacity, and performance. As an indispensable technology in 4G and 5G communication systems, multiple-input multiple-output (MIMO) technology has attracted widespread attention. This technology can improve the data transmission rate, reliability, channel capacity and communication quality of wireless communication in complex scattering environment, and realize the effective utilization of space resources. Meanwhile, omnidirectional antennas have received extensive attention due to their ability to provide 360° full coverage and reduce communication dead zones. In addition, the space in wireless communication systems suc...

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