Piezoelectric Structure Design And Performance Modulation For Mechanical Antenna

In the existing long-wave communication,mechanical antenna has attracted wide attention because of its outstanding characteristics of ultrasmall size and low power consumption.It relies on dipole moment oscillation or mechanical movement of electric charge to realize radiation.With a new radiation mechanism,it breaks through the limitation of radiation and antenna size in traditional antennas,which is several orders of magnitude smaller than that of traditional antennas,and effectively solves the need for portability.In this field,researchers mostly design the signal transmission scheme of the mechanical antenna,but lack of research on the structure design and performance modulation of the antenna.Based on the basic theory,this paper makes a further study on the piezoelectric antenna.Firstly,the research progress of mechanical antenna is summarized.Mechanical antenna is divided into permanent magnet antenna and piezoelectric antenna,and the two are divided in more detail.The performance of various mechanical antennas is analyzed,including radiation mechanism and signal modulation,compares the radiation performance of various schemes,and makes it clear that the research object is the piezoelectric antenna with great application potential.Secondly,the related theory of piezoelectric antenna is introduced,including piezoelectric effect,piezoelectric material and polarization.The polarization is analyzed by the antenna feed mode to determine the feasibility of designing the antenna system and the influence of polarization on the radiation performance of the antenna.The piezoelectric effect and radiation are explored through the simulation software to verify the theoretical feasibility.Establish the research goal,design and build the communication test platform based on the piezoelectric antenna,complete the actual effective radiation test of the antenna and explore the horizontal plane pattern.Thirdly,facing the antenna structure design and performance modulation,many factors affecting the antenna radiation performance are explored by using the test platform,including material,electrode area,structure thickness,structure diameter,temperature,polarization,input power,electrostriction coefficient.Based on the theory of piezoelectric and circuit,the received power of the receiver is observed,and the influencing factors are analyzed and summarized according to the measured impedance data and smith impedance chart.The antenna structure and system design with stronger radiation performance are determined.By using information coding,the long-distance communication based on piezoelectric antenna system is realized.The influence of two-channel signals on the antenna binary array is explored,and the impedance matching of the antenna system is carried out by adding lumped elements to show high radiation performance.It is expected that better antenna performance can be achieved by controlling the above factors and designing arrays and impedance matching systems.