Characteristics Analysis And Application Research Of Conformal Two-Dimensional Transmission Line

Two-Dimensional Transmission Line(2DTL)is composed of microwave periodic structure,which is a new two-dimensional electromagnetic wave propagation medium.Different from the traditional point-to-point transmission using wire and waveguide or space radiation transmission,the electromagnetic wave propagates in the form of slow waves in the transmission line,and the electromagnetic signal can be transmitted with other equipment by placing coupling devices on the surface of the transmission line.Two-dimensional transmission line has the advantages of flexible coupling position,and having wider transmission band and supporting multiple couples working at the same time.Therefore it has a far-reaching development space in recent years in the boom-growing Internet of Things,sensor network and wearable equipment and other technical fields.Based on the two-dimensional transmission line structure,this thesis studied the application of two-dimensional transmission line in the antenna and designed power divider structure based on 2DTL,and explored the conformal transmission characteristics of two-dimensional transmission line.The main work is in the following:Firstly,the thesis introduced the reason why 2DTL was proposed and the development processing of 2DTL.Some prominent advantages of 2DTL in related application were described in the thesis as well.The thesis summarized four main structure forms of the two-dimensional transmission line and introduced their merit and demerit,analyzed the characteristics of electromagnetic field in 2DTL and elaborated the energy coupling principle.Secondly,this thesis studied the dispersion characteristics of two kinds of periodic structural units,and analyzed the transmission characteristics of the two-dimensional transmission lines composed of them.And this thesis studied the leaky wave antenna based on the two-dimensional transmission line,the result was obtained by simulation that single patch element radiation efficiency can reach 40%.This thesis analyzed the reason why the double same patch units radiated unequal power.And by adjusting the patch size,double patches leaked equal power separately.Also,the array antenna based on two-dimensional transmission line was studied,when the port phase difference was 45°,the beam offset of rectangular array antenna array was about 30°,while that of parallelogram array antenna array was 24°.Then,this thesis studied the power divider structure based on the two-dimensional transmission line.By setting the phase of the excitation ports,the output of the transmission line with different power component ratio was realized.Finally,this thesis explored the conformal transmission characteristics of two-dimensional transmission line with different aperiodic surface and medium thickness.Also,this thesis studied the influences of the radius,direction and type of conformal carrier about transmission characteristics.The conformal transmission line of the final design was tested and compared with the simulation result.It was concluded that the two-dimensional transmission line has good conformal characteristics,and the transmission characteristics are good in a large range of curvature,with the aperture radius of the periodic surface becoming small,the polygon edge number decreasing and the thickness of the dielectric layer of the transmission line increasing,the passband frequency of the transmission line shifts up.