| With the rapid development of modern communication systems,wireless devices require faster and faster transmission rates of data and information.The original low frequency band has gradually been unable to meet the demand,and the millimeter wave frequency band is increasingly caused by the characteristics of short wavelength and wide frequency band.With the attention of experts and scholars,millimeter wave antennas also have the advantages of miniaturization,high performance,and high integration.Then use the package antenna technology(Aip),and integrate one or more radio frequency chips in the package.The high integration design of the entire radio frequency system is realized through the interconnection structure between the three-dimensional stacks.In this paper,the millimeter-wave broadband,dual-polarization,high-gain,high isolation single-port and multi-port antennas based on e WLB technology are researched and designed.The main work is summarized as follows:(1)For the 5G millimeter wave four-port chip,a four-port dual-polarization high isolation package antenna is designed.The packaged antenna uses the basic structure of a square microstrip patch antenna and uses slotted meandering technology to etch a circular groove on the square patch to move the resonant frequency to low frequencies,which can achieve miniaturized performance.A pair of rectangular grooves are etched near the shaped groove,which extends the current path and enables the-10 d B bandwidth to cover the24.25-27.5GHz frequency band.Secondly,the feeder adopts the bending branch method,which further reduces the overall package size.By setting the radiation direction of port 1 and port 3 to the horizontal direction,and the radiation direction of port 2 and port 4 to the vertical direction,the dual polarization of the antenna is realized.Finally,a simple capacitive coupling decoupling structure is used to make the distance between the antenna and the antenna less than a quarter wavelength,the isolation is better than 20 d B,and the gain at the center frequency is about 7.9d Bi.(2)First,a broadband antenna unit for 77 GHz automotive radar is proposed.The feeder uses quarter-wavelength tapered transmission lines to match the port to the antenna,and uses plug-in feeding to make the return loss at the center frequency smaller.The basic structure of the antenna adopts a circular patch and adopts the grooved meandering technology.In the circular patch,a sector-shaped slot is carved by cutting,and the angle is ?.By reasonably controlling the radius of the circle and the angle of the sector,it can be better control the resonant frequency of the circular patch.Then through the theory of coupled resonators,a pair of concaved arms are coupled on both sides of the circular sector patch,and a resonance point is introduced at the high frequency to further broaden the impedance bandwidth of the antenna.The fractional bandwidth of the antenna is 23.2%,and the gain at the center frequency is about 5.6d Bi.Secondly,on the basis of the proposed antenna unit,three-port and four-port packaged antennas are designed,respectively,through a one-to-three broadband Wilkinson power divider and a one-to-four broadband Wilkinson power divider to achieve high gain.The fractional bandwidth of the three-port antenna is 37.5%,and the gain at the center frequency is about 7.5d Bi,and the fractional bandwidth of the four-port antenna is42.7%,and the gain at the center frequency is about 6.1dBi. |
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