顺序旋转馈电背腔圆极化天线阵列

主要描述了一种基于顺序旋转馈电网络构成的背腔式缝隙圆极化天线阵.天线单元是一种低轮廓的背腔共面缝隙天线,包括运用介质填充的金属背腔和共地共面波导构成的馈电单元.该天线单元带宽为170 MHz,最大增益为5.7 dBi,其厚度小于λ0/50.而天线阵采用2×2天线单元顺序旋转馈电的方法来实现圆极化,其阻抗带宽和3 dB轴...     

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阵设计

给出了一种新型脊波导宽边缝隙天线阵设计,天线阵被分成几个子阵形式,通过膜片的激励方式,由一个半高波导功分器馈电.设计、加工了一根16元波导天线阵,测试得到11.3%的阻抗带宽(VSWR＜1.5),天线辐射方向图最大副瓣电平低于-12 dB,具有低于-40 dB的交叉极化特性.     

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.     

低剖面双频双圆极化平板缝隙天线的设计

提出一种新型双频(Ku/Ka)双圆极化平板缝隙天线.三层平行平板构成双层的径向波导,缝隙对螺旋排布于最上层平板,低频与高频缝隙对分别逆时针和顺时针排布,对应实现右旋圆和左旋圆极化辐射.低频与高频段分别采用单根探针与多根探针的馈电形式.在组成高频径向波导的平板外围加上一圈金属通孔使低频馈电端口易于阻抗匹配.仿真结果表明:该新型双频天线在Ku和Ka频段最高的辐射效率达到60.5％和55.7％,-1 dB增益带宽分别为8.3％和6.2％,具有较宽的轴比带宽以及较高的端口隔离度,该天线具有很好的工程应用价值.     

一种高增益缝隙定向天线设计

为实现高增益低旁瓣的定向天线,设计了一种采用介质基片集成波导实现缝隙天线阵,并在辐射缝隙两边增加扼流槽,与传统的介质基片集成波导相比,大幅增加了带宽。最后实现了一介质基片集成波导天线阵,其带宽增加了8%,实际测试表明该天线具有高增益,低旁瓣,达到了设计要求。     

一种特殊波束的8mm波导缝隙阵列天线

给出了一种特殊波束的矩形波导宽边缝隙行波阵列天线的设计方法,对缝隙单元的等效阻抗、行波阵列的设计方法进行了详细讨论,阵列馈电采用三角形口面场分布克服了常规口面场分布所带来的馈电电压差别太大的缺陷,有利于工程实现.给出了16个缝隙天线的馈电电压分布及缝隙的位置.通过介质加载来提高天线E面的波束宽度.所设计的天线阵H面波束半功率波瓣宽度为10°,副瓣电平为-20.4dB,E面6dB波束宽度为210°.     

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.     

共面波导馈电小型平面超宽带天线的设计与研究

首先提出了一种新结构共面波导馈电的小型平面超宽带(UWB)天线,该天线类似一般的共面波导馈电宽缝隙天线,为了获得超宽带工作特性,设计方案中采用了叉状结构的调谐支节,并将其辐射缝隙设计为多边形;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性,然后对其时域瞬时脉冲信号保真度特性进行了数值分析。计算与实验的结果表明,该天线具有超过3.2∶1的工作带宽和全向辐射特性,而且具有较好的线性相位传输特性和脉冲信号保真度,是一种有实用意义的超宽带天线。     

Ku波段宽带平面阵的设计

在分析了单个微带圆环缝隙天线的基础上,设计和制作了一种Ku波段宽带微带圆环缝隙平面天线阵。整个天线阵分成9块进行独立设计,采用T型等分并联馈电网络单独馈电,最后利用一个圆形一分九威尔金森等分功分器连接组成天线阵总体。这种结构的平面微带缝隙天线阵阻抗带宽达到了20.56%(VSWR<2),增益达到34.5 dB,在卫星通信等领域应用前景广阔。     

