The paper presents a technique for analyzing the electrical characteristics of series-type collinear antennas made according to the Franklin scheme, which are intended for use in radio communication systems with moving objects as basic or subscriber antenna-feeder devices. Collinear antennas belong to omnidirectional type antennas and allow to significantly increase the amplification factor in comparison with already existing types of antennas of a similar type, which is what attracts antenna technology developers today. The main element of a series-type collinear antenna is a phase-shifting device that determines both the performance of the antenna and its electrical characteristics. The most widely used phase-shifting devices were inductive chokes – a section of conductor of a certain length rolled into a spiral. The proposed engineering method of calculating the parameters of the inductive choke allows you to quickly and accurately adjust its characteristics with the calculation of the necessary phase shift. This approach takes into account the physical parameters of the conductor material and the geometry of the spiral conductor, which greatly simplifies the engineering process of developing collinear antennas. The obtained results of simulation of electrical characteristics confirm the effectiveness of the proposed method. A significant increase in the amplification factor compared to the existing types of antennas and compliance of the electrical characteristics with the specified parameters was revealed. The work has an important contribution to the development of antenna technology and has practical application in radio communication systems with moving objects. The proposed method of calculating the parameters of the inductive choke can be used by antenna developers to increase the productivity and efficiency of their radio communication system.
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