一种宽带水平全向平面天线设计

为提高水平全向天线的带宽,设计了一种宽带水平全向平面天线.该天线由4只弧形偶极子天线组阵构成一个圆环,每只偶极子天线振子交错印刷在印制板的上下表面.将4只弧形偶极子远场方向图叠加组合为水平全向辐射方向图;在每只偶极子振子上开缝并在印制板边缘加载寄生贴片,增加天线的带宽.设计和加工制作一只天线样品,测试结果表明,该天线能...     

Radiation Characteristics and Mutual Coupling of a Dual: Band Antenna Array Structure

In this paper, an antenna array structure consisting of a reflector plate and a number of printed dipole radiation elements is investigated. This antenna array implementation is suitable for the globally available 2.4 and 5?GHz ISM frequency band facilitating a variety of wireless applications. S-parameters and radiation characteristics are simulated and measured in details. The impact of the plane reflector on radiation patterns and the reflection coefficient are also investigated. Furthermore, mutual coupling effects between adjacent elements and the corresponding radiation patterns are studied for different antenna array configurations. Both simulated and measurement results are useful in antenna array design and antenna applications in wireless communications.     

新型圆环嵌套多频印刷天线

提出了一种具有多频特点的新型圆环嵌套印刷天线,该天线由不同直径的圆环嵌套得到。通过电磁仿真软件CST Microwave Studip进行仿真研究,结果表明嵌套圆环的外径、宽度和嵌套数目可以对其通频带中心频率、频带宽度和通频带数目进行控制。设计出了具有2．4GHz,3．5GHz,5．2GHz,5．8GHz四个通频带的共面波导馈电的单极印刷天线和以平衡微带线馈电的对称振子天线。制作了天线实物并在微波暗室中进行测试,测试结果与仿真吻合较好,该天线具有近似独立的频率可控性和较小的尺寸,可用于WLAN和WiMAX等领域。     

FD-TD法用于环形相控振子天线阵列的数字模拟

本文论述了FD-TD法用于电磁辐射系统的近场计算问题,用该方法实现了对环形相控振子天线阵列的数字模拟。作为对方法的检验首先计算了单个振子天线上的电流分布,还计算了环中充满去离子水时阵列的近区场及其与人体躯干块状模型的相互作用。     

WLAN双频印刷天线的设计

设计了一种应用于2.4GHz和5.8GHz无线局域网的双频天线。天线由4个印刷偶极子分别组成两对阵列而成,每一对阵列分别工作在各自的谐振频率上,从而实现双频。介质板背面印刷有巴伦进行耦合馈电。该天线具有结构简单、体积小、重量轻,成本低、易于集成等优点,适用于无线局域网系统。     

一种32元宽频带印刷偶极子天线阵列

基于椭圆形印刷偶极子设计了一种宽频带天线阵列,阵列单元与馈电网络均印制在同一介质基板上,易于加工和集成.对影响天线性能的阵列结构参数进行了分析,得到了能够获得较佳电性能的结构参数.对天线进行了仿真分析与实际测试,仿真与测试结果一致性较好.测试结果表明,该阵列在2.32～5.48GHz频率范围内电压驻波比小于2.0,且在该频率范围内具有定向辐射特性,最低增益为17.7dB,最高增益为22dB,相对带宽达到81％.     

Dual-band printed dipole antenna with parasitic element for WiMAX applications

Recently, wireless communication has grown exponentially worldwide. The wireless system that is currently popular is the Worldwide Interoperability for Microwave Access (WiMAX) system, which operates in the 2.5?2.7, 3.3?3.8 and 5.2?5.8 GHz frequency bands; the standard that defines interoperability across these bands is IEEE 802.16a/d/e/2004 [1]. Because of this, broadband and multiband antenna designs have become important in wireless applications. Recently, various antenna designs such as those of microstrip line, coplanar waveguide, and PIFA dipole antennas have been presented in the literature. In [2], a novel miniature end-loaded planar open-sleeve dipole (ELPOSD) antenna was presented; it was demonstrated to have a large bandwidth and a short length. A printed dipole antenna with U-slotted arms was proposed in [3]. With the aid of an embedded U-shaped slot, it can generate a new resonant mode at 5.2 GHz. In [4, 5], printed dipole and monopole antennas with parasitic elements were presented. The experimental results show that parasitic strips can be coupled with dipole antennas in order to give rise to additional resonance modes. A broadband printed dipole antenna with a stepshaped feed gap was proposed in [6]. The wide operating band is controlled by the different lengths of the radiation arms. Thus, it was demonstrated that a dipole antenna with parasitic elements has the ability to realise multiband or broadband operation.     

