应用于引信系统的一种W波段SIW缝隙天线阵的设计

将驻波缝隙阵天线中的并联缝隙等效为微波电路,按照传输线方程推导了缝隙导纳的计算公式,用仿真软件提取了缝隙参数,拟合出了谐振缝长随偏移量的变化曲线、谐振电导随偏移量的变化曲线,设计了一个10单元的端馈的W波段SIW缝隙天线阵,具有低剖面、宽带、低副瓣的特性,满足引信天线设计的要求。     

加载SIW背腔的低剖面缝隙天线

本文提出了一种新的微带缝隙天线。通过在 SIW(Substrate Integrated Waveguide, 介质集成波导)一面地板上刻蚀矩形辐射缝隙,利用 GCPW(Grounded Coplanar Waveguide)馈电,实现了微带缝隙天线的单向辐射。对比传统的带四分之一波长反射板单向辐射缝隙天线,该天线实现了极低剖面(天线厚度仅为 0.029λ₀ )。文章详细分析了该类型天线的辐射原理和天线结构参数对谐振频率的影响。     

加载多层介质谐振器的宽带背腔缝隙天线设计

提出并设计了一种工作于X波段的新型宽带背腔缝隙天线,通过在缝隙外侧加载多层介质谐振器,有效扩展了天线带宽并显著提高了天线增益.设计的天线中心频率为10 GHz,-10 dB回波损耗带宽约为40％;带内增益5～9.5 dBi,比未加载多层介质谐振器的背腔缝隙天线提高2～3 dB.实测结果同设计结果基本吻合,有效验证了该设计的正确性.     

小型化八边形基片集成波导背腔缝隙天线

提出一款新颖的W波段八边形基片集成波导(SIW)背腔缝隙天线。相较传统的缝隙天线，具有体积小、易加工、Q值高、成本低等优点，且易于成阵。通过调节天线背腔缝隙的长度、宽度，以及SIW腔体的尺寸优化天线的辐射特性，通过电磁仿真软件HFSS对模型进行仿真优化，确定了天线的最优结构。仿真实验结果表明，所设计的天线相对带宽约4.5%，方向性优良，中心频率点谐振深度<-31 dB，天线最大增益达到5 dBi，满足设计要求，验证了设计的正确性。所设计的SIW背腔缝隙天线拓宽了数字通信的可用频谱，是一种新的尝试，可为以后的研究提供新的参考思路。     

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。     

带反射背腔的圆形缝隙天线的仿真与设计

平面宽缝天线具有全向辐射,中等增益等特点,是最具吸引力的平面宽带候选天线之一.平面宽缝天线具有不同的缝隙形状,如矩形,圆形,弧形;具有不同的馈电形状,如T形,十字形,叉状,蝴蝶结形,星形枝节,π形,双T形,圆形,矩形等.仿真和设计了一款带圆柄的微带线馈电的宽带圆形缝隙天线,并通过添加带多调谐结构的反射背腔使天线获得了良...     

W波段宽带辐射计

以被动式毫米波成像为应用背景,介绍了辐射计的工作原理,成功研制了一种带宽35 GHz集成直接检波式辐射计原理样机,以满足成像系统对辐射计的需求。信号由两级低噪声放大器进行放大,再由检波器直接检波,最后进行视频放大,以提供足够高的信号供后端进行数据采集。放大器由两级低噪声放大器组成,放大增益40 dB。单独对检波器进行设计、测试,在75~100 GHz范围内,该检波器电压灵敏度大于1 000 mV/mW,在100~110 GHz范围内,电压灵敏度大于500 mV/mW。最后集成了一个整体辐射计模块,该辐射计在35 GHz带宽内积分时间为0.6 ms,温度灵敏度为0.45 K。     

W波段宽带机调Gunn振荡器

本文介绍了一种宽带机调Gunn振荡器。该振荡器结构简单可靠,单只振荡器就几乎可覆盖整个W波段,振荡器的最大输出功率可达25mw,在所有各频率点上的电调带宽约为450MHz。     

采用新型背腔的对数周期缝隙天线

针对超宽带雷达探测系统,提出了一款具有定向辐射性能的背腔式对数周期缝隙天线.该天线由一种具有超宽带匹配特性的渐变共面波导馈电.通过在缝隙天线背面设置谐振腔,使缝隙天线具有定向的辐射方向图.根据矩形谐振腔的特点,设计了一种新型结构的谐振腔,使得天线的驻波比（Voltage Standing Wave Ratio, VSWR）小于2.5.仿真与实测结果表明：天线在整个频带(0.9~5 GHz)内具有稳定的定向辐射方向图,新型谐振腔和吸波材料的使用使天线最低工作频率可到0.9 GHz,可使天线在整个频带内得到较高的天线增益.设计的天线适于应用在导航、探测以及超宽带(Ultra-wide Band,UWB)雷达等领域.     

