V. G. Betelin - Head of Laboratory of Receivers, Special Design Office, JSC « Ulyanovsk Mechanical Plant»
A. A. Kiselev - design engineer, Special Design Office, JSC « Ulyanovsk Mechanical Plant». E-mail: kiselyovanton@inbox.ru
G. M. Korobtsov - Head of Department of Microwave Technics, Special Design Office, JSC « Ulyanovsk Mechanical Plant». E-mail: genkor777@gmail.ru

The broadband array development drew attention to the design and construction of broadband distribution systems and aroused interest in them. An L-band distribution system combining D and VII frequency bands was elaborated to unify the identification channel antenna system. A divider implemented on a balanced stripline was chosen as a distribution system. A 16 channel fish-bone divider on the proposed line with an additional difference channel was designed. The desired amplitude-phase distribution is obtained using asymmetrical two-level ring dividers in the nods; sum-difference channels are formed using a modified hybrid ring. A synthesis technology for asymmetrical two-level ring dividers and hybrid rings based on even-odd mode method was worked out. An outline model was made using AWR Designer 9 software; the distribution system nods were optimized to get stable parameter values of the dividers, the hybrid ring and the system in general. The topology of the distribution system circuit layer was formed. Using Ansoft HFSSν12 software electromagnetic models of the designed ring dividers and the hybrid rind were created. Their parameter values were analyzed, the topology of the circuit layer was enhanced. The performed calculation, simulation and optimization allowed obtaining the distribution system characteristics satisfying all the desired specifications. Distribution system nods prototypes were produced using the simulation and development results. Models analysis and characteristics measurement have shown that the modified ring dividers are suitable for broadband distribution system design. The results obtained during the designing of the broadband insulated 16-channel power divider will be used for the development of a broadband phased array for the L-band identification system operating at the D and VII frequency bands and also for the creation of a shaped radiation pattern (of the «cosec» type).