扁波导馈电的平板缝隙天线阵的带宽扩展

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.     

共面波导馈电的新型微带缝隙天线

本文介绍一种共面波导馈电的新型微带缝隙天线。通过选择正方形缝隙形状和对共面波导与辐射缝隙的连接区域进行渐变，有效地展宽了缝隙天线的阻抗带宽，实验天线的-10dB反射损失带宽达40％。文中对不同渐变形式下的天线特性进行了研究。仿真结果与实测结果吻合良好。     

宽带单脊波导缝隙天线的设计

根据传输线方程推导了单脊波导辐射缝隙有源导纳的计算公式,结合三维电磁仿真软件HFSS提取了天线阵列中辐射缝隙的有源电导,设计了一个8元单脊波导缝隙线阵,实测结果表明,副瓣为-23.61dB,VSWR≤2时的相对带宽为8%,约为矩形波导缝隙天线的2倍。     

一种展宽波导缝隙天线带宽方法的研究

采用矩量法分析了缝隙宽度对窄边压缩型波导缝隙天线的导纳随频率变化的影响,得出了窄缝带宽特性优于宽缝的结论.结合波导缝隙天线的设计方法分析了有源导纳的带宽特性,并给出了一种宽缝、窄缝混合排列的新型宽带结构,仿真结果证明了该方法的准确性和有效性.     

波导缝隙谐振阵带宽与缝隙特性关系研究

该文结合波导缝隙天线等效电路和辐射缝隙导纳特性,分析了并联辐射缝特性对波导谐振阵方向图带宽的影响,推导出天线方向图理想带宽所需要的缝隙特性.该结果为展宽谐振阵带宽提供了一种思路,为宽带波导谐振阵的设计提供有益参考.     

基于EBG结构的波导缝隙天线RCS减缩研究

波导缝隙阵列天线具有结构紧凑、性能稳定等优点被广泛应用于雷达及卫星系统中,然而该天线会产生较强的雷达散射截面。文中采用在波导缝隙阵列天线上放置开槽的EBG结构,对其RCS减缩进行了研究。结果表明,在不影响天线辐射特性的情况下,加载该EBG结构可以有效地减缩波导缝隙天线的RCS。     

矩形波导窄边倾斜缝隙天线阵的设计

介绍了一种矩形波导窄边斜缝泰勒线阵设计的方法.简要阐述了矩形波导窄边缝隙天线阵列的相关理论,并使用HFSS软件对单个缝隙结构,无限阵列环境下缝隙单元的导纳参数进行数值仿真.然后按照仿真获得的等效谐振电导曲线,运用泰勒线元法综合求出非谐振式48元波导窄边缝隙线阵,并对整个线阵进行了仿真和实测.仿真和实测结果表明,该天线阵列具有低副瓣、宽带宽、高增益等特点,并且实测结果与仿真吻合良好.     

W波段宽带SIW背腔缝隙天线

W波段（75~110 GHz）的电磁波大气吸收率低、波长短、可用频带宽,在雷达、通信等领域应用广泛.文章设计了一种W波段基片集成波导（substrate integrated waveguide,SIW）背腔缝隙天线,-10 dB的阻抗带宽达到28.6%（78.93~105.24 GHz）,覆盖了W波段75%的频带范围.天线采用双层基片结构.上层为SIW谐振腔及四条辐射缝隙构成的谐振辐射单元,谐振腔内同时存在TM₁₃₀与TM₃₁₀混合模、TM₃₂₀模以及TM₃₃₀模三种高次模,和辐射缝隙一起形成多谐特性,实现带宽拓展;底层为通过耦合缝隙馈电的集成波导,易于扩展成平面网络,构建高增益背腔缝隙天线阵列.该天线频带宽、交叉极化低、剖面低、易于与平面微波电路集成、加工成本低,具有良好的应用前景.     

基于缝隙波导的多频微波加热研究

微波因其高效、绿色无污染等优点在加热领域应用广泛,但加热均匀性差限制了它的进一步发展。本文基于波导缝隙天线理论和磁控管的非线性响应特性,设计了一个以波导缝隙阵列天线为辐射器的加热系统。利用磁控管的非线性响应特性输出多个频率的微波以丰富电磁场的模式,设计了基于横向缝隙波导和纵向缝隙波导的两种辐射器,建立了微波加热的多物理场模型,以模拟多个频率的微波通过缝隙波导加热物体的效果,并分析了不同参数如缝隙、频差等对加热均匀性及效率的影响。     

基于电调超表面及柱面反射面的相控阵天线设计

提出了一种基于电调可重构超表面的低成本相控阵天线.该天线结构由天线底部的抛物线反射面馈电网络、上层的波导缝隙阵列及在波导中加载的电调超表面3部分组成,通过抛物线反射面将馈源在天线下层平板波导中产生的柱面波转换为平面波并用来激励天线上层的波导缝隙阵列.为了实现低成本的波束扫描,在每条独立的波导缝隙天线前端加载了具有360...     

