K波段低副瓣波导缝隙驻波阵设计

本文设计了一种 K 频段低副瓣波导缝隙驻波阵天线,给出了实现低副瓣的方法。设计副瓣电平为-27dB,缝隙幅度分布按-30dB 泰勒分布计算,结合高频仿真软件 Ansoft HFSS 对各缝隙归一化导纳进行计算,建立仿真模型并优化天线各参数。依据设计结果加工实物并测试其方向图及增益。测试结果表明,该天线在工作频带内波束宽度约 3°,副瓣电平小于-27dB,工作频带内增益大于 30.8dB,仿真结果与实测结果相符,设计满足指标要求。     

V形微带缝隙天线

提出了一种新颖的V形微带缝隙天线,地板上开一个直角V形缝隙,在V形缝隙的顶角处附加一个小直角三角形补偿隙,通过改变三角形补偿隙面积的大小可以对天线阻抗匹配进行优化,由基片另一侧的箭形微带线终端对缝隙单元馈电。这种天线易于实现宽带特性,设计简单,便于加工。文中给出了天线阻抗和方向图的计算结果,并给出了反射损耗和增益的实验结果。实测结果表明,该天线的阻抗带宽达到了43%,覆盖了1146~1776MHz的频率范围,-10dB阻抗带宽内增益值在4.5~6.5dB之间,平均增益约为5.5dB。     

超短波宽带双偶极全向天线研究

现役超短波电台天线在低频段有效增益低,影响了电台的通信距离,为此提出了一种超短波双偶极全向天线。从理论上对天线的阻抗特性和天线的方向特性进行了详细分析计算,并实现了工程样机。试验测试数据表明:此天线具有宽频带特性,在整个工作频带内其电压驻波比小于2.5,有效增益比常用的超短波中馈天线提高2.8dB左右,是一结构简单、性能良好、适用于30～88MHz频段工作的宽带全向天线。     

Compact linear tapered slot antenna for UWB applications

A novel ultra-wideband (UWB) antenna consisting of a linear tapered slot in the ground plane and a microstrip to slotline transition is investigated. The antenna possesses a wide bandwidth from 2.95?14 GHz for |S₁₁| < - dB and shows stable radiation patterns with an average gain of 3 dBi throughout the band. Measured group delay and transmission characteristics indicate that the antenna has good pulse handling capabilities.     

Ku波段多频高增益天线研究

针对传统平板天线频带单一,增益不高,方向性差等缺点,本文将电磁波的增强透射特性研究应用到天线的设计中,结合类f-p腔原理,设计了一款具有双频带、高增益的波导缝隙天线。天线在中心频率10.9 GHz和13.7 GHz的增益分别达到了10.8 dB和11.4 dB,并且相对于传统单缝波导天线,天线在中心频率点处E面的半波功率波束宽度分别减小了114°和90°。仿真结果和实测结果吻合度较高,尤其频带处于在Ku波段,在卫星雷达领域具有很大的应用价值。     

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.     

低雷达截面的超宽带Koch分形槽缝天线

设计了一种具有低雷达截面的超宽带分形槽缝天线。利用"突出角"为90°的Koch分形对方形槽天线进行3次迭代设计后,-10dB阻抗带宽范围由方形槽缝天线的3.0～13.1GHz变为2.8～13.7GHz。仿真和测试结果显示,天线在3GHz和8GHz方向图对称,在整个频段内相对于原天线的增益更稳定,且具有较低的雷达散射截面(RCS)。该天线适用于对超宽带天线具有低RCS要求的场合。     

基于尺寸渐变超表面宽带高增益低剖面天线

设计了一种基于尺寸渐变超表面的宽带高增益低剖面天线,该天线由双层超表面和一层微带缝隙组合而成。双层超表面由分别印刷在2个介质板上的尺寸渐变六边形阵列贴片组成,贴片之间存在非等距间隙。超表面单元尺寸渐变设计能够使天线产生多个邻近的谐振点,从而展宽带宽。通过改变超表面天线尺寸结构,分析天线的宽带辐射特性。为获得最佳宽带性能,采用遗传算法优化天线几何参数。制作并测试了一款边长为43.3 mm,厚度为4.853 mm的样本天线用于验证仿真结果。实测结果显示,该天线-10 dB阻抗带宽达到了54%(3.99～6.93 GHz),最高增益达到12.05 dB,在4～6 GHz范围内增益保持在8 dB以上。该天线实现了宽频带、高增益、低剖面的特点,适用于宽带高速率无线通信的诸多领域。     

一种新型的超宽带锥削缝隙天线设计

提出了一种微带线-槽线馈电形式的指数锥削缝隙天线,在辐射臂的外边缘引入半椭圆形缝隙来进一步提高天线低频段的定向性,获得了高增益和超宽带性能。利用HFSS12软件进行仿真,天线的极化方式为垂直极化,在2~13 GHz的工作频段内电压驻波比＜2,增益最高达11 dB,具备良好的定向性,仿真与实测结果基本吻合,表明该设计是有效、可行的。     

