Design of Vivaldi Array Antenna for Hydrogen Line Observation and Weather Radar Application

A low cost and low profile
$2\times 2$
Vivaldi array antenna is designed and developed to observe and detect the 1.42 GHz hydrogen line emission from the space. Firstly, the single element of Vivaldi antenna is designed at operating frequency of 1.42 GHz which obtains the directional pattern with the average gain around 4 dBi. To achieve high gain and decrease HPBW, the
$2\times 2$
Vivaldi array antenna is introduced and each element receives signal through 1 to 4 Wilkinson power divider. The proposed array antenna obtains 60 deg-HPBW with low side lobe level. Moreover, the average gain is around 9.5 dBi for measurement with the clear properties of linear polarization. Finally, the proposed Vivaldi array antenna is going to apply and employ as receiver for hydrogen line spectrum and also weather radar application.