I. S. Baklashov, K. K. Klionovski

The paper considers the problem of the effect of multipath signal reception on the accuracy of the current position of the receivers of the global navigation satellite system. To reduce the measurement error of coordinates different shielding structure are used - a flat metal disk, impedance ground planes, choke ring and radar absorbing materials. To reduce the overall size of the screen and improving the electrical characteristics in comparison with the above screen, use the semi-transparent ground planes. Semi-transparent ground planes are characterized by the fact that the incident electromagnetic wave on the screen are not simultaneously zero reflection coefficient and transmission coefficient. The article deals with semi-transparent ground planes with capacitive and purely resistive impedance. For radiators in the form of electric dipole and microstrip antenna on a semi-transparent ground plane with a resistive impedance and the metallic shield are calculated and measured radiation pattern. Shown that semi-transparent ground plane is more strongly inhibits the reverse radiation, compared with a metal screen. Considered screens with uneven distribution profile of the impedance. Best suppression of electromagnetic radiation provides a screen with a quadratic distribution profile of the impedance. For a translucent screen with a capacitive impedance for each screen size there is an optimum magnitude of impedance at which the radiation pattern of omnidirectional source becomes tabular character in the upper hemisphere, while the ratio of DU reaches the best values. Features a semi-transparent ground plane is weakly dependent on the impedance phase, if the impedance has a capacitive character. We consider the practical implementation of a semi-transparent ground plane. Noted that further optimization of the semi-transparent ground planes is connected with the implementation of non-uniform profiles of amplitude and phase of the impedance on the surface of the screen. Also of considerable interest to study the semi-transparent ground planes with an inductive impedance.