X波段二维宽带宽扫背腔微带天线

设计了一种X波段背腔微带天线,采用探针和口径耦合相结合的馈电方式实现了小单元间距下单层微带贴片的宽带工作,并弱化了馈线寄生辐射对方向图的扰动。设计加工了8×8单元的天线小阵。实测结果表明,该天线在设计要求的2GHz带宽内驻波小于1.5,驻波小于2的相对带宽25%;方向图测试结果表明实现了方位向45°、俯仰向30°的扫描,增益22.8dB,天线效率大于80%,可满足二维宽带宽扫瓦片天线的实际应用需求。     

W-band substrate integrated waveguide slot antenna

A W-band substrate integrated waveguide slot antenna has been designed and tested. The antenna has been realised using a reduced height waveguide in photoimageable thick film technology. Experimental and simulated return loss and radiation pattern measurements are presented.     

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。     

基片集成波导双极化环形缝隙天线研究

基于基片集成波导(SIW)结构,提出了一种具有高端口隔离度的双极化缝隙天线。天线正面蚀刻一个直径约为λ0/2的环型缝隙作为辐射源,工作于圆形SIW谐振腔的主模TM11;背面中心位置蚀刻微带交指电容,使SIW腔体电尺寸减小了约7%;采用一对正交微带线分别由两个端口为天线馈电。所设计的天线谐振在5.8 GHz频段,–10 d B阻抗带宽为1.7%,最大增益为8.5 d Bi,端口隔离度高于35 d B。测试结果表明,该双极化天线具有高隔离度、高增益的特点,可用于MIMO等无线通信系统中。     

SIW四极化“目”字形漏波天线

为克服传统漏波天线存在的开阻带缺点,提出了斜45°“目”字形缝隙结构,分析了该结构的色散特性和辐射特性,进而设计了具有波束从后向到前向连续扫描功能的漏波天线。同时,提出了四极化形成方案,利用 3 dB 耦合器作为圆极化馈电网络,再引入90°移相器后形成线极化馈电网络。将两条“目”字形缝隙线阵与馈电网络相结合来实现四极化漏波天线。测试结果表明,该四极化天线具有较好的端口隔离度,线极化的波束扫描范围是-25°~21°,圆极化的波束扫描范围是-21°~31°。     

Analysis of hemispherical cavity-backed slot antenna

The input impedance of the hemispherical cavity-backed slot antenna is investigated theoretically and experimentally. The mode-matching method and moment method are used to find the Green's function of the cavity and the equivalent magnetic current of the slot, respectively. The effects of slot length and cavity radius on the input impedance are studied     

Network model for strip-fed cavity-backed printed slot antenna

An equivalent network for the strip-fed cavity-backed slot antenna is derived. The model is based on some physical insight into the problem. The various parameters of the network are derived from the experimental data on the input reflection parameter of the antenna. This model gives an insight into the strip-slot-cavity coupling and hence the working of the structure. It is also useful for predicting the performance of such practical antennas.     

Wideband double-element ring slot antenna

A new technique for bandwidth enhancement of microstrip-fed annular ring slot antennas is presented. Using this technique, a wideband antenna is designed that has consistent radiation parameters across the entire band and has a bandwidth that is six times larger than that of an ordinary ring antenna.     

基于基片集成波导技术的超宽带八木天线

为便于系统集成和简化馈电电路,利用基片集成波导技术设计新型八木天线.通过引向器异面分置来提高增益,提出了X波段基片集成波导八木天线,并分析了引向器个数对天线增益和工作带宽的影响.利用增加激励器个数和改变馈电结构来扩展带宽,设计了单模和半模基片集成波导双激励超宽带八木天线,仿真和测试结果表明,基片集成波导双激励八木天线的工作带宽超过40％,带内增益均高于7.0 dBi,中心频率处为9.0dBi,可以广泛应用于雷达和通信系统中.     

Millimeter wave dielectric loaded exponentially tapered slot antenna array using substrate integrated waveguide for gigabit wireless communications

A new and upcoming application is the use of 60 GHz antennas for high date rate point-to-point connections to serve Gigabit(Gi-Fi)w ireless communications.The design of M illimeter w ave(M m W)antennas has to cope w ith the unadorned influences of manufacturing tolerances and losses at 60 GHz.In this paper,the concept of Substrate Integrated Waveguide(SIW)and Exponentially Tapered Slot(ETS)antenna w ere used together to design a high gain,efficient planar dielectric loaded antenna for M m W Gi-Fi w ireless communications at 60 GHz.The SIW is used to feed the antenna and a dielectric is utilized in front of the antenna to increase the gain.The dielectric loaded ETS antenna and compact SIW feed w ere fabricated on a single substrate,resulting in low cost and easy fabrication.The antenna w ith elliptical shaped dielectric loaded w as fabricated using printed circuit board process.The measured gain of the single element antenna is 10.2 dB,w hile the radiation efficiency of 96.84%is obtained at 60 GHz.The Y-junction SIW pow er divider is used to form a 1×4 array structure.M easured gain of the 1×4 array antenna is 13.3 dB,w hile the measured radiation pattern and gain are almost constant w ithin the w ide bandw idth of the antenna.     

The input admittance of the rectangular cavity-backed slot antenna

The input admittance of the rectangular cavity-backed slot antenna is investigated. The slot is assumed narrow so that the voltage distribution in its aperture is sinusoidal. Equations which represent the input admittance of this slot, backed by a rectangular cavity in which a single propagating wave is assumed to exist, are given. Calculations based on these representations are compared to available measured data. As the depth of the cavity increased the resonant frequency decreased and the bandwidth became narrower. Input admittance curves as a function of electrical slot length are also presented for several size cavities.