Design And Research Of Microstrip Patch ESPAR Antenna

Through the control of the phase shifter,the traditional array antenna completes the function of changing the radiation direction.However,with the extensive use of phase shifters,it not only increases the energy consumption of the entire system,but also makes the electrical structure more complex.It will have a lot of loss in the high frequency band.Hence,the electronically controlled passive array antenna(ESPAR)technology that uses adjustable inductance and variable capacitance to replace phase shifters can effectively reduce system power consumption and simplify antenna design.It has broad applications in the field of smart base stations or new generation mobile communications.Application space.The work of this article is summarized from the following three parts.Firstly,a new microstrip patch ESPAR antenna structure is obtained by combining microstrip patch antenna structure with ESPAR antenna structure.The type of antenna has low cost,conformal to the carrier,and ease of production are its outstanding advantages.However,the microstrip antenna has some shortcomings to be improved.The radiation gain of this type of antenna is not high and the radiation direction is single.Since the microstrip antenna has these needs to be improved.The microstrip patch ESPAR antenna was designed.There are three parts that make up the structure,namely the microstrip patch,the dielectric plate and grounding board.The main frequency is 3GHz for this microstrip antenna.The average gain is 8.5d Bi.By loading a variable capacitor and inductor,its continuous sweep frequency range is from-30 ° to 30 °.Secondly,the slot antenna is integrated into the ESPAR antenna structure.In other words,the new antenna structure is obtained by introducing the ESPAR antenna structure into the bow-tie slot antenna.And the effects of in-line microstrip and reactance on the radiation efficiency and direction of the three elements patch ESPAR antenna are discussed in detail.In order to study the parameters that affect the antenna performance,the gap structure,feeder length and microstrip patch shape are analyzed.Thirdly,taking the bow tie slot coupled microstrip ESPAR array antenna as the platform,comparative experiments are added to analyze the relationship between the shape of different microstrip patches and the antenna function.The E-shaped slot structure is introduced to further improve the gain and sweep range of ESPAR antenna.The main frequency is 3.67 GHz for this microstrip antenna.Under the condition of normal antenna performance,the e-slot microstrip patch ESPAR antenna achieves a continuous frequency sweep of-46 ° to 46 ° and a maximum radiation gain of 10.23 d Bi.