High-isolation MIMO double-frequency antenna

Abstract

The invention discloses a double-frequency MIMO antenna with very high isolation. The antenna is composed of a rectangular insulating dielectric substrate, a radiating surface, a phase modulation network, a decoupling network, a matching network and a lower-layer metal grounding plate of an etching ground sinking structure. The antenna is composed of two symmetrical radiation units, the size of the antenna is reduced by adopting a branch bending meandering technology, each radiation unit is composed of two inverted L-shaped branches, and low-frequency (2.45GHz) radiation and high-frequency (5.8GHz) radiation are generated respectively. In a low frequency band, the phase modulation network and the inverted T decoupling network are introduced to improve the isolation degree between double antennas; and in a high frequency band, the isolation degree of the high frequency band is improved through a structure shaped like a Chinese character 'shan'. The double-frequency impedance matching network is connected to adjust the reflection coefficient of the double frequency bands. The antenna can meet the requirement that the reflection coefficient (S11) is less than -15dB (S11<-15dB) withinthe frequency bands of 2.4-2.5GHZ and 5.75-5.86GHZ, the isolation degree (S12) is less than -20dB (S12<-20dB) within the frequency bands of 2.4-2.5GHZ and 5.75-5.86GHZ, and the omnidirectional radiation requirement is met. The antenna is low in cost, simple in structure, excellent in performance and capable of meeting the requirement of an existing dual-band mobile communication band at the same time.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to an antenna applied to a high-isolation MIMO dual-frequency antenna. Background technique [0002] With the explosive growth of the number of mobile users and the rapid development of technologies such as the Internet and multimedia, people's requirements for communication capacity and spectrum utilization are also increasing rapidly. In the traditional single-input single-output (SISO) communication system, because multipath propagation causes multipath signal effects with different delays to cause interference, the amplitude of the signal is either enhanced or reduced, making the communication unstable. And its point-to-point transmission channel capacity is restricted by Shannon's theorem. MIMO technology adopts multi-antenna technology and space-time diversity technology, uses multipath effect to improve the stability of communication link and break through the b...

AI Technical Summary

Problems solved by technology

However, for the multi-antennas arranged in a mobile terminal with a very limited volume, the distance between the antenna elements is often difficult to reach half a wavelength, which inevitably produces strong electromagnetic coupling. The energy fed from one port should have been It may radiate more into space, and now it becomes coupled to other units to form energy leakage, and the antenna efficiency is greatly reduced

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