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。     

Wide‐Band T‐Shaped Microstrip‐Fed Twin‐Slot Array Antenna

A numerical simulation and an experimental implementation of T‐shaped microstrip‐fed printed slot array antenna are presented in this paper. The proposed antenna with relative permittivity 4.3 and thickness 1.0mm is analyzed by the finite‐difference time‐domain (FDTD) method. The dependence of design parameters on the bandwidth characteristics is investigated. The measured bandwidth of twin‐slot array antenna is from 1.37 GHz to 2.388 GHz, which is approximately 53.9 % for return loss less than or equal to ‐10 dB. The bandwidth of twin‐slot is about 1.06 % larger than that of single‐slot antenna. The measured results are in good agreement with the FDTD results.     

一种共面波导馈电的缝隙型超宽带天线

针对超宽带通信系统,提出一种小型超宽带天线,可以应用于终端设备。天线类型为共面波导馈电的缝隙型,缝隙结构为一矩形与一圆形组合而成,馈电结构与缝隙结构相似。天线的面积为22 mm×27 mm,印刷在厚度为0. 5 mm的FR4衬底上. 通过软件仿真分析了天线的工作原理以及尺寸对带宽的影响,仿真结果显示天线的带宽在不同的衬底厚度下均能覆盖UWB频段。天线的测试带宽为2.4 GHz~14.4 GHz,在超宽带的工作频段内测试效率超过76% ,测试增益大于2.1 dBi。     

Coplanar waveguide fed wideband slot antenna

A new design for a coplanar waveguide (CPW) fed slot antenna is presented. The impedance matching and the radiation characteristics of this structure were studied using the method of moment technique. This antenna has an impedance bandwidth (for a VSWR<2) of 49% and a radiation bandwidth of 42% about its 4.8 GHz centre frequency, compared to the 12-20% impedance bandwidth of the standard CPW fed slot antenna. The cross-polarisation in both the principle planes is at least 20 dB below co-polarisation across the entire bandwidth. Simulated and measured results of the antenna are presented. This wideband antenna has significant applications in wireless technologies     

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%)     

一种共面波导馈电的圆极化天线的设计

RFID系统在当今社会应用广泛,天线在RFID系统中的作用尤其重要,圆极化天线的设计大大提高了系统的灵活性和可靠性。给出了一款通用频带的特高频RFID 阅读器天线。该天线通过共面波导馈电,在介质层顶部的接地平面刻蚀方形槽,为了增加天线阻抗带宽,将共面波导馈线弯折设计;为了提升天线的圆极化性能,在槽内适当添加L 型连接线。该天线实现了410 MHz的阻抗带宽和488 MHz的轴比带宽,天线尺寸为115 mm*115 mm*0.3 mm。     

Leaky-Wave Slot Array Antenna Fed by a Dual Reflector System

A leaky-wave slot array antenna fed by a dual offset Gregorian reflector system is realized by pins in a parallel plate waveguide. The radiating part of the antenna is composed by parallel slots etched on one side of the same parallel plate waveguide. The dual offset Gregorian reflector system is fed by an arrangement constituted by two vias and a grid, also constituted by pins. Also this feed arrangement realizes a leaky type of radiation, this time inside the parallel plate waveguide. A prototype of the antenna has been designed, manufactured and successfully tested. The low profile, low cost and high efficiency of the antenna render it suited for a variety of radar or telecom applications.     

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.     

多频段背腔式半模基片集成波导弯折缝隙天线

针对需要安装在金属平台上的天线应用,提出了一种具有定向辐射特性的新型多频段背腔式半模基片集成波导缝隙天线。利用半模基片集成波导谐振腔的多模式特性实现了该天线多频段工作,通过在谐振腔的金属顶面蚀刻弯折形状的缝隙实现对外辐射,并可以通过调整弯折缝隙尺寸参数来减小天线尺寸。仿真和测试结果表明,该天线能同时工作在5.7/10.7/11.9/12.5/13.1GHz,且在这5个频段的最低增益大于6.7 dBi。天线具有便于和平面电路集成、体积小、结构简单、成本低等优点,具有一定的工程应用价值。