| In order to maximize the potential of 5G communications,5G networks in the future will likely be deployed with a combination of millimeter wave and Sub-6 GHz,and use broadband technology as much as possible to achieve performance optimization.As an electromagnetic wave transmitting and receiving device,the antenna profoundly affects the performance of the communication system.The development of wireless communication technology urgently requires the new generation of broadband antennas to have the excellent characteristics of wide impedance bandwidth,high gain,and stable pattern.This thesis mainly discusses the design and research of millimeter wave and Sub-6 GHz wideband antennas for 5G and future communications.First,based on the Low Temperature Co-fired Ceramic(LTCC)process,a folded magneto-electric dipole antenna is implemented.The working mechanism of the magnetic dipole and electric dipole alternately excited to form a complementary antenna is analyzed.Based on this,a magneto-electric dipole antenna with two parasitic patches is proposed,with a center frequency of 28 GHz and optimized using a bat algorithm.Compared with the traditional magneto-electric dipole antenna,the-10 d B impedance bandwidth of the antenna loaded with the parasitic patch is increased from26% to 34%,the gain in the band is more stable,and the overall size is reduced by about 25%.After that,the design of the feeder network was completed,and 1 × 2,2 × 2 antenna array were realized.Then,the antenna unit and array are processed and tested,and the test results are in good agreement with the simulation results.Secondly,different from the traditional design method,this thesis optimizes the U-slot patch antenna that operates at 5 GHz based on the coupled resonance theory.The results show that the established design goal can be achieved after a few iterations.The-10 d B impedance bandwidth is 23% and the realized gain in band is 6.6 ±0.8 d Bi.Furthermore,the design of the 1 × 4 antenna array was completed,with the maximum realized gain of 12.44 dBi. |
