Hybrid Planar Inverted‐F Antenna with a T‐Shaped Slot on the Ground Plane

In this letter, a novel hybrid planar inverted‐F antenna (PIFA) with a T‐shaped slot on the ground plane is proposed. The loop structure formed by the feed line and shorting pin can be operated as a series and shunt inductance for the PIFA and the T‐shaped slot antenna, respectively. The PIFA operates at a frequency of 1.75 GHz, while the T‐shaped slot on the ground plane operates at 2.4 GHz by the same voltage feeding source. The height of the PIFA is 6.5 mm, and the size of an upper patch is designed to be 30 mm…16 mm. The measured relative impedance bandwidth of the PIFA and the T‐shaped slot are about 12% and 21%, respectively. In addition, good antenna performance was achieved.     

Enhanced‐Gain Planar Substrate‐Integrated Waveguide Cavity‐Backed Slot Antenna with Rectangular Slot Window on Superstrate

A novel substrate‐integrated waveguide (SIW) cavity‐backed slot antenna is proposed in this study to achieve enhanced‐gain performance. The peak gain is remarkably improved with the use of an SIW cavity and metallic superstrate. The superstrate comprises a single rectangular slot window and two half‐wavelength patches. The gain can be enhanced by combining the in‐phase radiating fields. Further, the 10 dB bandwidth of the proposed antenna ranges from 2.32 GHz to 2.49 GHz, which covers the wireless local area network band. The measured peak gain is 9.44 dBi at 2.42 GHz.     

一种H形槽耦合的Ku波段宽频带微带天线

提出了一种Ku波段的新型宽频带微带天线,改进了H形槽耦合微带天线的结构,在辐射贴片和反射板上均开H形槽以展宽工作频带.用商业应用软件IE3D对天线电特性进行仿真计算,并制作了实验模型.实验测量结果与理论仿真结果吻合良好,其电压驻波比（VSWR）小于2的阻抗带宽达到了27.4%,交叉极化电平小于-20 dB.     

微带线馈电的宽带单层贴片天线

微带贴片天线已广泛应用于雷达系统,文中介绍了一种新型背腔式单层微带贴片天线,辐射贴片采用微带线馈电,为增加工作带宽,提供了两种不同的贴片形状,第一种是E形贴片,仿真及测试结果表明,此种单元在驻波比优于2的条件下可实现45%的阻抗带宽,但该单元的波瓣带宽较窄。为抑制交叉极化,通过在E形贴片上开四个槽,得到了第二种改进的E形贴片。该单元可实现14%的频带内驻波比优于1.5,同时交叉极化优于-15dB。对C波段8×16单元实验小阵的测试结果表明,该天线在17.9%的频段内具有良好的交叉极化性能及较高的工作效率。     

新型集成超宽带开槽天线的研制及其应用

研制出一种用于超宽带短脉宽射和接收的新型集成超宽带槽天线，该天线采用共面波导到槽线的宽带过渡方式馈电，实验结果显示了其高保真的宽带特性及高增益高效益特性。利用所研制的ＵＷＢ天线建立起超宽超带雷达实验系统，测量几种简单目标特性及涂层目标特性，证明了该种天线可用作实际的ＵＷＢＲ天线。     

非辐射边馈电的宽带双层微带贴片天线

介绍了一种非辐射边馈电的宽带双层微带贴片天线单元,并对其参数特性进行了仿真研究,结果表明,通过在寄生贴片上开3～5个与极化方向相平行的缝,可有效抑制天线的交叉极化,同时改善天线的阻抗带宽。相比传统双层微带贴片,该天线单元的阻抗带宽可提高3%以上,而交叉极化指标相当。当该单元应用于阵列天线设计时,可简化馈电网络,便于实现宽带、高效、大扫描角的微带共面馈电天线阵。对X波段8×8单元实验小阵的测试结果表明,该天线在17.6%的频段内具有良好的交叉极化性能及较高的工作效率。     

一种新型的超宽频天线的设计

提出了一种微带馈电的新型超宽频的天线,该天线印刷在覆铜介质基板上,介质基板尺寸为30.0 mm×35.0 mm×1.6 mm,材料是介电常数为4.4的FR4介质,利用仿真软件HFSS对天线参数进行仿真和优化.通过在微带面上开缝,可实现天线频带宽度(回波损耗S11＜-10 dB)2.6～11.5 GHz,相对带宽达126％.结果表明,该设计天线不仅满足超宽带要求,且结构简单,体积小,适合在超宽带天线(UWB)通信中应用.     

