Accordingly, to overcome the path loss in 5G mobile communication system, minimmum value of 12 dB gain is required 22. Moreover, regarding the Ferris equation, the path loss become higher as the frequency increases. All of these antennas have end-fire patterns and acceptable measurmant performance but are not applicable in 5G systems due to low gain values as the single element. The details of the design procedure for each of the single elements and the results (simulation and fabrication) of them are reported in 21. The dimension of antenna1 according to Fig. The simulation results by CST and HFSS show reasonable agreement for reflection coefficient and radiation patterns in the E- and H- planes. To guarantee the simulation results, one of the proposed structures is fabricated and measured (namely the characteristics of S 11, E-, and H-plane patterns) which shows acceptable consistency with measurement results. The feeding network for array is an eight way Wilkinson power divider (WPD). The structure of feeding parts is the same but the radiation elements are different. The proposed antenna arrays consist of eight single elements. In this paper three different multi stub antenna arrays at 27–29.5 GHz are designed.
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