一种小型化双陷波可重构UWB天线设计

提出了一种小型化的双陷波可重构超宽带(ultra wide band,UWB)天线,通过在辐射贴片上刻蚀大、小两个C形槽,实现5G (3.3～4.4 GHz)/WiMAX (3.3～3.6 GHz)和WLAN (5.150～5.825 GHz)两个频段的陷波.采用两个PIN二极管跨接在C形槽上,通过控制PIN二极管的通...     

Compact fractal based UWB mimo antenna with dual band dispensation

Analog Integrated Circuits and Signal Processing - In this study, a fractal-based ultra-wideband multiple-input-multiple-output antenna with a compact structure is proposed. By using monopole...     

具有双频带阻特性的超宽带天线的设计

设计了一款具有双频带阻特性的超宽带微带贴片天线。天线由50?矩形微带线馈电,频率覆盖范围为2.8~12 GHz。在天线辐射贴片上端开一对C形槽,实现了对3.3~3.6 GHz的Wi MAX频段的阻隔,并且在贴片下端使用阶梯结构实现了对5.15~5.825 GHz的WLAN频段的阻隔。对天线进行了加工与测试。结果表明,该天线的一对C形槽对Wi MAX频带阻隔作用明显,而阶梯结构不仅获得了在WLAN频段的带阻特性,而且与接地板上的矩形槽共同作用,还实现了天线的宽频带特性。天线的实测结果与仿真吻合良好。     

Compact UWB monopole antenna with quadruple band notched characteristics

ABSTRACT

A compact planar Ultrawideband (UWB) monopole antenna with quadruple band notch characteristics is proposed. The proposed antenna consists of a notched rectangular radiating patch with a 50 Ω microstrip feed line, and a defected ground plane. The quadruple band notched functions are achieved by utilising two inverted U-shaped slots, a symmetrical split ring resonator pair (SSRRP) and a via hole. The fabricated antenna has a compact size of 24 mm × 30 mm × 1.6 mm with an impedance bandwidth ranging from 2.86 to 12.2 GHz for magnitude of S₁₁ < ?10 dB. The four band notched characteristics of proposed antenna are in the WiMAX (worldwide interoperability for microwave access) band (3.25–3.55 GHz), C band (3.7–4.2 GHz), WLAN (wireless local area network) band (5.2–5.9 GHz) and the downlink frequency band of X band (7–7.8 GHz) for satellite communication are obtained. The measured and simulation results of proposed antenna are in good agreement to achieve impedance matching, stable radiation patterns, constant gain and group delay over the operating bandwidth.     

一种紧凑型超宽带双陷波天线的设计

提出了一款共面波导馈电的超宽带双陷波天线.该天线主要由梯形共面地、微带馈线和圆形辐射体三部分构成.其中,梯形共面地使天线实现超宽带,圆形辐射贴片上的倒L形槽和弧形槽使天线实现陷波特性.使用Ansoft HFSS软件对所设计天线进行仿真实验,然后加工成实物天线并进行测试.结果表明:天线回波损耗及辐射方向图的实测结果与仿真...     

一种小型化四陷波超宽带天线设计与研究

为有效抑制WiMAX波段、国际卫星波段、X波段以及国际电信联盟(International Telecommu-nication Union,ITU)波段等窄带通信系统的干扰,设计了一款小型化四陷波超宽带(ultra wideband,UWB)天线.采用改进矩形作为辐射贴片,背板开鱼骨形凹槽,以及在天线结构上添加T形枝...     

Design and comparative analysis of circuit theory model-based slot-loaded printed rectangular monopole antenna for UWB applications with notch band

In this paper, a slotted printed rectangular monopole antenna (SPRMA) is proposed that covers the entire UWB (ultra-wideband) except for WiMAX and WLAN (802.11/a-n). In the first stage, a rectangular monopole antenna is designed, which covers the entire UWB frequency. Then, a T-slot is inserted in the radiating patch to have the rejection of the band containing WiMAX and WLAN (802.11/a-n). The notch characteristics of the proposed antenna are observed from 3.0 to 3.65 GHz and 4.5 to 6.65 GHz respectively. Measured peak gain of 3.28 dBi has been observed at 4.25 GHz frequency. To show the validation of antenna, mathematical analysis using circuit theory has been also given in the paper. The prototype has been also tested inside the anechoic chamber to give the validation in real-time environment. Several other reported antenna structures have also the same notch band in UWB with different notching methods. The proposed structure's radiation properties are compared with other reported structures proving the compactness of the proposed structure.     

