一种新型 SIW 背腔缝隙天线的研究

介绍了一种新型基片集成波导背腔六边形缝隙线极化天线。背腔缝隙天线是一种技术成熟的天线类型,但是笨重的体积限制了传统金属腔体缝隙天线的发展。基于基片集成波导结构的背腔缝隙天线以其低损耗、高功率容量、高增益 以及易集成等诸多优点而备受关注。文中设计了一款基于基片集成波导加开六边形缝隙的背腔天线,通过CST软件仿真,并制作了天线实物进行测试。天线的中心工作频率为10 GHz,增益为4. 87 dB,带宽为147 MHz。     

E波段宽带高增益透射阵天线设计

设计了一款E波段高增益天线,该天线由基片集成波导缝隙天线和透射阵组成.为实现足够的相位补偿范围,设计了多种贴片结构单元.该透射阵共有289个单元,口径尺寸为33.065 mm×33.065 mm,该天线的焦径比为0.45.实测结果表明,加载透射阵后,SIW缝隙天线的增益提高了 14.63 dB,在74.23 GHz增益...     

全向天线的组合设计

本文设计和加工了一个L波段垂直极化全向天线和S波段水平极化全向天线,通过组合设计使得天线满足安装载体要求,其中L波段采用双锥天线,实测水平面不圆度小于1.3dB,增益大于2dB,驻波小于1.4,S波段采用波导缝隙天线,实测水平面不圆度小于3dB,增益大于2dB,驻波小于1.6.两个天线上下排布,安装在一个天线罩内,天线...     

Ku波段多频高增益天线研究

针对传统平板天线频带单一,增益不高,方向性差等缺点,本文将电磁波的增强透射特性研究应用到天线的设计中,结合类f-p腔原理,设计了一款具有双频带、高增益的波导缝隙天线。天线在中心频率10.9 GHz和13.7 GHz的增益分别达到了10.8 dB和11.4 dB,并且相对于传统单缝波导天线,天线在中心频率点处E面的半波功率波束宽度分别减小了114°和90°。仿真结果和实测结果吻合度较高,尤其频带处于在Ku波段,在卫星雷达领域具有很大的应用价值。     

新型快速波导缝隙天线设计方法

对馈电网络和天线的散射矩阵进行级联,推导了互耦条件下阵列天线输入端口散射参数和天线实际激励分布的计算方法。基于该方法,提出了一种新型快速波导缝隙天线设计方法,并设计了一副12 元宽边纵缝一维波导缝隙天线。测试结果表明,在9. 82 ~10. 21 GHz 内反射系数和副瓣电平分别优于-15 dB 和-28 dB。测试结果与计算、仿真结果吻合良好,验证了该方法的准确性和有效性。     

基于波导缝隙阵列的新型太赫兹频率扫描天线

为缩短太赫兹系统成像时间,该文提出将频率扫描天线应用于太赫兹成像系统中,并设计了一种基于波导缝隙阵列的太赫兹频率扫描天线。该文采用泰勒综合法降低副瓣电平,通过软件仿真结合功率传输法设计最优的缝隙分布。太赫兹波导缝隙阵列天线具有加工简单、成本低的优势,通过太赫兹准光测试系统对天线性能进行测试,实测天线扫描角度可达40°,增益约为15 dB,副瓣电平抑制优于–20 dB。测试结果表明太赫兹波导缝隙天线具有扫描角度大和副瓣低的优良特性,在太赫兹成像和目标探测等领域有巨大的应用价值。      

基于基片集成波导的Ka波段毫米波缝隙天线设计

本文总结了由基片集成波导(SIW)设计缝隙天线的一般方法,并设计了一款 8×8 SIW 缝隙天线阵列。 该天线主要由SIW 馈电网络、缝隙阵列和微带线至SIW 转换器三部分构成。 利用泰勒分布函数控制阵列的馈电幅度以及缝隙的偏置距离,从而有效地控制了阵列在方位面和俯仰面的旁瓣电平。 实验结果表明,该天线在 33. 30 GHz ~ 36. 54 GHz 的频带范围内 S11 幅值小于-10 dB,相对带宽为 9. 3%。 天线最大增益为 18. 56 dB,H 面副瓣电平小于-20 dB,E 面副瓣电平小于-18 dB。 该天线剖面低,易于共形,在机载、弹载等场景中有较好的应用前景。     

