Design Of Low Profile Circular Polarization RFID Antenna Based On Ceramic And PCB Material Combination

With the continuous expansion of the application scope of RFID technology in the field of intelligent storage,the RFID reader antenna suitable for intelligent storage cabinet has attracted more and more attention.Because the antenna is generally installed on the cabinet wall of storage cabinet,the profile of the antenna is very strict.Therefore,how to design an RFID antenna suitable for intelligent lockers considering other performances of the antenna under the condition of low profile is an engineering problem worthy of solution.In this thesis,based on the in-depth analysis of the characteristics of circular polarization antenna composed of ceramic materials and PCB materials,two technical schemes of dual material composite antenna and dual material ground radiation antenna are proposed by combining the two materials to achieve low profile circular polarization and high gain of RFID antenna.The main work is as follows:The first part of the work is the design and implementation of the ground radiation antenna and its circular polarization array antenna based on ceramic substrate and PCB materials.This thesis combines ceramic substrate and the PCB material,through introducing refers to the structure at the bottom of the ceramic substrate and optimizing the structure parameters of the PCB,designed a Linearly polarized dual material antenna element,on this basis,the circular polarization array is composed of four linearly polarized ground radiation antenna elements and a four-port power split phase shifting feed network.The second part of the work is the design and implementation of low profile RFID antenna based on ceramic materials and PCB materials.In this thesis,a new method of dualmaterial low-profile circularly polarized antenna is proposed,which is composed of a ceramic dielectric microstrip antenna and a four-element deformed f-inverted antenna composed of PCB material.Due to two kinds of structure in close proximity,the coupling between them phenomenon is relatively serious,therefore,a six-port power split-phase shifting feed network is designed,then optimizing the antenna with the feed network together.A low profile combined antenna that meets the bandwidth requirements is obtained,and use it as an antenna element to design diagonal array binary RFID antenna.All in all,this thesis is in accordance with the need of RFID antenna under the condition of low profile both circular polarization,bandwidth,gain the performance of the actual demand,put forward the ceramic material and PCB material combination build double material combination antenna array antenna and ground radiation two solutions,for tighter RFID antenna height limit usage scenarios provides reference solution.