一种基于5G应用的圆极化微带相控阵天线

本文提出一款应用于5G频段,可实现方位面±40°波束扫描的圆极化微带相控阵天线。该相控阵天线单元是由矩形贴片、上下介质板、缝隙耦合馈电结构、金属反射板构成。利用切比雪夫综合法的一分八不等分功分器实现相控阵天线的馈电形式。测试结果表明,阵列天线的驻波比带宽为3.25 GHz～3.69 GHz,端口隔离度大于25 dB,扫描过程中增益最大为21 dB,增益衰落小于3 dB,最大扫描角处轴比为2.89 dB。该天线具有低剖面、高隔离度、高增益以及良好的波束扫描性能等优点。     

一种双频双圆极化共面波导馈电缝隙天线

一种新型加载两个开口环形接地导带的双频共面波导（CPW）馈电缝隙天线,被提出来实现双旋向圆极化辐射。从天线信号带伸入槽隙的水平矩形调谐短截线用于改善频带内的阻抗和轴比。对天线进行仿真和实物测量。实验结果表明,该天线的10 dB 回波损耗阻抗带宽分别是,在1.55 GHz 频段为27.69％（1.4~1.85 GHz）,在2.55 GHz频段为26.17％（2.075~2.7 GHz）。在1.55 GHz的频段和2.55 GHz频段所测量的3 dB轴比带宽分别是20.51％（1.4~1.72 GHz）和13.44％（2.36~2.7 GHz）。其辐射极化方向分别是低频段右旋圆极化和高频段左旋圆极化,天线在两频段内的峰值增益分别是3.69 dB和3.81 dB。实物测试结果与仿真结果基本吻合。     

CPW馈电缝隙耦合蝶形毫米波贴片天线

该文研究了一种工作在Ka波段共面波导(CPW)馈电缝隙耦合的蝶形贴片天线。耦合缝隙位于接地板上,而不需要额外的缝隙耦合层,使天线更易与电路相集成。耦合缝隙的存在改变了接地板上原有表面电流的分布,使电流沿着缝隙边缘流动,因此馈线与辐射源的电磁耦合效率得到提高。用有限元分析软件(Ansoft HFSS)对衬底厚度、贴片角度、耦合缝隙大小等参数变化时的天线性能进行了仿真。比较并分析了S11,增益等天线性能参数的变化规律,并在带宽最优的条件下给出了一组参数值,此时天线的工作频率为35.5GHz,带宽为1.22GHz,增益为6.38dB。     

RCS reduction and gain enhancement of SRR inspired circularly polarized slot antenna using metasurface

In this work, a novel Circularly Polarized (CP) slot antenna is proposed for low RCS and high gain applications. The proposed antenna is designed in two phases. Initially, a metasurface is designed, which is composed of two similar artificial magnetic conductor (AMC) unit cells arranged orthogonally in chessboard-like configuration for broadband RCS reduction. Then, the CP slot antenna is designed by placing dual SRR on the backside of the slot for impedance matching and to achieve circular polarization. Detailed analysis is conducted to investigate the performance of metasurface loaded CP slot antenna. The proposed antenna shows 10 dB RCS reduction over the bandwidth of 41.3% at boresight direction compared to CP slot antenna. The maximum in-band and out-of-band RCS reduction achieved is 24 dB and 20 dB, respectively. The maximum gain of the antenna is also increased by 2.7 dB as a result of parasitic radiation of the metasurface and an improvement in overall performance of the antenna is observed by the employment of metasurface. Measured results of the fabricated prototype are in good agreement with the simulated results.     

Wideband CPW-fed slot antenna for DCS, PCS, 3G and Bluetooth bands

A novel CPW-fed wide planar slot antenna with an asymmetrical slot is proposed. The asymmetrical slot is square-like with the same widths but different lengths at the sides. By choosing suitable lengths of this asymmetrical slot, broadband operation can be obtained. From experimental results, the measured impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 2136 MHz with the centre frequency operating at 2610 MHz for applications to various wireless bands. In addition, the measured radiation patterns within this wide impedance bandwidth have the same polarisation planes and similar radiation characteristics. Each antenna gain within the application bands can be less than 1 dB     

Analysis of L-Shaped Slot Loaded Circular Disk Patch Antenna for Satellite and Radio Telecommunication

In the present paper a dual frequency resonance antenna is achieved by introducing L- shaped slot in circular disk patch. It is analysed by using circuit theory concept. The resonance frequency is found to be 5.087 and 8.455 GHz and the 10 dB bandwidth of the proposed antenna for lower and upper resonance frequency is found to be 4.39 and 4.66 % respectively. It is easy to adjust the higher and lower band by changing the dimensions of notch and slot introduced in the antenna. The frequency ratio is found to be 1.6621. The gain and efficiency of the proposed antenna is found to be 9.50 dB at lower resonance however it is 7.0 dB at upper resonance frequency whereas the efficiency at lower and upper resonance is found to be 94.6 and 88.2 %.The theoretical results are compared with IE3D simulation results which are in good agreement.     

