doi:10.16186/j.cnki.1673-9787.2020.5.15

Received:2019/12/11

Revised:2020/03/11

Published:2020/09/15

Design of ultra wide-band Vivaldi antenna with notch structure

LI Yong1,2, TANG Zhiling3

1.College of Engineering and Technology， Chengdu University of Technology ，Leshan  614007 ， Sichuan，China;2.Southwestern Institute of Physics，Chengdu  610041，Sichuan，China;3.School of Electronic Engineering and Automation，Guilin University of Electronic Technology，Guilin  541004，Guangxi，China

Abstract:High-speed communication systems need support from ultrawide-band antennas，then relative bandwidth and gain are the main technical indexes of UWB antenna，and how to suppress inter-frequency crosstalk is also a problem to be solved. An UWB antenna with notch structure was designed to isolate each frequency point effectively. On the basis of typical Vivaldi antenna’s structure， a triangular gap was indirectly formed by loading a trapezoidal radiating plate at the maximum opening of the antenna， so that the antenna had the property of notch. The microstrip line which was to feed was placed in the middle layer between the upper and lower radiators， and the two radiators were fed simultaneously by means of electromagnetic coupling. Simulation results showed that the range of frequency for the antenna were in 2.8 ~11.7 GHz， and the relative bandwidth was 123%.There were 6 resonance frequency points in the frequency band，then the maximum and minimum gain were 9.46 dB and 5.11 dB respectively. At the same time，6 notch frequency points 4.25，5.6，7.4 ， 9.05，10.7，12.35 GHz were generated，and they isolated each resonance frequency point. The UWB antenna had higher gain，and the problem of crosstalk in communication was solved.

Key words:ultra wide-band;Vivaldi antenna;electromagnetic coupling;relative bandwidth;notch structure

具有陷波结构的超宽带Vivaldi天线设计_李勇.pdf