一种新颖的宽带圆极化单极天线

该文设计了一种新颖的宽带圆极化单极子天线,该天线采用微带馈电模式。天线由C型贴片和改进的地板组成,整个天线尺寸仅为25×25×1 mm3。通过在C型贴片上切角和在地板上增加三角形微扰结构,可以有效增加天线的阻抗带宽和轴比带宽。该文给出了天线的设计流程,从表面电流分布分析了圆极化天线的工作机理。加工了天线实物,并对其进行了测量。仿真和实测结果表明天线具有超宽的阻抗带宽和轴比带宽。天线的工作频带为4.35～12 GHz(相对带宽为93.6%),3 dB轴比带宽为4.15～11.8 GHz(相对带宽为95.9%)。测量了天线的辐射性能和增益特性,实测结果与仿真结果吻合较好,证明了该天线的有效性。该天线可以应用于超宽带无线通信系统和卫星通信系统中。     

宽带平板天线的设计与仿真

基于CST软件设计了一种宽带平板天线,在由4个偶极子组成的阵列下方放置一块金属反射板形成定向天线,通过在平板上采用周期结构反射器来扩大天线的带宽,并结合这种方法,设计了工作在760 MHz～1220 MHz的大线,在此频段内VSWR ＜2,增益高达10.5 dBi.该天线的带宽很宽,且定向性很好,具有广阔的应用前景.     

一种寄生阵列宽带圆极化天线的设计

该文设计了一款C波段单馈寄生阵列的宽带圆极化天线。此天线采用紧邻的双层F4B介质基板,通过在方形驱动贴片上开槽及采用寄生阵列的设计实现了圆极化。对天线结构的设计步骤进行说明,研究了各结构对天线阻抗带宽和轴比带宽的影响,并研究了寄生贴片切角长度和驱动贴片上的缝隙宽度对天线轴比和带宽的影响。对天线的圆极化方向图进行了仿真。仿真结果表明,在5.5 GHz时实现了右旋圆极化,最大增益为8.1 dBi。加工并测试了宽带圆极化天线,测试结果与仿真结果基本相符,天线实测的阻抗带宽为1.3 GHz,轴比带宽为1.26 GHz。设计的叠层天线具有结构紧凑,装配简单和轴比带宽大的优点。     

一种宽频带介质谐振器天线的设计与实现

摘 要：带宽拓展,一直以来是介质谐振器天线研究重要内容之一。基于此,本文设计了一款宽频带介质谐振器天线。采用共面波导馈电的单极天线与介质谐振器天线的混合结构,通过调节谐振器尺寸和共面波导的结构,使各个工作模式的频带互相重叠,展宽所设计天线的带宽;同时地板上引入开槽技术,对馈线进行阻抗匹配。利用仿真软件对天线参数进行优化仿真,实现天线频带宽度为2.98-7.18GHz（S11<-10dB）,相对带宽达到84.3%,带内最大增益达到4.9dBi。对该天线进行加工测试,仿真与测试基本吻合,结果表明,该天线不仅可实现宽频带,且结构简单,尺寸小,易集成,可广泛应用于WLAN/WIMAX等通信领域。     

Dual frequency wire antennas

A new type of dual frequency antenna is introduced by combining a helical and a monopole antenna. The antenna configuration is shown to operate at two discrete frequencies. i.e. ~900 and 1800 MHz. The size of the antenna configuration can be decreased at the cost of the bandwidth. The bandwidth is shown to increase by adding a reactive matching network to the antenna     

一种结构新颖的半贴片宽带微带天线

设计了一种结构新颖的半贴片宽带微带天线。通过在圆形贴片上刻蚀两对环形槽,实现宽带特性,并在原有设计好的矩形贴片沿着馈电点所在的中轴线切掉一半贴片,减少了贴片一半面积,减小了尺寸。设计了这样一种半贴片宽带微带天线,不仅具有与原来全贴片基本相同的带宽特性,并且方向图与原天线基本相同,而且大大减小了天线尺寸。     

应用于带有闭合金属边框手机的缝隙天线

提出了无断开(闭合)金属边框情况下平面手机天线的模型,解决了在闭合金属情况下导致的传统平面天线带宽变窄的问题.通过天线折叠技术,将其面积缩小至手机应用的尺寸内.然后,进一步的阻抗匹配使在smith圆图上将天线的阻抗带宽调到了最大,使天线能够覆盖GSM850、GSM900、DCS、PCS、UMTS 5个频段.采用开槽天线将金属边框作为天线的一部分能解决金属框对天线的影响.实测结果表明,低频部分带宽为142 MHz,高频部分带宽有480 MHz,满足了常用频段的需要.同时,为了避免发生手握的影响,金属框和地的接地点置于电路基板顶段,从而降低了手握的影响.     

一种带有新型馈电结构的宽带印刷角锥四臂螺旋天线

本文提出一种新型馈电结构的印刷角锥四臂螺旋天线。通过采用柱面共形结构馈电网络,与传统四臂螺旋天线相比极大地减小了地板安装面积及改善了阻抗带宽和轴比带宽。S11小于-10dB的阻抗带宽可达39.7%,3dB轴比带宽约22%。测试与仿真结果吻合良好。     

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...     

