| With the advancement of radio technology in the information age,radio fuze technology is developing in the direction of miniaturization,integration,standardization,high precision,strong anti-jamming capacity and strong anti-stealth capacity.As an indispensable part of fuze device,antenna has been put forward the higher request in miniaturization,high gain and wide bandwidth.In this paper,millimeter wave microstrip array antenna and ultra wideband planar antenna are studied.The main work is as follows:1.According to the microstrip antenna theory,we firstly design a rectangular radiation unit working at 35 GHz.According to the transmission line theory,we reduce the width of the radiation unit and regulate the input impedance characteristics of the radiation unit,and then design a miniaturized radiation unit working at 35 GHz which size is reduced by 42.5%.2.We design and fabricate three miniaturized millimeter wave microstrip array antennas working at 35 GHz.These planar arrays are designed through interconnecting corner fed line with the length of half of the wavelength to ensure that each unit is excited in the same phase.Otherwise we select an odd number of elements to maintain the symmetry across feed excitation.The radiating side and the non-radiating side of the patch are both connected by corner fed lines,which can decrease the size of the array and decrease the feeder loss.The size of the 3×3 array is 17.06mm(9)11.22 mm.The relative bandwidth is 2.66% and the gain is 14.7d B.The size of the 5×5 array is 27.82mm(9)19.22 mm.The relative bandwidth is 5.6%and the gain is 18.1d B.The size of the 9 ×9 array is 47.82mm(9)36.62 mm.The relative bandwidth is 4.43% and the gain is 20.6d B.3.According to the theory of cylindrical conformal antenna array,we design a horizontal omnidirectional cylindrical conformal array antenna working at 35 GHz with double-corner feeding network.The out-of-roundness of the antenna is 2.87 d B and the relative bandwidth is8.54%,the 3d B lobe-width of E-plane is 82.The energy of the antenna is concentrated on the circumference of the cylinder,which gain is between 0.44 d B to 3.31 d B in the range of the circumference.4.According to the basic principle of the monopole antenna,we design and fabricate a diamond-shaped miniaturized ultra-wideband antenna by adding stubs to the minimum current point of the radiation unit.The operation bandwidth of the antenna is from 0.5GHz to3 GHz,which is 6:1.And its size is 140mm(9)121mm,which is 62.9% smaller than the traditional rectangular monopole antenna.5.On the basis of the diamond-shaped ultra-wideband antenna,we research the ground plate of the monopole antenna by adding linear and angular stubs in sequence,finally design and fabricate a pattern improved antenna that works at 3GHz?10GHz,which radiation pattern at hf band is more stable.The E-plane patterns at any frequency within the operation bandwidth all presents a "8" shape.The size of the antenna is 42mm(9)46.5mm.6.We design an ultra-wideband radiating unit and expand its bandwidth by loading multi-level ladders on the edge of the patch.The bandwidth of the antenna is expanded from10?20GHz to 10?38GHz.Using this radiating unit as the array element,we design and fabricate a small series and double-corner fed ultra-wideband array antenna.The operation bandwidth of the antenna is from 10 GHz to 38 GHz.The size is 36mm(9)30mm and the gain is between 4.45 d B and 9.55 d B. |
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