A printed monopole ellipzoidal UWB antenna with four band rejection characteristics

An antenna design with four band rejection characteristics for UWB application is demonstrated. The proposed unique UWB antenna has shape of an embedded ellipse at top of trapezoidal patch (named as ellipzoidal), 50 Ω impedance microstrip line feed and a truncated beveled ground plane. To realize four band stop characteristics, three inverted U-shaped and a single I-shaped slots each of half guided wavelength are utilized on radiating element. The fabricated antenna has dimensions of 27 mm × 36 mm × 1.6 mm. This four band notched ellipzoidal UWB antenna has measured frequency bandwidth 2.8–14 GHz for magnitude of S₁₁ < −10 dB level. The measured ellipzoidal antenna exhibits four band rejection characteristics for magnitude of S₁₁ > −10 dB at 3.55 GHz for WiMAX band (3.26–3.9 GHz), 4.55 GHz for ARN band (4.35–5.05 GHz), 5.7 GHz for WLAN band (5.5–6.65 GHz) and 8.8 GHz for ITU-8 band (7.95–9.35 GHz). The proposed ellipzoidal UWB antenna maintains omnidirectional radiation pattern, gain, linear phase response, <1 ns group delay, and transfer function in the whole UWB operating bandwidth except at notched frequency bands.     

一种双频段圆锥喇叭天线的设计

介绍了一种双频段圆锥喇叭天线的设计.作为星载阵列天线单元的圆锥喇叭天线需要满足20/30 GHz双频段工作的需要.此处采用在光壁圆锥喇叭内加载一个外形渐变的金属柱体来改变天线的输入阻抗,调节金属柱体的尺寸,包括两端的口径和长度,可以在要求的频段得到理想的输入阻抗.仿真分析和实验测试结果说明该天线具有满意的频带特性和方向图特性.     

一种双阻带椭圆单极子UWB天线的设计

通过仿真与实际测试结合的方法,研究并设计了一种用于UWB通信的、具有双阻带特性的紧凑椭圆单极子天线。双阻带特性是通过在辐射单元上插入一个缝隙和在馈线上引入一共面波导谐振单元实现的。测试结果表明此天线在3.45~3.75 GHz(覆盖了WIMAX频段)和5~6 GHz(覆盖了5.15~5.85 GHz的WLAN频段)分别有两个阻带,此外,驻波系数在3.1~10.6 GHz UWB的范围内小于2。天线的辐射特性也近似于全向。天线的增益和传输函数也证实了天线能达到双阻带特性。     

一种新型平面结构的双陷波超宽带天线设计

为了避免现存的一些窄带通信系统对超宽带天线的干扰,提出了一种具有双陷波特性的超宽带天线结构。由于采用了渐变式阶梯阻抗匹配结构作为超宽带基础天线的馈电,使天线具有了宽阻抗匹配能力。通过在基础天线背面附加双偏T寄生单元和在辐射贴片上开窗的联合方法,实现了超宽带天线的双陷波特性。天线电流分布结果可以完全反映出在陷波频率下两种方法的谐振抑制作用,而且实验结果表明该结构的天线对 WLAN(5.15～5.825 GHz) 和WiMAX(3.4～3.69 GHz)频段的信号起到了有效的抑制作用,同时在工作频段内表现出较好的全向辐射特性。     

Implementation and investigation of U-shaped aperture UWB antenna with dual band-notched characteristics

The design and analysis of an ultra-wideband (UWB) aperture antenna with dual band-notched characteristics are presented. The antenna consists of a circular exciting stub on the front side and a U-shaped aperture on the back ground plane. By inserting a slot and a parasitic strip to the antenna, dual notched frequency bands are achieved. A conceptual circuit model, which is based on the measured impedance of the proposed antenna, is also shown to investigate the dual band-notched characteristics. The measured impedance bandwidth defined by VSWR , 2 of 9.0 GHz (2.2?11.2 GHz), with the dual bands of 3.25?4.25 and 5.0?6.05 GHz notched, is obtained.     

