Ku波段宽带高增益基片集成腔圆极化阵列天线北大核心CSCD

提出了一款应用于Ku波段的宽带高增益基片集成腔(Substrate Integrated Cavity,SIC)圆极化阵列天线。通过引入沿SIC口径面对角线放置的一对半月形寄生贴片和SIC底部馈电纵缝,使SIC中的TM_(211)和TM_(121)谐振模式幅值相等、相位相差90°,产生高增益圆极化辐射。同时,双寄生贴片还引入了一种背腔缝隙耦合振子圆极化辐射模式,扩宽了天线高增益圆极化辐射带宽。在此基础上,设计了一款2×2单元顺序旋转馈电的SIC圆极化阵列天线。阵列天线采用双层基片集成波导顺序相移馈电网络进行馈电,进一步增大了天线的圆极化带宽。综合考虑天线的-10 dB反射系数带宽、3 dB轴比带宽和3 dB增益带宽,测试结果表明,圆极化阵列天线的有效带宽为10.74-13.30 GHz(21.3%),在通带范围内最大增益为14.50 dBi。     

一种小型化宽带圆极化微带天线的设计

设计并加工了一种采用同轴背馈方式馈电的小型化宽带圆极化微带天线。针对单点馈电微带天线轴比带宽窄的问题,通过增加馈电网络对天线辐射贴片进行双点馈电以展宽轴比带宽,得到了良好的效果。馈电网络根据带状线理论设计,利用U形接地板巧妙地实现了宽带天线的结构小型化。通过对辐射贴片的双点馈电获得了令人满意的电压驻波比带宽和良好的圆极化性能。通过仿真和实际测试表明,该天线VSWR≤2的带宽达到了30％,3dB圆极化带宽约为26％,同时频带内天线的增益达到4dB。     

小型化缝隙加载圆极化及宽带微带贴片天线设计

提出了一种十字形缝隙加载的小型宽带及圆极化微带贴片天线的设计方法。该天线通过在方形贴片上加载一个大尺寸的十字形缝隙实现天线的尺寸缩减,介质基片采用由FR4和空气层组成的层叠结构,在缝隙中嵌入L型枝节,只需通过调整枝节上同轴线馈电点的位置来获得圆极化或宽带阻抗匹配。ANSYS HFSS仿真分析表明,天线的圆极化带宽（AR≤3 dB）为1.7%,阻抗带宽（VSWR≤2）为5.8%,天线在宽带范围内具有稳定的增益,峰值增益为7.8 dB,同时贴片面积缩减了52.3%。改变馈电点的位置可调节两个谐振频率使天线阻抗带宽达到9.4%,比传统的微带贴片天线阻抗带宽提高了114%。     

一种非谐振宽带高增益部分反射面天线

介绍一种非谐振的宽带高增益部分反射面天线。该天线由一个线-圆极化转换超表面、一个宽带耦合馈电天线和金属地组成。部分反射面和金属地板构成的腔体处于非谐振状态,通过旋转部分反射面上层的圆极化贴片对泄露的电磁波进行相位校正,可实现高增益和宽带圆极化的性能。仿真结果表明,天线3 dB轴比带宽和3 dB增益带宽分别为10.37～13.52 GHz(26.37%),11.21～12.99 GHz(14.71%),同时,天线在12.4 GHz实现20.23 dBic的峰值增益,口径效率为34.11%。     

基于SP馈电网络的超宽带圆极化天线设计

提出了一种基于顺序相移(SP)馈电网络的宽轴比圆极化微带阵列天线。该天线通过将四个相同的圆形贴片辐射器连接在SP馈电网络的输出端,形成2×2微带阵列天线以实现圆极化性能。为保持馈电网络的紧凑性和圆形贴片辐射器的宽带特性,设计了一种不规则局部接地的方法。为获得天线的定向辐射并提高增益,在介质基板下方7.4 mm处设置一金属反射板。经过HFSS仿真软件优化分析,所提出天线的总尺寸为65 mm×65 mm×8 mm,小于-10 dB阻抗带宽为5～8.6 GHz(52%),3 dB轴比带宽为5.72～8.16 GHz(35%),在圆极化工作频率范围内增益可达10～12 dB。对所提出天线进行实物加工与测试,测试结果和仿真结果较吻合。     

