Research On Microstrip Antenna Based On Optical Transparent Film

With the coming of the internet of things and 5G era,mobile terminals are developing towards ultra-thin and multi-function.Therefore,the antenna performance is required to be higher and higher,but the design space left for the antenna is extremely limited.Traditional antennas not only take up a lot of space,but also affect people's visual experience and are not easy to integrate with equipment.The optically transparent antenna can overcome these effects due to their flexibility,transparency,good concealment and conformal characteristics.It is suitable for devices of various shapes or sizes and has attracted widespread attention.This thesis focuses on optically transparent antennas.The main work can be summarized as follows:1.A miniaturized broadband optically transparent microstrip antenna is designed.A monopole antenna fed by a coplanar waveguide is employed to achieve the broadband performance.An inverted T-shaped open slot and two scoop-shaped open slots are etched on the radiation patch to reduce the size of the antenna.The measurement results show that the center frequency of the antenna is 1.68 GHz,the-10 d B impedance bandwidth is 23%(1.45-1.97 GHz).The light transmittance is 80.6% and the antenna has a stable radiation pattern in the entire operating frequency band.2.A multi-band optically transparent microstrip antenna is designed.The loop monopole antenna is chosen to achieve the mid-frequency band,and a negative dielectric constant transmission line unit and a rectangular ring loaded on the antenna are used to achieve the low-frequency and high-frequency bands respectively.In order to increase the gain at low band,a reflector is placed under the antenna.The measurement results show that the center frequency of the antenna is 2.76 GHz,3.88 GHz,4.95 GHz.In the three frequency bands,the-10 d B impedance bandwidth are 18.77%(2.51GHz-3.03 GHz),17.52%(3.54 GHz-4.22 GHz),4.33%(4.74 GHz-4.95 GHz)and peak gain are 4.57,4.84,2.3 d Bi,respectively.The transmittance is80.7% and it has a stable radiation pattern in the three working frequency bands.