Research And Design Of Wideband Multi-notched UWB Antenna

With the development of communication technology,ultra-wideband(UWB)wireless communication technology has a popularity application prospects in the business and the military field with the advantages of strongly anti-interference,fast transmission rate,ultra wide band width,higher multipath resolution,low power consumption compared with other wireless communication technology.As the core of the UWB communication system device,the UWB antenna plays a very important role in the applications of UWB technology,its quality directly affects the performance of UWB system.However,there are severe mutual interference between the UWB(3.1?10.6GHz)communication system and the narrowband systems,such as Worldwide Interoperability for Microwave Access(WiMAX),Wireless Local Area Network(WLAN),5G,X-band satellite communication,International telecommunication union band(ITU)etc.Therefore,multi wideband-notched characteristic is needed to the UWB antenna for reducing the interference with the narrowband systems.At first,the paper presents related definitions of the UWB antenna and UWB communication system and makes preliminary analysis about the development of UWB antenna,the research of scholars at home and abroad.Then the definition of some important performance parameters of the antenna,including:circuit parameters(input impedance,bandwidth and return loss and voltage standing wave ratio,etc),radiation parameters(the far field pattern,directivity and gain,radiation efficiency,antenna polarization and group delay,etc)are introducted in brief,and the research methods of the antenna are also further analyzed.After that,the current research direction and design difficulties of UWB antenna are summarized.Finally,the following research work of the three parts is done in this paper:(1)The UWB antenna is designed with the compact slot structure after fully studying the compact planar structure in this paper.And then,designs slot multi-notched UWB antenna prototype which is based on the structure of coplanar waveguide(CPW),since then,verifies that the antenna can achieve more compact with the CPW feed.(2)This section makes a deep research to the present the notched characteristic.In order to avoid the interference between UWB communication system and narrowband communication systems such as WLAN,WiMAX,5G,satellite x-band and ITU,the three single-broadband-notched UWB antenna are designed respectively based on the UWB antenna prototype.(3)Considering the suppression of the narrowband communication systems such as WLAN/WiMAX/5G/X-band satellite communication/ITU in the UWB communication band.The paper designs the double broadband-notched UWB antenna and triple broadband-notched antenna respectively under the premise of the single broadband-notch UWB antenna.