一种倒F振子在共形阵列天线中的应用

提出一种新型的倒F振子天线结构。通过使用圆形金属片电容加载以及短路钉的电感加载,得到宽带小型化天线单元。采用广义传输线理论（GTLM）分析了天线的结构双式,给出设计实例,并介绍了该天线单元在飞行载体上柱面共形阵列天线中的应用。在以往柱面共形阵列天线的研究中,阵列波束大部分为垂直于共形面方向的能量辐射,而这里提出的柱面共形阵列天线设计方案着重于可产生平行于共形面的能量辐射。     

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...     

宽频带全向机载雷达天线的仿真设计

本文设计仿真了一种具有宽带特性的机载雷达天线,利用HFSS对平面天线和共形天线进行了仿真,对比了平面天线与共形天线的阻抗特性和辐射特性,仿真结果表明共形后的天线带宽变大,增益提高,波束宽度展宽,在宽频带内实现了低仰角扫描和方位面的全向扫描,辐射特性稳定,满足机载天线的性能指标,适合用作机载天线的共形单元。     

锥体共形相控阵天线的特性分析

基于电磁场理论推导了锥体共形相控阵天线的阵因子。与平面相控阵天线相比,锥体共形相控阵天线单元间的空 间相位差既与阵元的轴向位置有关,又与阵元的周向位置有关。因此,在进行锥体共形相控阵天线设计时,除采用二维相 控阵形式外,尽量避免采用一维相扫锥体共形相控阵天线。     

共面耦合馈电小型化E-E形及半E-E形宽带微带天线

提出并设计了一种可应用于多频段无线通信的小型化宽带微带贴片天线.天线采用共面容性耦合的馈电方式补偿探针的分布电感,应用FR4高频介质板与空气层组成的层叠介质、E-E形和半E-E形辐射贴片缩减天线的尺寸.结果表明,E-E形微带天线和半E-E形微带天线的阻抗带宽分别为1.85～2.57 GHz(相对带宽32.6％)和1.85～2.50 GHz(相对带宽29.9％).和普通E形微带天线相比,E-E形和半E-E形微带天线的贴片面积缩小了47％和61％.     

基于共形稀疏阵列的艇载外辐射源雷达性能分析

该文研究了共形稀疏阵列在艇载外辐射源雷达中的应用问题,并分析了艇载外辐射源雷达目标探测性能。鉴于天线在雷达系统中的重要地位,重点分析了稀疏阵列数字波束形成(DBF)天线的布阵方式及天线方向图指标。基于组合巴克码实现艇身稀疏阵列共形布设,提出一种曲线阵列到直线阵列的补偿方法,以获得理想的DBF天线方向图。针对曲线阵列可能存在的形变问题,采用分布式位置和姿态测量系统(POS)进行形变误差测量,经曲线拟合后实施精确补偿。仿真结果表明所提方法的有效性。     

水平全向共形微带天线的设计

设计了两种水平全向共形微带天线,采用电磁仿真软件CST MWS（CST MICROWAVE STUDIO）进行仿真,给出了天线的回波损耗和水平面方向图。天线采用了结构上对称的形式,利用微带贴片天线单向辐射的机理,实现了水平方向全向辐射。分析了天线的结构及仿真图,研究了阵列天线参数对全向性不圆度指标的影响,对于设计水平全向共形微 带天线有重要的价值。     

共形微带天线相控阵阵列的仿真优化设计

针对平面阵列天线的诸多缺点,设计了适用于工作频段34～36GHz的共形相控阵天线。依据共形微带天线阵列的设计思想及方法,选取了柱面微带贴片天线做阵列辐射单元,通过CST软件对天线的几何尺寸进行仿真和优化设计,得出了共形天线阵的各种性能指标。仿真结果表明：在该毫米波波段下设计的共形相控天线具有优良的性能,为今后设计出最优的天线阵提供了依据。     

应用于反辐射导弹的共形天线

论述了反辐射导弹的发展趋势和需求,根据飞行器天线的共性和反辐射导弹天线的特性,列举了反辐射导弹一般可选用的天线,并研制了两种便于共形的天线,通过实验证明这两种天线达到了预期效果,为共形天线的进一步仿真研究、工程实现奠定了一定的基础。     

PBG结构特性的研究及其在天线中的应用

本文比较了PBG(photonic band-gap)结构的三种测量方法,包括共面微带线法,振子法和悬置微带线法.然后以PVPBG(patch and via PBG)结构为例研究了PBG结构在振子天线、微带天线和E形天线中的应用.仿真和实验结果表明PBG结构可以起到改善天线输入阻抗,增强前向辐射,抑制后向辐射,提高天线前向增益的作用.在缝耦合PVPBG结构的基础上,提出了一种新的交指PVPBG结构,其尺寸为具有相同带隙频率的缝耦合PVPBG结构的3/4.     

