Research And Design Of Ultra-Wideband Band-Notch Antenna

Ultra-wideband antenna with notch design is one of the hot topics in recent research,it has the characteristics of ultra-wide operating frequency band and extremely small time domain pulse,which can make the antenna have a higher signal transmission rate and lower equipment power consumption.At the same time,notch technology can isolate the interference caused by the authorized narrowband band in 3.1-10.6GHz,so that the antenna has higher stability.On the other hand,due to the different propagation paths of the signal transmission process,there is a problem of multipath fading,and the multipleinoput multiple-output system(MIMO)technology can effectively improve this problem,so the combination of ultra-wideband notch antenna and MIMO technology is also a hot research direction in the field of antenna.In view of the above research directions,this paper systematically explains and verifies,and designs three notch ultra-wideband antennas with good performance.First,realizing the notch of an ultra-wideband antenna by adding a metal parasitic unit has been studied.Passive parasitic units of different lengths are added next to the antenna radiation unit,thus achieving dual-band notching.The operating frequency band of the antenna is 2.65-11.15 GHz,and the frequency band of the notch is 3.15-3.65 GHz and 5.05-5.85 GHz,which can cover the WiMAX(3.3-3.6GHz)band and WLAN(5.15-5.85GHz)two notch bands.The results of simulation and testing show that the antenna has relatively good working performance and can meet the design requirements.Then,realizing ultra-wideband MIMO antenna notch by slot technology has been studied.Circular arc-shaped grooves and inverted U-shaped grooves are provided on the antenna radiation unit and rectangular microstrip feeder to realize dual-band notch.The dual antenna unit is designed,and the T-shaped branch and Defected Ground Structures(DGS)are used for joint decoupling,so that the antenna has good isolation.The antenna operates in the frequency band of 2.3-12.5GHz,and the notch frequency band is 3.15-4.15 GHz and 5.05-5.87 GHz,which can cover the WiMAX(3.3-3.6GHz)band and WLAN(5.15-5.85GHz)two notch bands.Both simulation and test results show that the antenna has good operating performance and can meet the design requirements.Finally,realizing ultra-wideband MIMO antenna notches through floor branches has been studied.Add parasitic branches of different lengths to the floor to achieve dual-band notches.And the angle cutting technology and floor slotting technology are used to improve the impedance matching of the antenna and realize the ultra-wideband working frequency band of the antenna.Complementary Split Ring Resonator(CSRR)and Tshaped floor branches are used to decouple the antenna.The antenna operates in the frequency band of 2.92-11.00 GHz,and the notch band is 3.16-4.02 GHz and 4.32-4.74 GHz,respectively,which can meet the notch target in the WiMAX(3.3-3.6GHz)and INSAT(4.45-4.62GHz)bands.Both simulation and test results show that the antenna has good operating performance and can meet the design requirements.