一种采用电磁带隙结构地板的微带八木天线

提出了一种采用二维电磁带隙结构地板为反射器的微带八木天线.对所构造电磁带隙结构的电磁传输特性进行了研究,通过HFSS仿真和优化,使所设计天线的谐振频率落在电磁带隙地板阻带范围之内,有效地提高了天线的增益和阻抗带宽.实测结果表明,在2.3～2.75 Ghz频率范围,所设计天线的回波损耗S11≤-10dB,其阻抗相对带宽为...     

一种十字形缝隙耦合的Ku波段宽频带双极化微带天线

采用十字缝隙耦合,层叠贴片和微带线馈电的结构形式,设计了一种适用于Ku波段的宽频带双极化微带天线。利用电磁仿真软件CST 5.0微波工作室对天线的电特性进行仿真优化,并制作了实物模型,实测结果和仿真结果吻合良好。两馈电端口回波损耗小于-10 dB的阻抗带宽分别达到34.2%和28.7%,端口隔离度高于21.4 dB。     

宽带双向微带天线设计

针对室内走廊或狭长街道小功率基站应用要求,采用微带结构设计了一款具有双向辐射特性的宽带线极化低剖面天线.天线辐射元为平行四边形结构,馈电点在其几何中心,通过在靠近馈点两侧开两个反对称L形槽,实现了宽带双向辐射特性.低剖面原型天线的相对带宽为5.8％,两端射方向增益约为4.3dBi,在工作频带内天线辐射场为有一定倾角的线极化.该天线结构可置于小功率基站内部,有助于减少系统体积.     

Non‐resonant Element in Slotted Ground Plane for Multiband Antenna Operation

New ways of achieving small, multiband, multifunctional, and standard solutions for mobile handset antennas are demanded in the current wireless market. A non‐resonant element of , a matching network, and a slotted ground plane are proposed to satisfy mobile market demands that require multiband operation and small antenna solutions. The main advantage of the proposed design is that with only one non‐resonant element of considerably small size (0.015λ, 900 MHz), the handset is capable of providing operation at mobile bands.     

Circularly Polarized Square Ring Slot Antenna with Arrow‐Shaped Structure

A novel design of a compact square‐ring slot microstrip antenna for achieving circular polarization (CP) operation is proposed and experimentally studied. By using an arrow‐shaped slot structure as a radiating element, the resonant frequency of the proposed antenna is significantly lowered, which can lead to a large size reduction for fixed frequency operation. The CP radiation characteristics are achieved by loading with proper asymmetry, which can be placed diagonally. A prototype of the proposed design is implemented and its performance is measured. Measured results show that radiation patterns with good CP characteristics are obtained at the resonant frequency.     

工作于2.4GHz/5.2GHz双频段微带缝隙天线的设计

设计了一款可应用于WLAN无线通信设备上的新型结构缝隙天线,该天线采用在贴片上开槽加载和微带线馈电等方法使其可工作在WLAN的2.4GHz/5.2GHz双频段上。通过高频仿真软件HFSS对天线进行的仿真结果比较理想,实测结果表明该天线覆盖了WLAN所需要的频率带宽为2.4000～2.4836GHz和5.15～5.35GHz。     

宽频带圆极化缝隙螺旋天线的设计

研究了一种宽阻抗带宽和宽圆极化轴比带宽的缝隙螺旋天线。天线印制在由FR4介质基板构建的方形柱状结构的内外表面,两组长短不同的缝隙螺旋臂印制在介质基板外表面并延伸至天线顶部;一条弯折的微带线作为馈电网络印制在介质基板内表面,通过对各缝隙耦合馈电,实现天线宽阻抗带宽和轴比带宽。实测结果表明:天线尺寸为0.111λ₀×0.111λ₀×0.221λ₀(λ₀为北斗B2中心频率1.207 GHz对应的自由空间波长),S₁₁≤-10 dB的阻抗带宽为1.158~1.778 GHz,轴比≤3 dB的圆极化带宽为1.133~1.918 GHz。该天线采用缝隙螺旋结构,通过简易的馈电网络实现天线小型化和宽频带特性,在卫星导航系统中具有较好的应用前景。     

