共查询到19条相似文献,搜索用时 140 毫秒
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一、引言波导裂缝天线阵已在许多要求窄波束或赋形波束方向图的微波通信和雷达中获得了广泛的应用,特别适用于要求重量轻和小的扫描空域的机载设备。这种天线可采用窄边开缝或宽边开缝的谐振或非谐振阵。原图1(略)中的天线是个典型的例子,其中辐射缝为偏离波导中心的宽壁裂缝。它还利用宽壁斜缝从低功率电平波导中把射频能量耦合至宽壁开缝的馈电波导。典型的波导裂缝阵在设计过程中,首先是按要求决定阵的尺寸、开槽型式、馈电方 相似文献
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提出了一种新型波导口单脉冲天线阵设计,分别给出了驻波曲线和辐射方向图的测试结果。该天线辐射单元采用呈90°结构的小型化波导口形式,通过底部的馈电倾斜缝馈电实现阵面的锥削分布要求,克服了传统波导缝隙天线设计复杂及对加工精度要求高的缺点,实现较为简单。采用理论与实验相结合的方法分析了测试结果与仿真结果差距较大的问题,去除了较为敏感的短路块结构,综合考虑工程可实现性及电性能两个方面,对辐射单元进行了二次优化设计并完成了天线实物加工。实验结果表明,该天线具有2.7% 的带宽(驻波不大于2),-20 dB 副瓣性能和45%的辐射效率,实现了与传统波导天线相当的单脉冲性能,为波导天线设计提供了一种新的方法,在弹载星载领域具有较广泛的工程应用前景。 相似文献
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单脉冲平面缝隙阵列天线设计和误差分析 总被引:2,自引:0,他引:2
文中介绍由波导宽边纵向缝隙构成的单脉冲平面阵列的设计方法,给出具体阵列天线的设计结果。以14×14元平面阵列为例,分析单脉冲阵列天线主要组成部分的误差对天线性能的影响。计算分析了缝隙位置与长度的加工数据的误差,馈电(和差器)的幅度、相位误差,馈电缝阵的误差,以及工作频率等对方向图的影响。文中计算和分析结果与实验结果吻和较好,误差分析结果可作为该类天线对加工公差要求和实验分析的依据。 相似文献
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扁波导馈电的平板缝隙天线阵,除了馈电波导内部耦合增强以外,带宽也受到限制.文章从谱域角度分析了缝隙天线的内外场分布,在此基础上,得到了周期波导和金属波导中各模式场的功率/储能谱.计算了波导缝隙天线的Q值并分析其变化规律,解释了扁波导馈电带宽受限的原因是辐射波导内的驻波储能场增强造成的.提出了在缝隙两侧增加扼流槽的改进方案,并同样从谱域的角度分析了该方案对带宽改善的影响.将该方案应用于一个实际的SIW平板波导缝隙天线阵设计中,获得了8.1%的带宽. 相似文献
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该文研究了4种共面波导耦合缝对单贴片微带天线的谐振频率以及带宽的影响,并利用天线近场分布对其进行解释;分析并比较了几种耦合缝的馈电特性,极大地提高了天线设计的灵活性;运用变频思想对馈电装置进行改进设计出了一阻抗带宽达28.9%的宽频带天线,在3.76~4.80GHz的工作频段内天线增益均大于8dBi,增益带宽达24.2%。 相似文献
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本文介绍了正交波导侧端壁双缝耦合多路功分器作为平面相控阵天线的馈电系统的设计方法,以及在一维相扫波导裂缝阵天线以及两维相扫波阵天线中的应用实例。 相似文献
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The Elliot procedure for the design of a waveguide slot array is extended to the case of partially filled radiating waveguides. The dielectric slab lies on the top of the radiating waveguide, i.e. on the slotted wall. The proposed solution prevents some of the most common drawbacks of waveguide slot arrays. Results are validated against a commercial FEM software. 相似文献
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波导窄边斜缝线阵的分析 总被引:3,自引:1,他引:2
本文给出了分析波导窄边互耦斜缝列的矩量法,对比了相同五单元模型(单缝元及紧耦合双缝元)S矩阵频应的实测值与计算值,对比了68单缝元线阵的方向性,结果表明本法较为精确,可用以分析长列阵的特性,为优了设计打下基础。 相似文献
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在小型波导缝隙阵设计中,采用匹配缝隙是减少终端损失、提高天线效率的关键技术之一。本文给出了矩形波导终端匹配缝隙对的分析。该缝隙对是由波导宽壁上的纵缝和横缝构成的。基于等效原理和并矢格林函数建立了缝隙对的耦合积分方程组,然后作数值求解。计算了缝隙对的反射特性与辐射特性,给出了缝隙对口面电场的幅值和相位以及波导驻波比随缝隙长度和频率的变化曲线。本文的计算结果可用于圆极化波导缝隙阵的设计 相似文献
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Akiyoshi Mizutani Kunio Sakakibara Nobuyoshi Kikuma Hiroshi Hirayama 《Antennas and Propagation, IEEE Transactions on》2007,55(2):313-320
