The Research of Exciter Frequency Characteristics of a Quad-Band Antenna Based on a Corrugated Horn
The objective of the paper is to study the frequency characteristics of the exciter based on a corrugated horn for a quad-band antenna for satellite communications.The problems of the construction of the corrugated horn as the basis for the radiating system of the quad-band reflector antenna for satellite communications with overlapping of C-, X-, Ku-, and Ka-bands are considered. The conducted analysis of the interrelation of the characteristics of the multiband reflector antenna with the characteristics of the radiating system permits defining a set of the requirements to the parameters of the corrugated horn, which is the base of a radiating system.The corrugated horn, which provides the required characteristics in C-, X-, Ku- and Ka-bands, is developed.The radiation pattern of the corrugated horn within the specified bands and the frequency dependences of the mode converter providing the interface of the horn with a circular feed waveguide are analyzed. The experimental checking proved that within C-, X-, Ku-, and Ka-bands, an average value of the VSWR does not exceed 1.12, and the maximum value makes 1.15 at the frequency.