Experimental Study of a Slot Antenna Excited by a TE011 Mode Coaxial Cavity

A slot antenna is developed to excite the high harmonic waveguide mode for generating large-area plasmas. This antenna consists of a TE₀₁₁ mode coaxial cavity with the axial slots positioned on equal interval on the inner wall. The waves radiated from those slots can excite the high harmonic mode in the central area. With the azimuthal symmetric wave field of the TE₀₁₁ mode, the number of the slots can be chosen to match the field pattern of the high harmonic mode. In this report, the dispersion relation of the coaxial waveguide, the coupling scheme and the mode competition of the cavity are studied. A method has been successfully developed to suppress the TE₁₂₁ mode which is the most competing mode to the TE₀₁₁ mode.     

波导窄边缝隙阵列天线的分析与设计

波导窄边缝隙阵列天线由于效率高、功率容量大、稳定性好及副瓣电平低等特性,在雷达体制上使用广泛。对于单一波导窄边缝的隙线阵,根据设计指标,首先分析其理论模型并给定理想的设计参数,再利用Ansoft公司的HFSS软件的参数扫描及优化功能,通过局部调整设计参数就可以方便地得到缝隙的谐振结构。利用这种设计方法可以快速得出所需要的低副瓣窄边波导缝隙阵列天线。     

Reduction of Azimuthal Amplitude Ripple in the Rotating-Mode Feed to a Radial Waveguide by Using a Crossed Dog-Bone Slot

The use of a crossed dog-bone slot in a rectangular-to-radial waveguide transformer is proposed as a feeder for a radial line slot antenna to reduce the amplitude ripple in the azimuthal direction because the beamwidth of the dog-bone slots is wider than that of straight slots in radiating into a radial waveguide. The transformer is analyzed and designed by using the method of moments with numerical eigenmode basis functions. By the use of the crossed dog-bone slot, the measured amplitude ripple in the azimuthal direction becomes 0.80 dB, which is 1.4 dB lower than that of the conventional crossed straight slot in the 5.8 GHz band.     

Triple broadband compact planar inverted F antenna for WLAN and WiMAX

This article proposes a novel antenna structure by slot loading method based on the planar inverted F antenna(PIFA),which is fed by coaxial probe.The antenna structure consists of a new and flexible slot array including five slots.To reveal the mechanism of slot loading in creating new and broad frequency band,the article discusses the performance of the five slots in detail.Simulations with Ansoft HFSS 10.0 indicate that the -10 dB relative impedance bandwidth can reach 17.2 %,8.9 % and 12.1 % that covers ...     

Aperture Coupled Rectangular Dielectric Resonator Antenna Array Fed by Dielectric Image Guide

This paper presents the design of a rectangular dielectric resonator antenna array coupled to narrow slot apertures that are fed by dielectric image guide (DIG). The DIG is excited by an X-band rectangular waveguide through a waveguide transition, and DIG tapering is used to match between the waveguide and the DIG. Reflection cancelling slots are added near the original slots to improve impedance matching. Since the slots radiate in both directions, a reflecting conducting plate is inserted above the DIG to decrease the back radiation of the antenna. The antenna is fabricated and the measured results are compared to the simulated results.      

Coaxial multi-slot antenna for mobile terminals in LEO-MSAT

A novel coaxial slot antenna is proposed for satellite mobile communications. It uses five circumferential slots with optimised positions to achieve an upward-skewed main-beam for satellite tracking. The radiation pattern and gain and return loss of the slot antenna are discussed. The antenna has the advantages of high gain, high efficiency, low-cost and ease of fabrication     

一种新型矩形波导裂缝天线的分析与设计

针对任意两个横缝位于馈电矩形波导终端的短路圆盘上的情况.本文运用伽略金方法分析了一种新型双裂缝天线的反射与辐射特性:分析中考虑了缝隙间的内部互耦与外部互耦:根据分析结果,首次设计并研制了这种工作于C波段的新型天线,实验结果和设计指标吻合较好.它适合高速飞行器载体的特殊应用.     

波导终端缝隙对的分析

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     

Radiation characteristics of dielectric-coated coaxial waveguideperiodic slot with finite and zero thickness

The leaky wave radiated from the dielectric-coated coaxial waveguide periodic slot with finite and zero thickness is investigated theoretically for the infinite and finite periodic structures. For the infinite periodic structure, mode-matching technique and integral equation method are applied to the analysis of finite and zero thickness slot cases, respectively. The integral equations are derived for the finite periodic structure by use of the Fourier transform and mode expansion and simultaneous linear equations are obtained. The effects of the slot thickness, the finite slot number and the dielectric coating are analyzed. Results for finite periodic slots are compared with those of the infinite extent structure and good agreement is found     

一种计算波导耦合缝隙有源阻抗的方法

 针对耦合波导缝隙馈电时波导内电磁场复杂且不利于工程应用的问题,提出一种耦合波导缝隙有源阻抗计算方法.根据耦合波导端口处S矩阵与端口处输入阻抗矩阵的关系建立关于耦合波导缝隙有源阻抗方程,且采用牛顿法求解此非线性高阶分式方程,得到计及缝隙间互耦的耦合波导缝隙有源阻抗值.通过提取HFSS软件中耦合缝隙馈电的裂缝天线S矩阵进行仿真计算,结果表明该计算耦合缝隙有源阻抗的方法是有效的且适合大型裂缝天线耦合裂缝设计.