| Broadband wireless communication systems play an important rolein high-speed wireless communications,radar tracking and ranging areas,and has the advantages of high rate and low bit error rate.The antenna directly affects the quality of the communication as a radio front.With the development of wireless communication systems,but also with the emergence of many problems,For example,the system needs to have the characteristics of miniaturization and anti-interference.Therefore,in the broadband communication system,the research on the miniaturization and anti-interference technology of broadband antenna has become a hot research topic.This dissertation focuses on the study of wideband notch antenna.The broadband antenna is designed and analyzed by means of theoretical analysis,numerical simulation and experimental verification.At the same time,the filter antenna is also studied,and designed a good dual-polarized filter antenna.Finally,the miniaturized low profile anti-interference array antenna is analyzed.The main work of this dissertation is as follows:1.In this dissertation,the background and significance of broadband antenna and notch antenna are introduced in detail,and the method of realizing broadband antenna is given.The difficulties and existing problems of design of notch antenna are also given.The research status of miniaturized anti-interference array antenna is introduced,and the significance of miniaturized anti-interference array antenna is put forward.2.This dissertation designs three the broadband antenna according to the parameters of the antenna in the broadband wireless communication system.Respectively,for the broadband Vivaldi antenna,broadband circular polarization antenna and broadband dual polarized omnidirectional antenna.Firstly,the working principle of Vivaldi antenna is analyzed.On this basis,two Vivaldi antennas are designed and have good working characteristics.Secondly,the broadband circular polarized antenna is deeply researched,and a circularly polarized aperture antenna with graded L-type microstrip is designed and has good working characteristics.Finally,a mobile indoor communication system was studied,and a broadband double polarized omnidirectional antenna was designed.Through the study of three kinds of antennas,the structure and working mechanism of the three kinds of antennas are analyzed systematically.At the same time,the design advantages of the threekinds of broadband antennas are verified,and the antenna has wide relative bandwidth,stable gain and better radiation characteristic.3.In this dissertation,the broadband multi-signal interference problem in broadband systems is studied.Designed for use in RL(Radio location,5.15-5.825 GHz and 2.24-2.49 GHz wireless local area network(WLAN)a nd HIPERLAN / 2 wide-band notch antenna.Through the analysis of the microstrip network,slotting on the antenna,loading the step impedance resonant cell structure(SIR)and embedding technology to achieve the notch technology.The influence of different sizes of resonant elements on the notch frequency band is discussed,and the structure and operating characteristic curve of the antenna are given.In addition,this dissertation has carried on the related research to the filter antenna through a large amount of research,and has analyzed the merits and demerics.we designed a double polarized low profile filter antenna.4.In this dissertation,a 1 × 4 array antenna is designed,and the new material is integrated with the antenna to realize the design of low profile circular polarization anti-interference array antenna... |
PDF Full Text Request