Design And Research Of Millimeter-Wave Antenna-in-Package Based On LTCC Technology

The information society has higher and higher requirements for communication systems.Due to the scarcity of low-band spectrum resources,research on high-frequency millimeter-waveband is extremely urgent.Integrated antennas with low profile,high gain,wide impedance bandwidth,and high front-to-back ratio have become the current research trend,and wireless base stations have put forward higher requirements for miniaturization and integration of antennas.Low temperature co-fired ceramic(LTCC)technology has shown great advantages in the production of next-generation mobile communication devices because of its unique advantages.The chip antenna prepared by the LTCC technology has the advantages of small size,high temperature resistance,high reliability,and convenient surface packaging.This thesis mainly discusses the design and research of millimeter wave antenna-in-package based on LTCC technology.The main work includes: Firstly,a encapsulated stacked patch antenna suitable for millimeter wave communication is proposed.Based on the coupled resonator theory,the stacked patch element is designed and optimized.Then the feeding network of the antenna array is designed,and the antenna arrays of 1×2 and 2×8 are realized.The simulated and measured results of LTCC samples are in good agreement.Compared with single-layer patch,the impedance bandwidth of the stacked patch antenna unit is widened nearly 1 GHz,which verifies the validity of the design method.Secondly,a multi-port antenna which can be integrated with multi-channel front-end chip is designed based on the stacked patch structure.The pin of the chipmatches the feed port of the antenna.The comparison between the sample test and the simulation results is given and analyzed.Finally,to further expand the working bandwidth of encapsulated antenna,a broadband magnetoelectric dipole complementary antenna is proposed.The working mechanism of the antenna and the important parameters affecting the performance of the antenna are analyzed,and a broadband magnetoelectric dipole operating at 28 GHz is optimized.Compared with the laminated patch structure,the impedance bandwidth of the magnetoelectric dipole antenna expands by 0.8 GHz,providing stable gain and higher radiation efficiency in the working frequency band.