A low profile circularly polarized UWB antenna with integrated GSM band for wireless communication

A novel monopole antenna with wide impedance bandwidth and axial ratio bandwidth (ARBW) is presented. The proposed structure is consisting of a wide slot hexagonal shape with an L-shaped radiator coupled inside the slot. Further, two inverted L-shaped strips are protruded on the opposite corners of the hexagonal patch for better radiation capability. The radiating patch is fed by a semi hexagonal ring feed mechanism followed by a tapered line coplanar waveguide (CPW) for improving antenna performance. The proposed structure is supported by a triangular shaped ground plane. An extremely wide -10 dB impedance bandwidth of around 195% and 3-dB axial ratio bandwidth of 32.5% is achieved. The designed antenna has stable radiation characteristics within the operating band. Proposed antenna is fabricated on FR4 epoxy substrate by means of standard photolithography process and measured results are found in a good match with simulated.     

一种具有陷波特性的Vivaldi天线设计

提出了一种具有陷波特性的新型超宽带Vivaldi天线。采用双Y巴伦实现了微带-槽线过渡,利用多阶阻抗变换器解决了宽带阻抗匹配问题。通过在微带线上添加狭缝,实现了对WLAN应用频段(5.125~5.825 GHz)的隔离,使该天线具有陷波特性。在仿真设计的基础上制作了实验模型,并对其进行了测量。实测结果表明:在超宽带UWB(Ultra Wide-Band)应用频带(3.1~10.6 GHz)范围内,除隔离频带(5.1~6.0 GHz)以外,该天线的驻波比VSWR≤2,辐射方向图定向性较好,且交叉极化较低,从而证明了该天线设计的实用性。     

A compact quasi-self-complementary dual band notched UWB MIMO antenna with enhanced isolation using Hilbert fractal slot

A compact ultrawideband multiple input multiple output antenna with dual band notch characteristics is proposed. The design utilizes the property of quasi-self-complementary monopoles to achieve a bandwidth that ranges from 2.2 GHz to 11 GHz. The design has a compact size of 30 mm × 41 mm × 1.59 mm. Two quasi-self complementary half circular monopoles are symmetrically arranged to obtain MIMO antenna. Bandnotch characteristics are obtained by adding parasitic strips of Levy's Fractal shape near the feed line. A Hilbert Fractal shaped slot is etched in the ground plane to enhance the isolation (|S₂₁| < −20 dB) throughout the operational bandwidth. The measured and simulated radiation patterns are in good agreement and is found to be stable throughout the ultrawideband. Moreover, the measured peak gain is found to be 4 dBi.     

具有带阻特性的宽缝隙超宽带天线研究

根据短距离无线电通信系统对超宽带天线的要求,设计制作了矩形宽缝隙超宽带（UWB）天线,并通过加载λ_g/4开路枝节的方法实现了超宽带天线的带阻特性,分析了天线参数对其辐射特性的影响。仿真及实验结果表明：该天线满足短距离无线电通信系统对UWB天线的要求,实现了4.5~6 GHz的带阻特性,具有稳定的增益,良好的波形保真特性。该天线尺寸小、成本低且易于集成,可以作为短距离无线通信系统的收发天线。     

A circular monopole antenna for bandwidth enhancement using cylinder slots with triple band notch characteristics

This article introduces a super wideband along with three notch bands circular patch monopole antenna. The design structure is applicable for microwave and high-speed wireless devices (2.19 to 25 GHz). In order to create a broad band, a ring dimension circular patch is used. To generate three notch bands, six symmetrical tiny cylinder stubs are introduced on the ground. These notch band frequencies can eliminate unwanted interference from various wireless frequencies, which mainly cover three notch bands: 5.5–7.3, 12.05–14.46, and 17.71–19.5 GHz. The steady radiation, super bandwidth, and stable gain properties expand when the ring patch and line feed are combined. It is excellent for many UWB applications because of its compact size (39 × 29 mm ²) and large bandwidth (166.97% fractional bandwidth). This model employs various size reduction and matching approaches to get a better response. The mechanisms of these structures are identified, and overall performance is compared with parametric analysis, tables, and figure.     

基片集成波导双极化多波束天线的设计

提出了一种基于基片集成波导技术的双极化多波束天线设计方法,利用Butler矩阵作为波束成型网络,通过激励成对的正交缝隙辐射单元组,实现双极化多波束辐射特性。通过配置正交辐射单元组之间的相位关系为同相或反相,可以分别实现极化共波束和极化独立波束的多波束辐射特性,从而适应不同无线通信场景需求,利用空间波束分集或极化分集方式提升无线通信容量。最终,在X波段给出了一种基于基片集成波导技术的双极化独立波束的多波束天线设计实例,仿真结果表明该天线阻抗带宽为9.64~10.25 GHz,对4个输入端口分别激励时可实现双极化四波束辐射,波束增益为14 dBi,验证了所提出的设计思想和方法。