一种CPW馈电圆形缝隙宽带圆极化天线

设计了一种共面波导(CPW)单端口馈电的圆形缝隙宽带圆极化(CP)印刷天线。该天线通过在圆形缝隙侧面附加圆形枝节,结合CPW端口伸出的激励带条,激励出一对相位差90°的差分正交简并模,从而辐射圆极化波。对天线模型进行了优化设计和实物加工,测试结果表明,该天线的轴比带宽(AR<3dB)达到12.5%;最大增益为3.8dB,在轴比带宽内增益的变化幅度小于1dB。     

一种新型高增益宽带圆极化天线阵列的设计

分析了一种具有高增益的宽带圆极化天线。每一个单元都是双面印刷偶极子,为了展宽带宽,采用了宽频带90°巴伦作为馈电网络用于给偶极子阵列馈电。在此基础上,制作了一个2×3 元小型圆极化平面阵,为了压缩尺寸,将馈电网络位于介质板的底层,该天线最高增益可以达到14.2dBi,并可以获得64%（VSWR<2）的阻抗带宽和54.5%（AR<3） 的轴比带宽。     

一款双频双宽带双圆极化Fabry-Perot谐振腔天线

文中设计了一款双频双宽带双圆极化的法布里-珀罗（FP）谐振腔天线。传统的FP天线具有高增益特性但是难以实现宽带及双频带工作，为了改善其性能，提出一种具有双频正相位梯度的部分反射表面，利用其正相位梯度特性弥补电磁波频率升高带来的空间相位变化，从而在较宽的带宽内满足FP天线的谐振条件以实现宽带辐射。通过加载寄生贴片以及缝隙耦合馈电的方式设计宽带圆极化馈源，并且采用人工磁导体结构替代传统的金属地板，在同一谐振腔高度下满足两个频段的谐振条件，简化了双频FP天线的结构。全波仿真结果表明，所提出的FP天线3 dB轴比带宽分别为10.1%和13.8%，峰值增益达到12.45 dBi和11.9 dBi,3 dB增益带宽分别为11.5%和14.8%。     

一种超宽带半球柱面螺旋天线的研究

研究了一种等弧距单臂半球柱面螺旋天线，其具有宽带、小尺寸、圆极化、低剖面等特点.该天线采用半球柱面螺旋天线结构，通过在馈电端引入等效L节匹配网络进行阻抗变换，扩展天线带宽，最终实现了天线的小型化、圆极化及超宽带.利用HFSS仿真软件对半球柱面螺旋天线结构参数进行优化，仿真及测试结果表明，该天线具有超过30%的阻抗带宽及超过20%的轴比带宽，最高增益能够达到9 dB，具有良好的辐射特性.     

低剖面宽带圆极化天线阵列

基于双馈双线极化微带天线,结合威尔金森功分器、T形结功分器及顺序旋转馈电的优点,设计了一种新型低剖面宽带圆极化2×2天线阵列。把辐射贴片和馈电网络集成在同一介质层,有效地利用了介质空间,降低了天线的剖面,增加了天线的带宽。4个天线单元顺序旋转90°,利用一分四T形结功分器给4个单元等幅、相位依次相差90°馈电。根据Ansoft''s HFSS仿真结果,制作了样机。样机实测结果和仿真结果吻合。实测结果表明,该天线阵驻波带宽可以达到27.78%,3-dB轴比带宽可以达到52%,最大增益为14.19 dB。     

Design of an Ultra‐Wideband Antenna Using a Ring Resonator with a Notch Function

This paper describes an ultra‐wideband (UWB) antenna that uses a ring resonator concept. The proposed antenna can operate in the entire UWB, and the IEEE 802.11a frequency band can be rejected by inserting a notch stub into the ring resonator. The experiment results indicate that the measured impedance bandwidth of the proposed antenna is 17.5 GHz (2.5 GHz to at least 20 GHz). The proposed UWB antenna has omnidirectional radiation patterns with a gain variation of 3 dBi (1 dBi to 4 dBi).     

