Design And Research Of Multi-structure Antenna

Antennas are an important part of today's communications design.In 2020,as the first year of the development of 5G communication,the era of interconnection of all things will also start,and the demand for multi-functional and diversified antennas is also increasingly strong.In the context of the ever-changing communication technology,this paper proposes a multi-structure of "one line and multiple uses" Antenna design scheme,that is,one antenna realizes the functional design of multiple antennas.In today's increasingly diversified antenna design,the development of antennas faces more and more challenges.Taking the current directional exploration of antennas as an example,not only an omnidirectional multi-directional receiving antenna,but also a directional super-gain antenna design.According to the basic electromagnetic theory,the bandwidth,gain,and omnidirectionality of the antenna are design parameters that are not tunable most of the time.Optimizing one often requires sacrificing other performance.This thesis aims to find a method that can simultaneously improve the antenna The parameter method is dedicated to improving the performance of the antenna in all directions,which means that not only mature antenna optimization technology but also innovative structural design is needed to meet this requirement in antenna design.This thesis is based on this A multistructure folding antenna design method is proposed.Based on the basic theories of monopole antenna design,Bowtie antenna design,electromagnetic boundary conditions,and electromagnetic coupling,two new antenna structures with different characteristics based on folding design are designed.The main problems involved in this thesis are to improve the shortcomings of the traditional monopole antenna,which has a relatively narrow bandwidth and relatively low gain,to improve the traditional Bowtie antenna to increase the directional coefficient and gain of its radiation,and to find in the design of two types of antenna A structure that can combine the excellent characteristics of these two days.Finally,a multi-structured antenna combining a fan-shaped monopole and a Bowtie antenna was designed.The electromagnetic reflection theory,multi-structure loading design and capacitive coupling were used to improve its bandwidth.The slotted design adjusted the antenna frequency and gain parameter.Combined with the known folding structure,another folding antenna structure working in the 5G frequency band is designed.This design makes the antenna work in different frequency bands before and after folding,and the antenna exhibits different operating characteristics under high and low frequency working conditions.The main work of this thesis is as follows:1.Based on the design theory of monopole antenna,comprehensively analyze various ultra-wideband design technologies,and design a sector monopole antenna.Through loading and other structural design,the impedance matching design in each frequency band is improved,and based on the electromagnetic boundary theory,a structure that significantly improves the antenna characteristics is designed.The structure has little effect on the antenna characteristics before folding and before the antenna is expanded,and It has a great influence on the characteristics of the expanded antenna,and at the same time analyzes the impact of different angles and reflective structures on its performance.2.Based on the Bowtie antenna and electromagnetic reflection theory,a multi-band directional high-gain antenna is designed.The structure is designed by deforming on the original antenna structure,and the related theoretical design scheme using electromagnetic boundary conditions makes the new Based on the smallest possible influence on the original structure,the augmented structure improves the antenna frequency,return loss and other parameters,and combines the parabolic antenna theory to improve its performance.3.Combining the characteristics of the two antennas,a foldable antenna structure is designed,which is repeatedly adjusted between the two structures to achieve a delicate balance,and the possible design is simple and practical folded structure,thereby designing a set of ultra-wideband,Super gain,omnidirectionality and miniaturization and integrated antenna design.4.A brand-new antenna for antenna folding and frequency division is designed,that is,the difference in radiation characteristics before and after folding makes the antenna work at low frequency and high frequency before and after folding.Mainly use near-field coupling reradiation to improve the antenna's radiation efficiency design ideas,and at the same time combined with the design method of broadband antennas,improve the antenna's working bandwidth.