An L-Band Ultra Wide-Band Vivaldi Antenna with Wide Beam Angle

In this paper, a new L-band wide beam angle wide-band Vivaldi antenna is presented. To obtain a balance between the miniaturized size, the low-frequency and wide-band operation, as well as the narrow beam angle of the antenna, the structure of the traditional Vivaldi antenna was changed, and the end of the antenna curve slot is rounded to increase the electrical length and reduce the volume. In addition, the edge of the antenna radiation metal is slotted to increase the antenna beam angle. The results show that in the 1.01 GHz-2.37 GHz operating band, the antenna has good impedance matching and the reflection coefficient is lower than -10 dB. The antenna has a large beam angle with the -1-dB beam angle larger than 50° and the -3-dB beam angle greater than 90°. The antenna measurement results are basically consistent with the simulation results.