3.5/5.5 Ghz dual band-notch ultra-wideband antenna

A compact and simple design of a CPW-fed planar antenna for ultra- wideband application with dual band-notch characteristics is presented. The proposed antenna yields an impedance bandwidth of 3.1- 10.6 GHz with VSWR < 2, except the bandwidths of 3.3-3.9 GHz for WiMAX and 5-6 GHz for WLAN. The antenna is successfully simulated, designed, and measured, showing broadband matched impedance, stable gain and omnidirectional radiation patterns.     

一种宽频带共形天线的特性研究

设计了一种具有宽频带特性的柱面共形天线,通过改变柱体曲率半径、长度和介电常数等参数,详细分析了其变化对共形天线性能的影响。结果表明:柱体各个参数的变化会导致天线的谐振频率、阻抗带宽以及辐射特性发生显著的改变。对设计宽频带共形天线时共形载体的选取提供了可靠依据。实际加工制作了天线,测量结果表明:该天线具有宽频带特性,可用频段覆盖2～16GHz,在工作频段内具有较好的辐射特性,增益稳定。     

一种CPW馈电的宽频带柱面共形天线的设计

设计加工了一种宽频带柱面共形天线,采用共面波导( CPW)形式对其进行馈电.对比了平面天线的特性变化,分析了柱体曲率半径对天线阻抗特性和辐射特性的影响.测量结果表明,该天线具有宽频带特性,可用频段覆盖1.8～11.2GHz,在工作频段内具有较好的全向辐射特性,增益稳定.     

A novel wideband and circularly polarized cross‐dipole antenna

In this paper, we present a novel wideband circularly polarized (CP) composite, called cavity‐backed crossed dipole antenna for 2.45 GHz industrial, scientific, and medical (ISM) band wireless communication. To excite the CP radiation effectively, a curved‐delay line providing an orthogonal phase difference among the cross‐dipole elements is attached at corners of the sequentially rotated elements. By choosing a proper radius of the curved‐delay line, a wide input impedance of the antenna can be realized. Unlike conventional cross‐dipole antennas, the proposed cross‐dipole antenna is designed with an open stub added to the radiating arms of the dipole so that both impedance and axial ratio bandwidths are enhanced. The antenna is center‐fed by a 50‐Ω coaxial cable and is placed above a cavity‐backed reflector to obtain a directional CP radiation pattern. With the advantage of being center‐fed, a symmetric CP radiation pattern can be achieved across the entire operating bandwidth. To further improve the directivity and the radiation pattern, a rectangular cavity‐backed reflector is used. Simulated and measured results confirm that the proposed antenna has good CP characteristics. The proposed antenna obtains a broad 3‐dB axial ratio bandwidth of 49% (1.20 GHz, 1.96–3.16 GHz) and an impedance bandwidth of 67.7% (1.66 GHz, 1.69–3.35 GHz) for reflection coefficient (S₁₁) ≦ −10 dB. It also yields an average CP gain of 9.2 dBic across the operating bandwidth and a peak CP gain of 10 dBic. Copyright © 2016 John Wiley & Sons, Ltd.     