一种新型双频全向基片集成波导螺旋缝隙天线

将基片集成波导技术和平面螺旋天线技术结合,提出了一种新型双频全向基片集成波导螺旋缝隙天线。在其它条件一样前提下,采用基片集成波导结构的天线和没采用该SIW结构时相比,天线增益在低频段1.7～1.87GHz增益基本一样,在高频段2.4～2.9GHz有SIW结构的增益提高了1.1～3.5dB。仿真和测试结果表明,经优化设计后的天线在S11小于-10dB时的工作频带为1.705～1.865GHz和2.321～2.646GHz。该天线在垂直于天线基板的平面内具有全向特性,具有重量轻、低剖面、高增益、易于和平面电路集成等优点,可以用于同时接收移动通信信号和无线局域网信号。     

一种高增益5G毫米波缝隙天线的设计

为了满足第五代移动通信的高速率工作要求,设计了一种应用于5G毫米波的高增益宽带基片集成波导缝隙天线.通过在基片集成波导腔体内刻蚀双倒"L"和"十"字型缝隙,实现天线谐振工作频率为28.07 GHz,回波损耗S11≤-10 dB工作带宽达到4.36％(27.38～28.60 GHz),中心工作频率处增益为9.42 dBi...     

共面波导馈电矩形开口振子缝隙天线

为了展宽平面缝隙天线的带宽,设计一种X波段共面波导馈电的矩形宽缝隙振子天线,该天线是在缝隙振子天线的两端开矩形开口,与振子天线形成组合结构。使用高频仿真软件对设计的天线进行仿真分析,结果表明组合结构的天线性能比单一的振子缝隙天线或宽缝天线有大幅度的改善和提高。分析了天线主要参数对天线回波损耗的影响,并在带宽最优的条件下给出一组参数值,此时天线的-10dB带宽为41．14％（7．24～10．99GHz）,增益为7．5dB,在所计算的带宽频率内有较稳定的方向图和良好的交叉极化特性。     

W波段双极化单脉冲天线设计

为了探测目标的极化特性,研制了工作在W波段的双极化单脉冲卡塞格伦天线.天线由主反射面、副反射面、馈源喇叭、正交模耦合器及和差器组成.天线主反射面口径为137 mm,馈源为五喇叭形式,正交模耦合器采用渐变波导匹配方案,和差器通过平面型定向耦合结构实现.通过将馈源喇叭、正交模耦合器及和差器集成设计,减小了连接损耗,压缩了天线纵向尺寸.测试结果表明,天线驻波带宽约3. 7 GHz,极化隔离度优于35 dB,和波束增益大于37. 9 dBi,副瓣电平优于-15 dB,差波束零深优于-25 dB.天线在W波段实现了较好地双极化单脉冲性能.     

A multielement high power monopulse feed with low sidelobe and high aperture efficiency

A multielement high power monopulse feed was investigated for excitation of a phased array. This feed has the advantages of high antenna efficiency, effective independent sidelobe control for the sum and difference patterns, and high power handling capability. A 32-element device has been designed which yields theoretical sidelobe levels less than -31 dB for both the sum and difference patterns over the 2800 to 3200 MHz frequency band. The aperture efficiency is 69.5 percent which includes 0.1 dB spillover loss and 1.40 dB tapering loss. The difference slope efficiency defined as the actual slope gain over the maximum possible value is 50 percent at midband. An experimental feed was constructed to verify the predicted performance characteristics. Measured data on both the radiation patterns and the antenna gain agreed very Well with the analytical results. The measured sidelobe level is below -30 dB for all sum and difference beams over the 2800 to 3200 MHz. In addition, this feed can be designed for low power intensity at the feed aperture so that very high power operation can be attained.     

一种Ka频段高效率圆极化宽角扫描波导缝隙相控阵天线

该文提出一种新型小尺寸、低剖面、“f”字型波导缝隙圆极化器,高度仅1/6波长,宽度约2/5波长。基于该圆极化器,设计了一种高效率、低剖面、圆极化脊波导缝隙线阵天线。为满足空间应用中对轻质、高效率、圆极化、±60°宽角扫描相控阵天线的需求,采用该线阵天线作为阵元设计、仿真并实现了16阵元Ka频段脊波导缝隙相控阵天线。仿真和实测结果表明,该相控阵天线可实现1维±60°宽角扫描。在扫描角范围内,相控阵天线的轴比小于4.1 dB,增益下降小于4.3 dB。在0°扫描角工作时,天线的实测增益为35.9 dBi,辐射效率接近85%。     

Circularly polarized dielectric-loaded planar antenna excited bythe parallel feeding waveguide network

