Research And Design Of Miniaturized Ultra-wideband MIMO Antenna

With the rapid development of contemporary mobile communication technologies,there is an increasing demand for wireless portable mobile devices.Terminal antennas are the key components of the wireless terminal,and its miniaturization,wideband and multi-antennaization have become the hotspots of current research.UWB(Ultra Wideband)UWB(Ultra Wideband)can be effectively applied to short distances due to its low power consumption,high bandwidth,high transmission rate,low complexity,strong multipath resistance,low power spectral density of transmitted signals,and high security.End-to-end wireless communication.In addition,Multiple Input Multiple Output(MIMO)technology places multiple antennas in the terminal antenna to achieve higher transmission rates and longer transmission distances.However,how to reduce the coupling degree between antenna elements while achieving miniaturization is the most important problem faced by current MIMO antennas.The article conducts theoretical research on the miniaturization design,decoupling design and notch design of the antenna.The main work of the article is carried out around these three aspects.First,the article designs a two-port ultra-wideband MIMO antenna with dual notches.By adding U-shaped resonant rings to the antenna radiating unit and feeder,the WLAN band notch and satellite communication downlink X-band are generated.Only20 mm × 30 mm.Analysis of simulation and test results shows that the operating bandwidth of the antenna is 2.9-12.2 GHz,the WLAN notch band is 5.1-5.9 GHz,and the satellite communication X-band notch band is 7.1-8 GHz.In the working frequency band except the notch band,the isolation between the antenna elements is greater than15 dB.The notch design of this antenna adopts a slotted structure,and the isolation design adopts a unified structure of branching and slotting to achieve the design goal of double notch high isolation.Then,the article designs a four-port miniaturized ultra-wideband MIMO antenna with integrated chip waveguide technology.The four element feeders of the antenna are located at four diagonal corners of the substrate.Through-hole connection increases the current path on the radiating element in a small space.Analysis of simulation and test results show that the size of the antenna is only 34mm×34mm,the working bandwidth of the antenna is 2.5-11.6GHz,and the isolation between the two units in the workingband is greater than 18 dB.The miniaturized design of this antenna adopts SIW structure,and the isolation design adopts slotted structure,which achieves the design goal of miniaturization and high isolation of the antenna.