本文關(guān)鍵詞：大間距相控陣天線柵瓣抑制方法研究　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大間距相控陣 柵瓣抑制 非周期結(jié)構(gòu) 優(yōu)化算法

【摘要】：本論文對工作在X波段內(nèi)大間距相控陣天線的柵瓣抑制方法進(jìn)行了研究分析。首先介紹了平面相控陣天線的柵瓣形成及規(guī)避辦法,并重點(diǎn)討論了大間距相控陣天線的柵瓣抑制技術(shù)。文中采用的大間距相控陣柵瓣抑制的具體方法為:1)對子陣級或者單元級進(jìn)行非周期結(jié)構(gòu)布陣方式優(yōu)化設(shè)計,將柵瓣能量分散;2)對有限掃描相控陣天線,結(jié)合方向圖相乘原理,采用高效陣列有源單元方向圖壓低陣列柵瓣;3)陣面子陣級不規(guī)則排布與高效饋元(或高效陣列有源單元)方向圖緊密結(jié)合,柵瓣抑制效果更為顯著。并以此設(shè)計了一些大間距平面陣布陣形式,這些陣列在抑制柵瓣、改善輻射性能方面取得了很好的效果。主要工作內(nèi)容包括:1.對大間距非周期平面八角陣布陣法進(jìn)行研究,并分析了其抑制柵瓣能力,同時陣面采用泰勒圓口徑激勵分布,以獲得低副瓣性能。在周期陣和均勻陣的輻射特性的研究基礎(chǔ)上,以規(guī)避柵瓣為主要目的,設(shè)計非周期八角陣的布陣形式�！癫捎秒S機(jī)優(yōu)化算法,優(yōu)化一種由單一子陣級組成的非周期八角陣;●采用DFP-BGFS變尺度優(yōu)化算法優(yōu)化等間距子陣的子陣中心位置,尋找一組子陣中心偏心分布;●結(jié)合陣列稀疏化原理和均勻陣無寄生柵瓣的輻射特性,設(shè)計了一種由多種等間距子陣組成的緊湊型八角陣,并通過高效饋元方向圖抑制遠(yuǎn)區(qū)柵瓣�！裱芯孔雨嚰壭D(zhuǎn)變形非周期結(jié)構(gòu)陣列,設(shè)計平面陣列排布形式,分析了其柵瓣抑制能力,其中子陣級定角度旋轉(zhuǎn)陣的柵瓣電平最低。2.對徑向等間距排列的非周期環(huán)柵陣的柵瓣抑制能力進(jìn)行研究分析。采用試探法建立了兩種陣面結(jié)構(gòu)模型:弧形環(huán)柵陣和梯形環(huán)柵陣,分析了其輻射特性;并且研究發(fā)現(xiàn)梯形環(huán)柵陣的柵瓣電平較低,出現(xiàn)位置距陣面法線遠(yuǎn)超出50°之外。3.對大間距非周期矩形平面陣的柵瓣抑制能力進(jìn)行了研究分析。優(yōu)化等間距子陣的子陣中心位置的偏心分布,設(shè)計非周期矩形布陣形式,且子陣規(guī)模越大,對寄生柵瓣的抑制越明顯。
[Abstract]:In this paper, the grid-lobe suppression method of large-spacing phased array antenna working in X-band is studied and analyzed. Firstly, the gate-lobe formation and avoidance method of planar phased array antenna are introduced. The grid-lobe suppression technique of large-spacing phased array antenna is discussed in detail. The specific method of large-spacing phased array gate lobe suppression is: 1). The optimal design of the aperiodic array is carried out at the subarray level or the element level. Dispersing the energy of the gate lobe; 2) for the finite scanning phased array antenna, combining the principle of pattern multiplication, the active element pattern of high efficiency array is used to suppress the array gate lobe; 3) the irregular arrangement of face array level is closely combined with the pattern of high-efficiency feed-element (or high-efficiency array active element), and the suppression effect of grid lobe is more remarkable. Based on this, some large spacing planar array configurations are designed. These arrays have achieved good results in suppressing gate lobes and improving radiation performance. The main work includes: 1. The method of large spacing aperiodic plane octagonal array is studied, and the ability of suppressing gate lobes is analyzed. At the same time, Taylor circular aperture excitation distribution is used to obtain low sidelobe performance. Based on the study of radiation characteristics of periodic array and uniform array, the main purpose is to avoid the grating lobe. The form of aperiodic octagonal matrix is designed. A kind of aperiodic octagonal matrix composed of single subarray level is optimized by stochastic optimization algorithm. The DFP-BGFS variable scale optimization algorithm is used to optimize the center position of the subarray with equal spacing to find out the eccentric distribution of the center of a group of subarrays. Based on the principle of array sparseness and the radiation characteristics of uniform array without parasitic gate lobe, a compact octagonal array composed of multiple equidistant subarrays is designed. By using the high efficiency feed element pattern to suppress the far region gate lobe, the subarray level rotating deformed aperiodic structure array is studied, the layout of the planar array is designed, and the suppression ability of the gate lobe is analyzed. Among them, the gate lobe level of subarray level constant angle rotation array is the lowest. 2. The suppression ability of aperiodic ring grid array with radial equal spacing is studied. Two kinds of array plane structure models are established by trial method. Arc ring grid array and trapezoidal ring grid array. The radiation characteristics are analyzed. And it is found that the grid level of trapezoidal ring grid array is low. The position distance from the normal line of the array is far beyond 50 擄. 3. The suppression ability of the grid lobe of the large spacing aperiodic rectangular array is studied and analyzed. The eccentric distribution of the center of the subarray is optimized. An aperiodic rectangular array is designed, and the larger the size of the subarray is, the more obvious the suppression of the parasitic gate lobe is.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN821.8

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本文編號：1400458