A new receiving planar array antenna for DBS (direct broadcasting satellite) is proposed. The element antenna is a short waveguide aperture mounted in the ground plane, loaded with a dielectric and polarizers, and excited through its side wall by another feeding rectangular waveguide. The gain of the element antenna loaded with a dielectric is so high that the grating lobes can be reduced sufficiently even if the element spacing in the array is wider than the wavelength in free space. Therefore we can reduce the number of the array elements, and parallel feeding by the low loss waveguide network can be feasible to provide a planar array antenna. This paper describes the experimental results of several kinds of the circularly polarized dielectric-loaded element antennas and the planar antennas fed by the waveguide network. In the 12 GHz band the planar antenna with 64-element radiators has a maximum gain of 31.9 dBi with an aperture efficiency of 94.7%, the 1 dB-down frequency bandwidth of the gain is about 800 MHz (6.7% for a center frequency of 11.85 GHz), and the frequency bandwidth of the axial ratio is less than 1 dB of 850 MHz (7.2%)     

Design of a wideband miniature dielectric-filled waveguide antennafor collision-avoidance radar

This article presents a theoretical and experimental study of the design of a miniaturized wideband dielectric-filled waveguide (DFW) antenna. The operational frequency is X band, i.e., 9.0⩽f⩽10.5 GHz. The desired bandwidth is 1.5 GHz. The antenna uses an air-gap matching network to reduce its high aperture reflection. In order to ease the integration with antenna circuits and to increase the bandwidth, two E-plane steps are used. The antenna is designed to have -3 dB beamwidths of 60° and 100° for the E- and H-plane patterns, respectively. An input reflection of less than -10 dB for the desired bandwidth is observed. The gain of the antenna is 7 dBi. A cross-polar level of less than -25 dB is achieved. This article discusses the mathematical model for input reflection, the design scenarios, and the experimental results     

A planar slot array with four independent beams

Active Doppler velocity sensors require an antenna system that generates three or more independent beams. A four-port dual-mode antenna that generates four independent beams from a single aperture is described. The signals emanating from the four ports generate four beams in space through a common aperture of crossed slot radiators. Isolation between the four signals processed through the antenna is obtained primarily by utilizing the mode isolation that exists between theTE_{10}andTE_{01}modes in square waveguide. The isolation obtained between ports was 27.5 dB or greater. The special design problems and the effect of dimensional tolerances on the port isolation are discussed. A gain of greater than 30 dB for each beam and an overall antenna efficiency of approximately 71 percent were achieved. The beam pointing directions ranged from 27 to 29 degrees from the normal to the aperture. Sidelobes of 15 dB or better were also obtained.     

共面波导馈电蝶形开口振子缝隙天线

讨论了共面波导(CPW)馈电蝶形开口振子缝隙天线。在缝隙振子天线两端加入蝶形开口结构,形成振子蝶形组合结构天线。使用有限元仿真软件(Ansoft HFSS)分析了设计的天线,结果表明组合结构天线具有振子天线与蝶形天线的优点:蝶形天线的宽带特性与振子天线的高增益特性,整个天线的性能得到提高。使用了两种馈电方式:感性耦合和容性耦合,感性耦合时组合天线的带宽特性较好,从振子天线5.9%提高到10.32%;容性耦合时增益特性较好,从振子天线的3.19dB提高至6.27dB。分析了衬底厚度对天线的影响,衬底厚度的增加使谐振频率降低,但对天线带宽的影响不大。     

Broadband printed circularly-polarised aperture antenna array for millimetre-wave gigabit applications

A simple and successful design of a printed aperture antenna array is presented in view of high-speed millimetre-wave wireless access applications. The antenna element design is based on a broadband travelling- wave aperture antenna for circularly-polarised radiation. For the antenna array design, the sequential rotation scheme is employed for improving the co-polarised gain and axial ratio. The presented antenna array is designed in the 40?48 GHz band and implemented with a 5mil-thick RT/Duroid-5880 PCB. Promising performances are achieved, including a return loss (,10 dB) bandwidth of 32%, an axial ratio (,3 dB) bandwidth of 25%, and a co-polarised gain (flatness , 3 dB) bandwidth of 32% with a maximum gain of 11dBic.     

Variations in the frequency sensitivity of waveguide horns

Rectangular horns have extra parameters, when our only requirement is to design to a particular gain. We can use these to improve the design in various ways. The author has designed horns with a maximally flat frequency response. To achieve this goal, it is necessary to consider the slope of the phase-error loss. When the sum of the phase-error slopes in the E plane and H planes of the rectangular-aperture horn equals 6 dB/octave, the antenna-gain response is flat. The rate of change of phase-error loss equals the 6 dB/octave rate of increase with frequency of an aperture antenna. The article goes beyond the maximally flat frequency response to help the designer find parameters for any reasonable frequency-response gain slope