一种新型圆极化贴片天线的研究

研究了圆极化微带贴片天线,通过在普通圆形贴片上开槽,提出了一种结构新颖的圆极化微带贴片天线.仿真以及实测结果表明,该天线具有较宽的3dB波瓣宽度(±50°)和良好的圆极化轴比性能,并且新型微带贴片天线的尺寸要远小于普通的圆形或圆环形贴片天线的尺寸.     

A High Gain and Broadband C-Band Aperture-Coupled Patch Antenna

A aperture-coupled patch antenna is designed with parasitic elements connecting to the rectangle ring on the bottom of antenna substrate through metal vias, which lead the current induced by patch radiator to the top surface of antenna substrate. Therefore, the effective radiation is enhanced and higher gain is achieved. The bandwidth is broadened simultaneously due to the structure of aperture-coupled patch antenna with parasitic elements. Compared to the conventional aperture-coupled patch antenna, the antenna gain increases averagely 2 dB due to the novel structure. Compared to patch antenna of electromagnetic band-gap, the dimensions of novel patch antenna greatly decreases, which can be used as element in the array antenna. Two kinds manufactured antenna are both measured in an anechoic chamber. The good agreements between numerical simulation and experimental prototype have been obtained.     

60-GHz CPW-fed post-supported patch antenna using micromachining technology

A 60-GHz coplanar waveguide (CPW)-fed post-supported patch antenna is presented using micromachining technology. In the proposed structure, the radiating patch and the feed line network can be optimized separately with a substrate. The antenna performance is improved by elevating the patch in the air. A patch array antenna is also designed with a simple feed network. The fabricated antenna shows broad band characteristics such as -10 dB bandwidth of 4.3GHz from 58.7GHz to 64.5GHz in the single patch antenna and 8.7GHz from 56.3GHz to 65GHz in 2/spl times/1 patch array antenna.     

Dual frequency multilayered circular patch antenna withself-diplexing function

A novel type of dual frequency and double-layered patch antenna with self-diplexing function is presented. Experimental results of the proposed antenna which consists of a circular patch antenna and a ring patch antenna with partially shorting planes are shown to verify the practicality of the new antenna configuration     

Broadband semicircle-fed flower-shaped microstrip patch antenna

A new wideband flower-shaped microstrip antenna patch, semicircle-fed, is investigated. The broadband characteristic is achieved by introducing flower petals at the four sides of a rectangular patch. The proposed antenna is able to achieve an impedance bandwidth of 63% for VSWR less than 2. Using the same excitation mechanism, a comparison between the proposed antenna, a similar-size rectangular-shaped patch antenna and a diamond-shaped patch antenna is given.     

宽频化与小型化微带天线的研究与设计

以微带天线技术为基础,以工作于ISM频段微带贴片天线为例,采用Ansoft公司的电磁仿真软件HFSS,对不同介电常数、不同介质板厚度、矩形贴片开槽开缝、加载寄生贴片等微带贴片天线进行了仿真。通过数值分析,阐述了介电常数、基板厚度、贴片开槽、寄生贴片等因素对微带贴片天线尺寸和频带宽度的影响。仿真结果表明,设计能够实现两种性能的天线结果,天线的宽度达到36%。天线的尺寸缩小了34.2%。     

用于天线RCS减缩的分形微带贴片天线

本文给出一种分形微带天线在天线雷达散射截面(RCS)减缩中应用的示例.分形结构具有独特的空间填充性能,利用该性能可以探索分形天线在天线RCS减缩中的应用.设计出的分形天线与常规天线的辐射性能进行了比较,可以看出分形天线基本保持了原辐射性能.同时比较了两者的散射性能,可以看出分形天线有一定的RCS减缩效果.本文的内容对天线隐身有一定的借鉴作用.     

一种微带开槽小型化飞行器天线设计

本文根据曲流原理,采用微带开槽技术,设计了一种基于传统半波微带贴片天线的小型化飞行器天线。对此 天线进行了天线与天线窗一体化仿真优化。该天线在主要性能指标不变情况下,明显减小了微带贴片尺寸。把这一设 计应用于实际微带天线调试过程中,发现了微带天线开槽调试法,实现了飞行器微带天线的双向调试,提供了一种新 的天线工程化设计思路。为飞行器小型化微带天线设计和调试提供理论参考,具有一定的理论价值和较高工程应用价 值。     

