Synthesis of a Dual-Band Circular Polarization Antenna for Global Navigation Satellite System GLONASS

A topology of a printed dual-band circular polarization antenna for receiving GLONASS L1 and L2 signals is proposed. The antenna consists of two radiating webs and a signal adder made on the same substrate in one technological cycle, the combination of signals is provided by a Wilkinson adder. The emitters are made in the form of printed resonant antennas with circular polarization. Circular polarization is provided by a phase-shifting loop. The electric field intensity vector rotation direction is determined by the side of the square to which the phase-shifting loop is connected. The article presents the geometric dimensions of the antenna for the FR4 material, if it is necessary to reduce antenna size, the material can be replaced with a more expensive one with a higher relative permittivity. The results of measuring the reflection coefficient modulus of the prototype antenna are presented. Mathematical modeling of the developed antenna is carried out and comparative results of modeling and experimental sample are presented.