双对数周期偶极天线扇形阵的研究

论述了双对数周期偶极天线扇形阵的设计方法,利用IE3D软件对单个对数周期偶极天线(LPDA)和双对数周期偶极天线扇形阵进行了优化仿真分析,并研制了天线实物样机,同时对该天线的电性能进行了测量.测量结果表明,该双对数周期偶极天线扇形阵具有宽带、高增益、小型化等特点,进而说明该设计方法是行之有效的.     

Infinite array of printed dipoles integrated with a printed stripgrating for suppression of cross-polar radiation. I. Rigorous analysis

A rigorous analysis of an infinite array of printed dipoles integrated with a covering layer of printed strip grating is presented. Such designs can be useful to achieve low to ultra-low levels of cross-polar radiation from printed antennas, which is otherwise difficult to obtain from standard printed antenna designs. The analysis rigorously accounts for coupling between the grating strips and the dipole array in a general multilayered environment. Various demonstrative and design results showing loading effects of the grating on scan and impedance characteristics of the array are presented. Some interesting fundamental effects of the grating on the cross-polarization level and scan-blindness behavior are discussed     

一种新型宽带印制天线

本文给出了一种新型双偶极子型宽带印制天线,并设计出相应的类平行宽边耦合双线双面馈电结构。采用矩量法求解积分方程进行理论分析,由此设计出一种新型宽带印制天线,并进行实验测试。理论分析表明：在相同的基片上,双偶极子型印制天线比普通微带振子天线的带宽宽得多;同时实测结果表明：在0.8mm的介质基片上,工作于中心频率2GHz的该新型天线带宽可达23％（VSWR＜2.0）,增益达4.3dBi。该宽带天线为平面印制结构,易于与电路集成,亦可做为天线阵元,成本低,性能好。     

NUMERICAL SIMULATION OF ANNULAR PHASED ARRAY OF DIPOLE ANTENNAS USING THE FD-TD METHOD

The problem for calculating near fields of EM radiation systems by using the finitedifference time domain(FD-TD)method are discussed and the annular phased array of dipoleantennas has been simulated numerically by use of the FD-TD method.For a test run thenear field and current distribution of the single dipole antenna are calculated.The near fieldsof the annular phased array of dipole antennas in central region filled with deionized water arecomputed and the interaction of near fields with an anatomically-based inhomogeneous model ofhuman torso is considered as well.     

Efficient detection in uniform linear and planar arrays MIMO systems under spatial correlated channels

In this paper, the efficiency of various multiple‐input multiple‐output (MIMO) detectors was analyzed from the perspective of highly correlated channels, where MIMO systems have a lack of performance, besides in some cases, an increasing complexity. Considering this hard but a useful scenario, various MIMO detection schemes were accurately evaluated concerning complexity and bit error rate performance. Specifically, successive interference cancellation, lattice reduction, and the combination of them were associated with conventional linear MIMO detection techniques. To demonstrate effectiveness, a wide range of the number of antennas and modulation formats have been considered aiming to verify the potential of such MIMO detection techniques according to their performance‐complexity trade‐off. We have also studied the correlation effect when both transmit and receiver sides are equipped with uniform linear array and uniform planar array antenna configurations. The performance of different detectors is carefully compared when both antenna array configurations are deployed considering a different number of antennas and modulation order, especially under near‐massive MIMO condition. We have also discussed the relationship between the array factor and the bit error rate performance of both antenna array structures.     

耦合激励系数及对称振子阵列天线的有源方向图研究

为了深入探讨相控阵天线单元间的耦合对阵中单元方向图的影响,以阵列天线单元S参数为基础,给出了阵列天线单元的耦合激励系数计算公式,利用阵列天线单元间的耦合激励系数分析计算阵中单元的有源辐射方向图.同时利用矩量法分析由偶极子单元组成的阵列,并把阵列中每个单元的感应电流幅度和相位与耦合激励系数的幅度和相位进行比较,二者数据基本一致.矩量法计算的单元有源方向图与本文提出方法的计算结果吻合良好,验证了本文给出的阵列耦合激励系数及阵列天线阵中单元有源方向图计算方法的可靠性.     