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     

Measurement and analysis of miniature multilayer patch antenna

Although the microstrip patch antenna has a number of advantages such as low-cost and light weight, its physical size is quite large at low microwave frequencies. The designs of multilayer miniature patch antennas with coaxial feed are presented. The first design is a rectangular two-layer patch antenna. Measured results and the results of a preliminary analysis are presented. The projection area of the two-layer patch antenna is kept the same as the single-layer rectangular patch antenna. The resonant frequency of the two-layer antenna is reduced by 50% and has bandwidth of 5%, which is wider than the single-layer rectangular patch antenna. In the second design, the upper patch is cut into a bow-tie shape. This results in a 60% reduction in resonant frequency and a 12% bandwidth. Both the two-layer rectangular and the two-layer bow-tie antennas have good radiation patterns, with cross-polarization level lower than the copolarization level by more than 20 dB     

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。     

低温共烧陶瓷工艺制备EBG定向天线

通过低温共烧陶瓷(LTCC)工艺制备出禁带位于超宽带(UWB)范围的电磁波禁带(EBG)天线陶瓷基板,其电磁波禁带位于4.0~5.5 GHz。在基板上制备了片式天线,在微波暗室中对天线方向性进行测试。结果发现,与没有EBG结构的片式天线相比,其在H面主瓣方向上的增益提高了约4 dB,背瓣方向辐射强度平均降低了10 dB左右,证明EBG结构能够有效改善天线在空间辐射的方向性。     

低温共烧陶瓷工艺制备EBG定向天线

通过低温共烧陶瓷( LTCC)工艺制备出禁带位于超宽带(UWB)范围的电磁波禁带(EBG)天线陶瓷基板,其电磁波禁带位于4.0～5.5 GHz.在基板上制备了片式天线,在微波暗室中对天线方向性进行测试.结果发现,与没有EBG结构的片式天线相比,其在H面主瓣方向上的增益提高了约4dB,背瓣方向辐射强度平均降低了10 dB左右,证明EBG结构能够有效改善天线在空间辐射的方向性.     

Stacked patch antenna fed by a coplanar waveguide

A broadband patch antenna fed by a coplanar waveguide (CPW) is presented. The antenna was designed based on the stacked patch technique developed for aperture-coupled patch antennas. It is similar in configuration to a conventional stacked patch antenna, but the lower of its two patches is fed with a conductor-backed CPW Both simulation and measurement show that the antenna has bandwidth of over 10% (for |S/sub 11/| /spl les/ -10 dB) centred at 10 GHz.     

Wideband small patch antenna

A small patch antenna fed by a coaxial probe with a wideband characteristic is presented. By employing dual shorting pins and cutting a slot in the patch, the size of the patch antenna is reduced while its impedance bandwidth is enhanced. The resonant frequency can be reduced by /spl sim/75% when compared with the resonance edge of a conventional patch antenna. The antenna has an impedance bandwidth of 21.5% (SWR<=2) and maximum gain of 2.2 dBi.     

短路针加载三角形微带贴片天线的研究

短路针加载微带贴片天线具有较低的谐振频率,特别适用于低频便携式通信设备(如手机)中.与短路针加载矩形和圆形贴片天线相比,短路针加载三角形贴片天线具有更低的谐振频率.本文基于腔模理论,利用未加载三角形贴片天线的静态模,提出了短路针加载三角形贴片天线的理论分析方法,给出了天线谐振频率、输入阻抗及反射损耗的计算公式.数值计算与实测结果相吻合,表明这种分析方法是有效的.     

人体中心网络微带缝隙天线设计和研究

设计了一款小型微带缝隙天线.通过电磁仿真软件CST的参数优化功能,对微带缝隙天线缝隙的长度、宽度、馈电点等参数进行优化,得到了工作频率为2.45GHz,带宽100 MHz、阻抗匹配良好、辐射效率较高的用于人体中心网络的微带缝隙小型天线,根据仿真设计,制作了天线,测试结果和仿真结果吻合较好.     

Center-fed microstrip patch antenna

A novel feeding scheme for microstrip patch antennas is presented, which consists of a coaxial probe and shorting pin separated by a narrow slot centrally cut at the radiating patch. The impedance and radiation characteristics of a conventional probe-fed microstrip patch antenna and the proposed microstrip patch antenna are experimentally examined and compared. The effects of the slot length on the antenna operation are also discussed.     

Dual band rectangular patch antenna array with defected ground structure for ITS application

A dual band inset fed rectangular patch antenna array has been proposed for intelligent transportation system (ITS) application. This paper proposes 8–element patch array antenna with defected ground structure (DGS). The simulated results of 2, 4 and 8 element patch with and without DGS are also compared. Proposed antenna gets dual band of 5.02 GHz and 5.92 GHz centre frequency with DGS. The 8–element patch array antenna with DGS is fabricated and its result is compared with simulation result. 26.5 dBi and 24.9 dBi is measured gain of the proposed antenna structure for 5.02 GHz and 5.92 GHz centre frequency respectively.