Side lobe reduction in array antenna by using novel design of EBG

Abstract

<p>A novel design of EBG is used to replace the mushroom like EBG for surrounding the array patch antenna. In order to improve its radiation performances, Electromagnetic band stop for reducing the surface waves effects is presented. The novel design of Triple Side Slotted EBG (TSSEBG) showed an improvement in the antenna efficiency, directivity and gain as compared to the reference antenna without using EBG, due to reduce the surface waves effects which leads to decrease the side lobes. TSSEBG has been introduced by some modifications in conventional mushroom-like EBG structure. Reducing the complexity was achieved by reducing the number of unit cells and vias, in case of used TSSEBG instead of mushroom like EBG. Additionally, the TSSEBG provided triple band gap compared with mushroom like EBG structure which had only one band gap frequency at 6 GHz. The placement of TSSEBG is a flexible structure which provides a good choice in the antenna applications. The simulation results of array patch antenna with and without mushroom like EBG and TSSEBG are arranged in Table 1. This structure has vast applications in satellite communications.</p>

Generation of OAM Waves and Analysis of Mode Purity for�G燬ub-6燝Hz燗pplications

“…12. The gain is lower for UCA-2 because of the side lobes [25] since the array radius for UCA-2 is 84 mm while the radius is 73 mm for UCA-1. This increased array radius size will narrow the main lobe beam width and increase the side lobe radiation [26].…”

Wideband characteristics of density tapered array antennas

“…In a present mobile base station antenna, an equally spaced linear array configuration is employed as shown in Figure 1(a). Low sidelobe characteristics are achieved by giving adequate excitation coefficients (amplitude and phase) to array elements [5][6][7], and/or changing the radiation characteristics of elements in the array [8,9]. In case of providing excitation coefficients to all elements, feeding network includes multiple power dividers and feeder lines that have different values [10][11][12].…”