Research On The UWB Antenna With Band-Notched Characteristic

Since the FCC(Federal Communications Commission)officially allowed the introduction of Ultra-wideband(UWB)communication technology into the civilian sector,the development of ultra-wideband technology has been rapid,as its operating frequency is 3.1-10.6GHz,which fully covers UWB in this frequency range.Antennas have gradually become a research hotspot.However,there are other narrowband communication systems in the UWB band,such as narrowband interoperable microwave access bands(WiMAX,3.3-3.7GHz)and wireless local area networks(WLAN,5.15-5.35GHz,5.725-5.825GHz),which will interfere with UWB systems In order to solve these problems,the main work of this article is as follows:First of all,the research background,development status and characteristics of UWB technology are introduced,and the realistic requirements of notched UWB antennas are put forward.The theoretical research of UWB notched antennas is emphasized,and the methods of widening the bandwidth of antennas are introduced.Several common principles and methods to achieve notches.Then,an ultra-wideband antenna with ideal performance and simple structure is proposed.The antenna is based on the premise of a circular radiating patch antenna,and a tapered trapezoidal structure is introduced between the patch and the ground plate to widen the bandwidth of the antenna.And through multiple simulations to optimize the parameters that affect the antenna bandwidth,an ultra-wideband antenna with ideal omnidirectional radiation characteristics in the impedance bandwidth of 2.7-11GHz is finally obtained.Then,based on the previously designed UWB antenna,two kinds of single notch antenna design and one kind of dual notch antenna design are proposed.By opening an arc-shaped H-shaped groove on the circular radiation patch and continuously adjusting various parameters of the H-shaped groove,a notch band of 3.2-3.8GHz is obtained,and interference of the WiMAX signal is avoided.A method of combining the two technologies by opening a rectangular groove on the circular radiation patch and adding an L-shaped branch on the ground,that is,adding a half-wave resonator to the antenna equivalent circuit,and adjusting the length of the rectangular groove and the branch to make it A notch band is generated at the required notch center frequency,so that the antenna fonns a 5.0-5.8GHz notch band in the 2.7-11GHz ultra-wideband range,effectively preventing the WLAN signal from interfering with the system.The design of the dual notch antenna is optimized by combining the above two single notch structures,and the optimization of the radius RH of the circular H-shaped groove and the length W3 of the L-shaped branch is optimized.Broadband antennas have stopbands of 3.2-3.8GHz and 5.0-5.8GHz,The notch effect reaches 6dB and 8dB respectively.And in the passband,they can achieve good omnidirectional radiation characteristics while maintaining stable and high gain.Finally,the work of this paper is summarized,and expectations for future work are given.