基于超表面的低剖面高增益圆极化天线

提出了一种基于缝隙耦合超材料表面的低剖面圆极化高增益天线,该天线由一个超材料表面和一个微带缝隙天线紧贴着组成.通过改变超表面切角的大小来产生圆极化波,同时还可以提高天线增益和拓宽阻抗带宽.为了验证仿真结果,制作和测量了一个大小为1λ×1λ×0.067λ(在10 GHz处)的样本天线,仿真和测量结果显示出良好的一致性.结...     

Slot antennas on photonic band gap crystals

The radiation patterns of a slot antenna placed on a photonic band gap crystal have been measured. We used a layer-by-layer photonic band gap crystal having a three-dimensional stop band between 12 and 15 GHz. The slot antenna radiation depends sensitively on the relative position and orientation of the slot in the surface unit cell of the photonic crystal. We have found configurations of the slot antenna with an increase of radiated power by 2-3 dB. The photonic band gap crystal can considerably improve the performance of a simple slot antenna     

微带线-槽线馈电缝隙等角螺旋天线设计

被动雷达导引头为探测与跟踪目标可采用宽带等角螺旋天线,针对降低等角螺旋天线剖面,该文提出一种低剖面背腔式微带线-槽线馈电缝隙等角螺旋天线。微带线-槽线巴伦(Balun)中渐变微带线将同轴线激励的不平衡电场最终转化为槽线处平衡电场。实测结果表明,该缝隙等角螺旋天线实现了1:9的电压驻波比(VSWR)带宽,良好的辐射方向图与圆极化特性。在天线背面加入高度仅有0.05L(L为最低工作频率所对应自由空间中波长)的反射腔,腔内放置矩形环状吸波材料,有效拓展了天线低频段带宽。测试结果表明带有反射腔的缝隙等角螺旋天线实现了1:6.4的电压驻波比带宽,天线增益大于4 dB,良好的圆极化与方向图特性。平面化、一体化的馈电方式与低剖面反射腔有效降低了缝隙等角螺旋天线剖面,测试结果验证了该文所提出的微带线-槽线巴伦馈电缝隙等角螺旋天线设计方法的有效性。     

A miniaturized metamaterial slot antenna for wireless applications

A novel miniaturized five band metamaterial inspired slot antenna is reported. The proposed design consists of a ring monopole and metamaterial Rectangular Complementary Split Ring Resonator (RCSRR) as the radiating part, two L and one T–shaped slot as the ground plane, respectively. Miniaturization in the proposed design is accomplished by metamaterial RCSRR, and also, it helps the antenna to operate at 2.9 and 5.2 GHz frequency bands. The aforementioned miniaturization process leads to about 46.8% reduction in volume of the proposed design, as compared to the conventional antenna. The pass band characteristics of the metamaterial RCSRR through waveguide medium are discussed in detail. In order to enhance the operating abilities of the miniaturized antenna, slots are etched out in the ground plane, thereby making the miniaturized antenna further operate at 2.4, 5.6 and 8.8 GHz, respectively. The proposed design has an active patch area of only , with dB bandwidth of about 4.16% (2.35–2.45 GHz), 5.71% (2.63–2.76 GHz), 10.25% (4.44–4.92 GHz), 6.25% (5.42–5.77 GHz) and 2.39% (8.68–8.89 GHz) in simulation, and about 6.86% (2.25–2.41 GHz), 5.01% (2.55–2.7 GHz), 9.16% (4.58–5.02 GHz), 5.38% (5.79–6.11 GHz) and 5.42% (8.44–8.91 GHz) in measurement. The antenna has good impedance matching, acceptable gain and stable radiation characteristics across the operational bandwidths.     

A 42‐GHz Wideband Cavity‐Backed Slot Antenna with Thick Ground Plane

We investigate the characteristics of a wideband and high‐gain cavity‐backed slot antenna in terms of the reflection coefficients, radiation patterns, and gain. A cavity‐backed slot antenna structure includes baffles, reflectors, and thick ground planes. The measured gain and bandwidth of a 10‐dB return loss in a cavity‐backed 2 × 2 array slot antenna with h₁=2 mm, d = 2 mm are 15.5 dBi and nearly 27% respectively, at 42 GHz. Baffles and reflectors are used to increase antenna gain, thus reducing the coupling among the slots on the thick ground plane.