圆柱共形缝隙阵

给出用圆弧弯波导耦合馈电的圆柱共形阵设计原理，重点是弯波导与扇面形直波导列之间的耦合孔列计算。耦合孔列同时控制辐波导的激励强度和补偿由于柱面缝隙射线程长度不等所引的相位差。     

FGS视频流无线时隙传输的能量有效性

提出了一种精细粒度可分级编码（FGS）视频流的基于无线信道时隙调整的能量有效传输方法,在满足失真与延迟的约束条件下,通过调整FGS层数、基层延迟以及数据传输的时隙位置使FGS的传输能量达到最小。实验结果证实了该方案的有效性。     

一种微带缝隙阵列询问天线

介绍了一种单脉冲工作体制的微带缝隙阵列询问天线。设计了一副6 单元的微带缝隙阵列天线,通过选择合适的天线单元、调整馈电网络的幅相特性,使得天线阵列在13%的工作带宽内驻波小于1.6,差方向图获得良好的对称性,差波束零深低于-30dB,且和差波束不存在穿刺现象。显示了其良好的工程应用价值。     

A beam steering antenna for X-band high power applications

There is a considerable interest in the antennas which have high power handling capacity with beam steering functionality. The design of narrow side waveguide slot-array antenna for high power applications is introduced in this paper. An approach to achieve a uniform radiation slot waveguide antenna is presented. The large scale array antenna can be composed of such antenna cells. Moreover, it is possible to realize beam steering in the azimuth direction by adjusting the broad wall dimension of the waveguide. Besides, this slot waveguide antenna is expected to have high power handling capacity in vacuum environment, because there is no dielectric or electric field enhancement inside the antenna.     

Electric field penetration and perturbation problems of anonuniform cylindrical cavity with a slot

In bipolar coordinates, a nonuniform conducting cylindrical cavity with a slot in a uniform electric field E₀ is analyzed. The authors investigate the electric field penetration of a slotted cylindrical cavity through the slot and the electric field perturbation of an incomplete conducting cylinder. A family of objects are included by changing the structural parameters of the nonuniform cylindrical cavity with a slot. Both analytical expressions and numerical results of some special structures are given     

Coplanar waveguide-fed slot antennas on cylindrical substrates

This paper describes cylindrical coplanar waveguide (CCPW)-fed slot and folded slot antennas encompassing cylindrical substrates. Using a 1.27 cm diameter Teflon substrate, antennas that operate around 7 GHz have been realized with gains of 1.5 dB (slot) and 2.8 dB (folded slot). The antennas have a well-defined pattern null of 8 dB along the side of the CCPW feedline. A 1.6 GHz slot antenna on a 1.27 cm diameter alumina substrate was also fabricated using a novel direct-write technique, and shown to have comparable performance characteristics.The results include measured data and simulated data using a 3D cylindrical finite difference time domain (FDTD) code.     

Theory and Experiment of an Aperture-Coupled Hemispherical Dielectric Resonator Antenna

A hemispherical dielectric resonator (DR) antenna using aperture coupling for excitation is studied both theoretically and experimentally. The reciprocity method is used to formulate the problem. The exact magnetic field Green's function due to the equivalent magnetic current in the slot is derived rigorously, and it is presented in a form which can be evaluated very efficiently. Moment method is used to solve the magnetic current from which the input impedance of the antenna configuration is obtained. The equivalent radius of the slot is used so that simple formulae developed for the cylindrical dipole can be applied directly. The effects of the slot's length, the slot's position, and the slot's width on the broadside TE₁₁₁ mode input impedance are studied, and reasonable agreement between theory and experiment is obtained     

相频扫描阵列通道幅相测试方法研究北大核心CSCD

相频扫描阵列具有频扫低成本和相扫控制灵活等优点,被广泛用于军事和民事。该类阵列的增益、相位扫描面波束副瓣等受通道的幅度相位一致性影响较大,需要经过校准补偿以获得高性能波束。准确高效的通道幅相测试方法是进行校准的前提和基础。文中首先分析了组成相频扫描阵列的波导缝隙天线近场区域的辐射特性,得出在柱面波区域进行取样的可行性。在此基础上提出了扫描架逐行移动取样以及中场取样两类共五种测试方法,并给出了程差的幅相补偿方法。计算了各测试方法所引入的系统误差,分析了它们各自的适用场合。最后对比其中两种测试方法在某相频扫描阵列样机中的幅相测试结果,并给出了补偿校准后的波束测试结果,验证了文中所提出测试方法的准确性和有效性。     

Printed cylindrical slot antenna for GPS commercial applications

The authors present a new printed cylindrical slot antenna for GPS commercial applications. This antenna displays compact size, low cost, ease of mass production, near-hemispherical radiation coverage and circular polarisation properties. Experimental results show that the printed cylindrical slot antenna has a 3 dB beamwidth of 120° and a front-back ratio >15 dB     

一种展宽波导缝隙阵列天线驻波带宽的新方法

辐射缝隙导纳和耦合缝隙阻抗的频率特性,是影响缝隙阵列天线驻波带宽的主要因素。以改善整个缝隙阵阻抗匹配频率特性为出发点,提出了一种展宽波导缝隙阵列天线驻波带宽的新方法,即选择合适的辐射缝隙的总导纳常数。仿真分析表明,改变后的缝隙阵列天线的驻波带宽有了较大改善,其与理论分析的结果是一致的。