Analysis and size reduction of various printed monopoles withdifferent shapes

A simple analysis based on the transmission line model applied to printed dipole antennas, and the Babinet principle allows different shapes of printed monopole antennas to be easily optimised. A shortening ratio (ρ) of 48% (respectively 30%, 40%) is achieved for the monopole antenna by using a step change in line width (respectively a triangular monopole, and a line with a triangular cap). Theoretical input impedance of these various monopoles compare closely with experimental results     

新型可重构临近耦合偶极子天线阵

提出了一种可重构的临近耦合印刷偶极子天线阵。其通过控制每个振子的间距和振子偏移中心馈线的距离实现方向图的改变,提出的可重构天线阵,将形成不同方向图的偶极子天线阵嵌套排布,并通过pin管开关切换不同的偶极子辐射单元组,从而实现天线方向图的重构,改变天线的最大辐射方向。仿真结果表明在9.8 GHz的中心频点上,该天线可实现最大辐射方向在0°和40°上切换:波束指向为0°方向时,最大增益为12 dBi;为40°时,最大增益为8.7 dBi,两种工作状态下天线输入端s11均优于-30 dB,匹配良好。     

岸基远程高频表面波雷达小型宽带天线系统的设计

从高频表面波雷达天线工程的角度出发,基于对数周期天线的设计理论,优化设计了一副小型 宽带发射天线;基于端射阵理论,优化设计了一副小型宽带、具有大前后比的双鞭天线,并以此作为阵列天线的基本单元组成六元均匀线阵。文中分析了收发天线的工作原理,并给出了计算机模拟结果。     

微带磁流振子天线综述

文章综述了微带磁流振子天线的最新发展情况,从理论上对比了微带磁流振子天线和电流振子天线的辐射机理,阐述了微带磁流振子具有水平极化和高增益的新颖性,最后介绍了微带磁流振子在新型天线阵列、圆极化天线、高增益天线的应用。     

一种新型分形印刷折合振子的设计

首先采用递归法构造了一种新型的分形结构,并利用其设计了分形印刷折合振子,然后对传统印刷巴伦进行了结构调整,有效地缩减了馈电电路的物理尺寸.使用Ansoft HFSS和Serenade软件对天线进行仿真优化,制作了实物并完成实验测量.仿真结果和测量数据表明:该新型分形印刷折合振子的横向尺寸较传统的半波印刷振子能够缩减68%,这与Hilbert分形印刷折合振子比较,具有良好的尺寸缩减性.     

一种新型宽带双极化低剖面复合式阵列天线

提出了一种利用多种形式的辐射贴片阵元组成的复合式阵列天线。阵元采用了多种形式的馈电方法。部分阵元和馈电微带线直接连接馈电,其他阵元和馈电微带线采用电磁耦合进行馈电。通过优化辐射贴片的形状、对应的馈电方法、辐射贴片连接端的阻抗调节块、阵列单元之间的阻抗调节段,在宽频带内不但获得了良好的阻抗特性,也实现了期望的赋形辐射方向图。测试结果表明,该阵列天线高度小于中心频率的0.06个波长,相对阻抗带宽(驻波比小于1.45)和辐射带宽分别超过23%和17%。     

Multiport scattering analysis of general multilayered printedantennas fed by multiple feed ports. II. Applications

For Part I, see ibid., vol.40, no.5, p.469-481 (1992). The general analysis of part I is applied to several practical geometries of multilayer/multifeed printed antennas. These examples include a dual-feed circularly polarized geometry; a stacked patch geometry; a stripline-aperture coupled geometry with a radome; an open-end proximity-coupled patch; and dipole and slot geometries inclined or perpendicularly coupled to different feedlines. Features of the selected geometries cover many practical aspects of multilayer integrated phased arrays. Experimental results for several geometries are compared with the analytical results to demonstrate the accuracy and versatility of the analysis used. Various design considerations for the use of these multilayered printed antenna geometries in integrated phase array applications are discussed