Research On Flexible Monopole Antenna Based On Coplanar Waveguide

With the development of mobile communication technology and the emergence of all kinds of intelligent terminal equipment,people's demand for short-distance high-speed data transmission,portable and miniaturized electronic equipment is getting higher and higher;at the same time,the development of modern flexible electronic devices is in full force,in this new field,the demand for flexible,portable and reliable antennas is expected to grow exponentially,flexible antennas have been used in a wide range of applications,such as invehicle communications,navigation,and integration with satellite solar cells.Based on the development of modern mobile communication technology and the popularity of flexible electronic devices,this paper designs three types of coplanar waveguide fed flexible antennas for the application of three different scenarios,meanwhile,combined with micro-nano processing technology,two different processing processes are designed.In this paper,the research background and development trend at home and abroad of flexible antenna and UWB notch antenna are introduced firstly,and the radiation theory,basic electrical parameters,impedance matching theory and UWB notch technology of coplanar waveguide antenna are introduced.An inverted trapezoidal flexible antenna for 5G millimeterwave(MMW)communication and a double circular flexible antenna for UWB communication are designed in ANSYS HFSS,the two antennas are based on flexible polydimethylsiloxane(PDMS)as the dielectric substrate,and one side of the dielectric substrate is covered with copper.In this paper,the preparation process of flexible polydimethylsiloxane(PDMS)and the pretreatment of antenna dielectric substrate are studied.In addition,a high-precision separator is designed as a mask,and the antenna structure is directly spattered on the antenna medium substrate.After the fabrication,the performance of the two antennas is tested respectively.The test results show that the frequency point of 5G inverted trapezoidal flexible antenna is 25.7GHz,which meets the requirements of millimeter-wave communication.The bandwidth of the ultrawideband flexible antenna includes the ultra-wideband(UWB)band of(3.1?10.6GHz),which can meet the requirements of ultra-wideband communication under certain bending conditions.The test results of the two antennas are in good agreement with the simulation results,showing good impedance matching characteristics and stable far-field radiation mode.In this paper,on the basis of ultra-wideband antenna designed a double loop type ultra broadband notch flexible antenna,by adding resonance in the ring side to achieve the function of interference spectrum trap,innovative can be introduced in 2.60 to 5.70 GHz broadband segment tuned resonant troubles and notch frequency formula of gaussian avoids the unnecessary operation in full-wave simulation software and error.Reformed the traditional micro-nano lithography process,and antenna with flexible material(PDMS)as substrate was processed,built in Wi MAX band(3.3 ? 3.7 GHz)and c band satellite communication band(3.7? 4.2 GHz)with high inhibition effect of ultra-wideband antenna parameters model,the next making antenna was tested,the antenna shows good flexibility,high frequency band refused to ability,wide impedance bandwidth and good radiation performance,which is an ideal antenna UWB applications.The three antennas designed in this paper are all fed by coplanar waveguide structure,and they have good impedance matching characteristics and extremely low return loss mode,they also take into account miniaturization,which provide a wide range of application prospects for the development of mobile communication technology and flexible intelligent terminals.