Implementation of multi-frequency multiple-pass antenna systems design methodology for linear radio centers of professional mobile radio networks

Based on the analysis of the requirements for modern mobile radio networks, the design method was developed for designing multi-frequency multiple-pass antenna systems for linear radio centers. The design method includes the choice of implementation options, design of a radiating system, development of a beamforming scheme and a matching device. An antenna system has been designed using this method. The aforementioned antenna consists of two circular antenna array tiers with antenna elements of the type of a log-periodic antenna synthesized for diff erent subbands. Experimental studies of multi-frequency emitters for multi-pass antenna systems of linear radio centers were performed. The obtained results of experimental studies lead to the conclusion that characteristics of the antenna array designed using the presented method correspond to the specifi ed technical requirements, which, in turn, indicates the effi ciency of the method for multi-frequency multi-input antenna systems design.