A high-gain and high-efficiency slotted waveguide planar antenna is developed in the millimeter-wave band. Forty-five degree inclined polarization is required for automotive radar systems. In the design of slotted waveguide array for arbitrarily linear polarization, slot spacing is one guide wavelength which is larger than a wavelength in free space. Consequently, grating lobes appear in the radiation pattern. So, we developed a slotted waveguide planar antenna composed of post-loaded narrow-wall slots and a single-layer alternating-phase feeding circuit. A planar antenna with suppressed grating lobes has been fabricated and its RF performance has been measured. The measured gain is 33.2 dBi and antenna efficiency is 56% at 76 GHz. Grating lobe level is -28.6 dB lower than main lobe level. Since the proposed structure remains simple, the antenna is expected to be manufactured by metal injection molding for low cost 相似文献
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Sehyun Park Tsunemitsu Y. Hirokawa J. Ando M. 《Antennas and Propagation, IEEE Transactions on》2006,54(5):1474-1480
A center feed configuration is newly introduced to enhance the bandwidth as well as to suppress the frequency dependent beam squinting in single layer slotted waveguide arrays. A multiple-way power divider consisting of cross-junctions is installed at the center of the aperture in an alternating-phase fed waveguide slot array to reduce the long line effect in the radiating waveguide. Each radiating slot is equipped with an inductive wall for reflection canceling, which dispenses with the beam tilting technique for suppressing cumulative reflection and assures the boresight beam. All these are equipped in single layer and are potential for low cost mass-production as is usual the case with alternating phase-fed arrays. The test antenna is fabricated at 26GHz band for FWA system. A 30.5 dBi gain with 46% efficiency with the main beam staying in the boresight is obtained. The sidelobes of -9.5 dB associated with the aperture blockage for the center feed is suppressed to below -14.7 dB at the design frequency, by applying a genetic algorithm for controlling the slot excitation. 相似文献
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Malherbe J. Cloete J. Losch I. Robson M. Davidson D. 《Antennas and Propagation, IEEE Transactions on》1984,32(12):1341-1344
Measurement procedures for obtaining the self-impedance of an isolated inclined radiating slot in the metal wall of a nonradiating dielectric (NRD) waveguide are discussed. The design procedure for an antenna array fed by NRD-waveguide and making use of this information is described. As an example, the design, construction and evaluation of a ten-element input-matched broadside linear array is described. 相似文献
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为减小波导窄边裂缝天线缝隙间互耦对天线性能的影响, 实现低副瓣的设计, 提出了一种倾角波动分布的设计方法.天线电流分布选用泰勒分布, 利用HFSS软件确定缝隙倾角初值, 在此基础上得到波动分布的倾斜角度, 并通过遗传算法对缝隙倾角进行优化.使用Matlab与HFSS软件联合仿真, 省略了建模、设置参数等大量操作, 提高了设计效率.基于此, 设计了一款长度为1.2 m的X波段波导窄边裂缝天线, 仿真发现副瓣电平比传统设计方法低2.17 dB, 加工了天线实物并进行了测试, 天线实测增益和副瓣电平分别为20.9 dBi和-28.7 dB, 验证了方法的有效性. 相似文献