Abstract-Dual-polarized antenna is widely used in communication systems such as ECM and DF systems. In this paper a novel doubleridged horn antenna with dual polarizations is introduced for frequency range of 8-18 GHz. Common double ridged horn antennas have single polarization over the operating frequency. We have used five layers polarizer to provide dual polarizations performance of the doubleridged horn antenna.In order to achieve dual polarizations the strips width, strips spacing and layers distances are optimized. It is worth mentioning that the corresponding VSWR of the antenna during the optimization process should be maintain below a certain value (VSWR < 2).Simulation results show that the proposed antenna yields dual polarizations performance and low VSWR over the operating frequency. We have used CST software for antenna simulation which is based on the finite integral technique.
A new technique based on the invasive weed optimisation (IWO) algorithm and geometrical optics (GO) method for synthesising broadband cosecant‐squared pattern reflector antennas is presented. The main feature that distinguishes this technique from others is the wide bandwidth. Moreover, compared with the previous methods, the proposed method allows to obtain extremely smaller ripples in the shaped region and lower sidelobe level (SLL). To achieve the desired performance over the entire 18–40 GHz operational bandwidth, the reflector surface is synthesised using a complex and accurate frequency‐dependent fitness function including optimum weighting values. The simulation results via FEKO software package further prove the validity and versatility of this technique for solving reflector synthesis problems. In addition, experimental investigations are conducted to understand the complete reflector antenna system behaviours. Measurements show a good agreement with the simulation results. At last, the efficiency of the proposed frequency‐dependent IWO (FDIWO) method both in bandwidth and optimality of the results are compared with original IWO method, common GO method and electromagnetic radiation (TICRA) software package. Comparison results show that the FDIWO method outperforms the other techniques.
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