Stacked shorted patch antenna with tilted parasitic radiator

A new compact but wideband patch antenna is presented. Compact dimensions are obtained by using a shorted patch. The antenna bandwidth is increased by using a stacked patch configuration. Further increase in bandwidth is obtained by tilting the parasitic patch. The antenna prototype is fabricated and its input impedance and radiation patterns are measured     

一种宽带微带八木天线的设计

针对传统八木天线体积过大,难以与其他载体共形,相对带宽很窄的问题,设计了一种宽带微带八木天线。天线采用一种比较简单的馈电方式减小天线的尺寸,利用附加寄生贴片、振子耦合枝节和金属化孔的方式展宽频带和改善天线的阻抗匹配。使用Ansoft公司高频结构仿真器(HFSS)对天线进行仿真设计和优化,并对实物进行测试。最后结果表明,所设计、制作的天线频段在1.81~2.57 GHz内,电压驻波比(VSWR)小于2,相对带宽为31%,在2.4 GHz频率处的增益大于9 dB。仿真和测试结果显示,该宽带微带八木天线基本达到设计要求。     

一种微带准八木天线的改进设计*

在RamadanA.Alhalabi设计的准八木天线基础上进行了改进设计,采取增加展宽天线带宽的两个寄生贴片和振子耦合枝节和提高天线增益的天线背面引向振子组,减小天线体积的馈线结构等改进措施,从而达到展宽天线相对带宽的目的.使用Ansoft HFSS软件对改进天线进行仿真实验和对实物天线进行测试,结果表明:这种改进型天线结构设计合理,其相对带宽都大于20％ (VSWR≤2),在2.4GHz处的增益都大于10dB,天线具有良好的性能,从而拓宽了该准八木天线的应用范围,而且紧凑的结构和较小的尺寸便于天线组阵.     

一种新型超宽带单极子天线设计与仿真

通过单极子和高介电常数(相对介电常数为38)陶瓷介质谐振器的耦合设计了一种新型类齿状UWB单极子天线,以实现天线超宽频带的目的。采用软件HFSS进行仿真,并对天线模型参数进行优化,得到最佳设计效果。结果表明,该天线频带宽度为2.6~20.0 GHz(S11≤–10 dB),相对带宽达到了154%,满足超宽带天线要求。该天线实现小型化超宽带的同时,在整个UWB匹配频段内,具有良好的驻波比和方向图特性,较好地兼顾了各方面的性能。     

Broadband circularly polarised hexagonal slot antenna excited by a tapered microstrip feeder

In this article, a broadband circularly polarised slot antenna fed by a single microstrip line is implemented. The proposed antenna is composed of an unequilateral hexagonal slot to implement circular polarisation and tapered microstrip feeding line to enhance the impedance bandwidth. A conducting reflector is also employed to enhance the antenna gain. The proposed antenna, 60 mm × 60 mm × 18.12 mm in size, was fabricated and tested. The measured??10 dB reflection bandwidth and 3 dB axial ratio bandwidth were 48.9% and 17%, respectively. The measured gain of the fabricated antenna ranged from 5.4 dBi to 6 dBi within an axial ratio bandwidth of 3 dB.     

宽带高增益圆极化天线

设计了一种宽带高增益圆极化天线。天线采用双同轴线激励以及威尔金森功分器和90°相位比较器的馈电网络形式实现了天线的宽带圆极化特性。该馈电网络形式能在较宽的频带范围内保持稳定的幅度和相位。通过在蝶形天线外围引入方形环,增加了天线的有效辐射面积,从而显著提高了天线的增益。测试结果显示,该圆极化天线VSWR<1.5的阻抗带宽达到63.6%,3 dB轴比带宽达到66.7%,且在1.1~1.6 GHz频段范围内,右旋圆极化增益＞9.4 dB。     

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.     

一种新式宽带笼形单极天线

为展宽传统单极天线的带宽,通过仿真优化设计,详细研究了一种新颖笼形单极天线的阻抗特性和辐射特性,以及各种参数对天线电性能的影响,最终利用优化结果研制了一种结构紧凑的宽带笼形单极天线。实验证明,该天线具有良好的带宽特性、良好的全向辐射特性、体积小、重量轻等诸多优点,测试结果和仿真结果取得了较好的一致。该天线具有良好的应用前景,可广泛用于机载、弹载、空闻载和地面终端等场合。     

Design Considerations on the Minimum Size of Broadband Antennas for UWB Applications

The practical realization of Chu's minimum-sized antenna is investigated using self-complementary antennas. Rigorous bandwidth formulas for broadband antennas are derived for broadband antennas based on Chu's fundamental mode equivalent circuit. By comparing input impedances and radiation patterns, the fabricated self-complementary antenna used for Japan's ultra-wideband higher band (7.25-10.25 GHz) is found approximated by the minimum-sized antenna. Using the rigorous bandwidth formulas above, the fabricated antenna is shown to be smaller than the minimum-sized antenna. This breakthrough is achieved by using a more complicated matching circuit for broadband antennas instead of the single-stage inductor used in bandwidth estimation with the Q factor.     

Compact wound-type slot antenna with wide bandwidth

A new type of a slot antenna in which a slot is formed in wound-type around a dielectric substrate is proposed. In comparison with a conventional meander slot antenna, the proposed antenna has a wider bandwidth and smaller size. The proposed antenna has been designed on a gallium arsenide (GaAs) substrate and fabricated by integrated circuit process for the integration of the antenna with active components. The fabricated antenna has dimensions of 6.2 /spl times/4.1 mm/sup 2/ and a 10-dB bandwidth of 300 MHz at 5.8 GHz.     

一种超宽带地板开槽单极子天线的设计

研制了一款超宽带印刷单极子天线。通过在接地板和单极子贴片底部开槽,展宽了天线频带,改善了天线带内特性,提高了天线增益。采用HFSS软件进行仿真,对天线模型参数进行优化,达到最佳设计效果。结果表明,改进后的天线-10 dB阻抗带宽为2.2~14.6 GHz,比原不开槽天线的-10 dB阻抗带宽增加了7.2 GHz。天线实现了小型化超宽带的同时,在整个超宽带匹配频段内,具有良好的驻波和方向图特性,在超宽带设备中有着很好的应用前景。