一种探地雷达用的渐变槽线加载天线

提出了一种可用于探地雷达系统的电阻加载渐变槽线天线。在分析影响渐变槽线天线加载效果凼素的基础上，提出了一种改进的槽线金属面形状，提高了电阻加载的效果。实际测试结果显示，电阻加载渐变槽线天线拖尾脉冲的幅度非常低。     

LTCC宽频圆极化环形微带贴片天线研究

设计了一种低温共烧陶瓷( LTCC)宽频带圆极化环形微带贴片天线.该天线采用环形辐射贴片结构,在环形内部利用L型匹配支节连接以拓展带宽.通过使用威尔金森功分器加移相器对辐射贴片馈电,使耦合馈电端口的正交电场相位差90.来实现微带天线的圆极化.该天线设计剖面厚度仅2.4 mm.仿真结果显示该天线工作于1.268 GHz时,实现阻抗带宽超过80 MHz,天线的轴比小于1.5 dB且增益达到4.9 dB.实测结果与仿真结果相近.     

共面波导馈电蝶形开口振子缝隙天线

讨论了共面波导(CPW)馈电蝶形开口振子缝隙天线。在缝隙振子天线两端加入蝶形开口结构,形成振子蝶形组合结构天线。使用有限元仿真软件(Ansoft HFSS)分析了设计的天线,结果表明组合结构天线具有振子天线与蝶形天线的优点:蝶形天线的宽带特性与振子天线的高增益特性,整个天线的性能得到提高。使用了两种馈电方式:感性耦合和容性耦合,感性耦合时组合天线的带宽特性较好,从振子天线5.9%提高到10.32%;容性耦合时增益特性较好,从振子天线的3.19dB提高至6.27dB。分析了衬底厚度对天线的影响,衬底厚度的增加使谐振频率降低,但对天线带宽的影响不大。     

Ku波段宽频带高隔离双极化微带天线阵的设计

设计了适用于Ku波段的宽频带高隔离度双线极化4元微带贴片天线阵.用商业应用软件IE3D对天线电特性进行仿真计算,并制作了实验模型.测量结果与仿真结果吻合良好,两馈电端口驻波小于2的阻抗带宽分别为21.56%与22.58%,隔离度高于32dB,实测增益12.8 dBi.     

基于超表面的宽带低剖面圆极化天线设计

设计并制备了一种基于超表面的宽带低剖面圆极化天线。该天线由上下两层构成,下层是传统的线极化缝隙微带天线,上层是由方形切角单元构成的超表面。分析了超表面将线极化波转换成圆极化波的工作原理,并对影响天线圆极化带宽的参数进行了优化。仿真结果表明:加载超表面后,不仅使天线辐射圆极化波,还扩展了天线的阻抗带宽,天线相对阻抗带宽达到17%,3 dB轴比带宽达到7.2%。为了验证设计的有效性,加工、测试了天线实物样品,并与仿真结果进行了对比。实测结果与仿真结果吻合较好,说明该天线具备宽带圆极化特性。最终天线整体尺寸仅为0.4λ×0.4λ×0.03λ,天线的剖面较低,非常有利于与载体共形的应用。     

Miniaturization of an Ultra‐Wideband Antenna with Two Spiral Elements

In this letter, novel antennas with two spiral elements are presented for ultra‐wideband application. The original antenna consists of a T‐shaped microstrip feed line, two spiral radiating elements, and a ground plane with two circular slots. It measures 30 mm × 40 mm × 1.6 mm. Spiral elements are used to increase the lower bandwidth limit. To further reduce the size of the antenna, the original antenna is cut in half by using the symmetry of the surface current distributions. The proposed antennas feature omnidirectional radiation patterns and good gain flatness.