Printed Planar Monopole Antenna Design for Ultra-Wideband Communications

This paper presents an ultra wideband (UWB) planar printed monopole antenna fed by microstrip line. The antenna configuration contains a beveled ground plane. The beveled partial ground plane improves the impedance bandwidth. The measured frequency response demonstrates that the fabricated antenna exhibits an impedance bandwidth of 7.9 GHz over 3.1 to 11 GHz for VSWR < 2. The proposed antenna has ultra-wideband characteristics with omnidirectional radiation pattern and stable gain. Ultra-wideband performance of the proposed antenna is examined through the simulated surface current distributions. Measured results confirm that the antenna is suitable for UWB applications due to its compact size and high performance characteristics.     

Narrow and wide band monopole antenna design using heterogeneous bidirectional recurrent neural network for LTE and UWB applications

The proposed antenna is a small wideband monopole with wideband circular polarization using heterogeneous bidirectional recurrent neural network for both narrow and wide band applications (NWB-MAD-HBRNN). The electromagnetic structure is designed, fabricated, and simulated with 1 mm thickness on FR4 substrate material along dielectric constant 4.3. The proposed antenna includes 4.3–8.85 GHz for ultrawideband applications; it contains reconfigurable narrow band for L-band 1.27 GHz, LTE, and ultrawideband applications. To enhance the antenna impedance bandwidth (BW) along axial ratio bandwidth (ARBW), a slit is etched at the antenna patch, a rectangular stub is inserted into the ground plane, and semicircular stub is added to the top of antenna feed line. The better agreement is observed in the measured and simulated gain performance of 4.8 dB for LTE band applications. The proposed NWB-MAD-HBRNN design provides 13.50%, 18.91%, and 22.58% higher bandwidth and 18.36%, 20.38%, and 27.58% lower return loss than the existing designs, such as bio-inspired wideband antenna for wireless applications based on perturbation technique (BWA-WA-PA), a compact circularly polarized modified printed monopole antenna for wireless applications (CCP-MPMA-WA), and new multiband monopole antenna for certain broadband wireless applications along wireless personal communications (PA-MMA-BWA), respectively.     

A NEW DESIGN METHODOLOGY FOR PRINTED LOG-PERIODIC MONOPOLE ANTENNA

In theory, Log-Periodic Antenna (LPA) is a linearly polarized antenna with frequency independent properties on the input impedance and gain patterns. Owing to these characteristics, LPA has gained research interests and been employed for many wideband applications. A Printed Log- Periodic Dipole Antenna (PLPDA) with multiple notched bands is proposed for Ultra-WideBand (UWB) applications. An antenna with the notched frequencies of 1.03 GHz, 1.28 GHz, 1.72 GHz, 2.24 GHz and 2.51 GHz is designed, fabricated, and measured. An antenna model was established on the substrate of FR4 and feed by a stripline. The simulation results show that the antenna can achieve an impendence wide bandwidth from 0.89 to 2.58 GHz with return loss less than –10 dB and exhibit stable antenna gain. Furthermore, the measurement result is better consistent with simulation result.     

Coplanar waveguide fed wideband slot antenna

A new design for a coplanar waveguide (CPW) fed slot antenna is presented. The impedance matching and the radiation characteristics of this structure were studied using the method of moment technique. This antenna has an impedance bandwidth (for a VSWR<2) of 49% and a radiation bandwidth of 42% about its 4.8 GHz centre frequency, compared to the 12-20% impedance bandwidth of the standard CPW fed slot antenna. The cross-polarisation in both the principle planes is at least 20 dB below co-polarisation across the entire bandwidth. Simulated and measured results of the antenna are presented. This wideband antenna has significant applications in wireless technologies     

新型宽带U型缝贴片天线阵

该文介绍了一种性能优良的四元U型缝贴片天线阵。该阵面由一新型的宽带匹配网络馈电,能量通过地板上的馈电缝耦合到上面的U型缝贴片上。这种类型的天线阵可以在10.4-16.7GHz的频率内工作,阻抗带宽达46.5%,最大增益为15dBi,增益在13dBi以上的频率范围达30%,交叉极化电平在整个频带内均小于-18dB。