Comparison of Helix Antennas Operated on 2.4, 5.2 and 9.2GHz for FSO/RF Hybrid System

Communication technologies have the dominant effect to human lives. We are surrounded by these technologies in personal and professional lives too. Digitalization sets the trend in all these areas. Communication technologies easy the fulfillment of our tasks in professionals areas and open the next door of possibilities of spending our free time. Responsibility that was on human, is today directly on end devices. The expansion of these technologies is so significant that it has almost negative impact on human lives. In many cases, we are slaves of technologies. Requirements of users on availability of communication technologies are still growing and we have to offer the solution. Optical fiber communication systems create the backbone of high speed communication systems. We are focused on using optical communication systems without needs of optical fiber. Free Space Optics (FSO) systems offer comparable transmission rates as optical fibers communication systems. The main drawback of FSO technologies is sensitivity to weather changes, so we have to design appropriate radio-frequency (RF) backup link. Analysis of the appropriate type of helix antenna is the point of this paper. We designed three models of helix antennas operating on three different frequencies from non-licensed frequency range.