Mechanism and solution of passive interference of shared tower to adjacent radio station

Abstract

The shared tower integrates power and communication equipment, and its new base station antenna makes the passive interference mechanism and level of transmission line to the radio station adjacent to the line change. Therefore, the passive interference mechanism of the shared tower to the station is analyzed. Compared with the traditional transmission line, the shared tower is the combination of the scatterers with discontinuous electricity, and the second-order coupling scattering will occur among the scatterers. The compound scattering field model of the shared tower under the coupling effect is established, and the scattering field under the coupling background is solved by using the equivalent principle and reciprocity theorem, so as to realize the solution of passive interference level. Taking the tower type, incident angle and antenna power of the shared tower as variables, the passive interference levels of stations with different frequencies under three factors are solved respectively, and the change rule of passive interference of the shared tower is obtained. It is suggested that the shared tower should take some passive interference protection measures for the stations adjacent to the base station antenna frequency.