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.     

边缘馈电圆极化椭圆贴片天线的设计

设计了一种圆极化(LCP)、采用边缘馈电的椭圆贴片天线。该天线采用单点馈电方式实现圆极化,无需外加相移网络和功率分配器,结构简单,成本低,适合小型化。对所设计的天线采用CST软件进行了仿真,从方向图、S参数值、轴比等方面进行分析,仿真结果验证了设计具有合理性,天线性能达到了设计要求。     

一种中心馈电圆极化天线设计

针对两维大角度扫描圆极化天线阵面的使用需求,设计了一种中心馈电的圆极化微带贴片天线单元,采用2×2的单元顺序旋转90°的方式解决了微带贴片天线轴比参数敏感的问题,单层微带贴片天线的选用,大大降低了有源相控阵天线的制作成本.采用HFSS对天线单元以及2×2旋转阵列进行电性能仿真,并根据工程使用要求进行样件加工,实测结果显...     

微带贴片天线的分析方法

文章首先简要介绍了微带贴片天线的馈电方式,然后给出了微带贴片天线的三种常用数值分析方法,并用基于上述分析方法的两种仿真软件对一种倒F天线进行了仿真,从仿真的S11参数和方向图可知,天线具有较好的性能,这两种仿真软件的结果是基本相同的。     

一种旋转馈电的圆极化微带阵列天线设计

为展宽微带天线的轴比带宽并提高增益,利用旋转馈电方法设计出一种小型化宽轴比高增益的圆极化微带阵列天线。天线由四个微带贴片单元和一个旋转馈电网络组成,每个贴片单元为引入半圆槽的切角矩形,且关于中心旋转对称;旋转馈电网络位于底层介质基板的表面,与四个贴片单元通过四个镀铜通孔相连。利用电磁仿真软件HFSS对天线的性能进行数值计算,阵列天线的-10 dB阻抗带宽为12.3%(4.71～5.33 GHz),3 dB轴比带宽为13.2%(4.67～5.33 GHz),峰值增益在5.2 GHz为9.02 dB。     

一种2.4GHz圆极化微带贴片天线的设计与实现

本文简要介绍了微带贴片天线的工作原理及圆极化技术,针对谐波探测雷达的使用需求,研究设计了中心频率为2.4GHz的圆极化微带贴片天线。天线采用方形贴片切角的单馈电法实现圆极化,结构简单、成本低、尺寸小。文中详细介绍了天线设计方案和数值仿真结果,并制作了天线实物测试验证其阻抗、方向图、增益等性能。     

宽带宽角圆极化微带贴片天线设计

提出一种新的宽带宽角圆极化微带天线设计方法 ,在利用 L探针进行近耦合馈电的基础上 ,通过薄介质基片加载 ,使贴片天线的阻抗带宽 ( VSWR≤ 2 )和宽角轴比带宽 ( 4 5°圆锥空域内 AR≤ 3d B)达到 2 0 %以上 ,同时保持了微带天线的固有优点 :剖面低 (厚度小于 0 .1中心频率波长 )。利用该方法设计的试验天线的带宽达到2 1 % ,从而证实了该方法的正确性和实用性     

单频圆形微带贴片天线设计

基于微带贴片天线在无线引信中的应用,设计了一种中心频率为7.2 GHz的同轴馈电圆形微带天线,该天线介质基片相对介电常数为εr=4.4,回波损耗小于-20 d B,天线增益大于5 d B。根据微带天线原理,通过HFSS软件设计的天线,实验结果表明:天线谐振频率、回波损耗等性能参数符合设计要求。     

一种新型C波段宽带圆极化贴片天线的设计

采用电磁仿真计算软件HFSS设计并仿真了一种工作于C波段宽带圆极化微带贴片天线。天线采用双馈点对圆形微带贴片进行馈电,实现圆极化;选用两层聚四氟乙烯玻璃纤维板作为介质,通过底层馈电网络由探针穿过中间地板层对上层圆形贴片进行馈电,在探针周围用环形槽将探针与地板进行隔离,并增加了天线的谐振点,从而进一步扩展了天线频带。结果表明天线的相对带宽约为30％,并且E面、H面3dB轴比角度均大于90°。     

一种宽频带微带贴片天线的实验研究

针对微带贴片天线频带较窄的缺点,本文提出了一种能使频带显著加宽的微带贴片天线的新结构,实验研究表明,采用这种结构所设计的微带贴片天线,其阻抗带宽达到64.1%(VSWR≤2),同时这种结构还可用于多层微带贴片天线.     

Circularly polarized single-fed wide-band microstrip patch

For more than 25 years, the circularly polarized single-fed microstrip patch was considered to be extremely narrow-band. The reported performances are almost exclusively related to single patches printed on a dielectric substrate, which partially explains the frequency characteristics. The antenna proposed is a variation of the "almost square" patch and exhibits measured axial radio of less than 2.5 dB over a 13% bandwidth. The antenna was designed for wireless applications.     

Circularly polarized microstrip antenna with a single feed

A novel circularly polarized (CP) microstrip antenna with a single coaxial feed is introduced. The antenna consists of two layers, each radiating fields which at the zenith are perpendicular to each other with 90° phase difference. The CP bandwidth is substantially higher than that of the previously reported CP microstrip antennas with two nearly degenerate modes. In principle, a perfect CP radiation is feasible without the input impedance mismatch. The CP design procedure is independent of the feed location     

A compact circularly polarized subdivided microstrip patch antenna

A compact circularly polarized subdivided microstrip patch antenna is proposed. The antenna is composed of the interconnection of four corner patches alternating with four strips and a fifth central patch. It presents the very small size of 0.28λ_g by 0.28λ_g at resonance (5.85 GHz), which represents a surface reduction of 60% compared with a conventional microstrip square patch antenna. The proposed antenna exhibits a gain of 4.3 dBi to 5 dBi and an axial ratio lower than 1.8 dB in the range of its bandwidth, which is of 30 MHz     

宽带高增益圆极化微带天线与阵列

设计了一副宽带高增益圆极化微带天线,并进行组阵分析。天线中心频率2.6 GHz,通过增加寄生贴片和空气层来提高天线单元的增益和带宽。上下两层介质板上边长不同的切角方形贴片分别激励一个低频与高频的圆极化模,有效地拓宽了轴比带宽。仿真结果表明,反射系数|S11|<-10 dB带宽21.8%,3 dB轴比带宽12.0%,中心频率点增益9.0 dBi。对天线单元进行加工测试,与仿真结果较为吻合。设计了2×4元阵列,并进行了仿真,增益提升至17.5 dBi,3 dB轴比带宽10.4%。     

用于高功率微波测量的圆极化微带阵列天线

在进行高功率微波(HPM)辐射场测量时,测量天线的极化匹配对测量精度影响较大。为提高测量精度,介绍一种微带圆极化阵列天线,采用功分器作为馈电网络,获得了小于1 d B的轴比,与非阵列圆极化微带天线相比,使轴比降低约1 d B。因此,当采用该圆极化阵列天线测量线极化微波的远场辐射时,使极化失配对测量结果的影响由±13%降至±3.6%左右。     

Reconfigurable dual-band circularly polarized microstrip patch antenna for wireless applications

A new design of reconfigurable single-feed circular patch microstrip antenna for dual-band circular polarization application is proposed. The dual-band functionality is realized through incorporating cross-slots of equal slot length in the circular patch and utilizing two PIN diodes to switch the slots on or off. A pairs of tuning stubs are used to tune the circular polarization performance. The design process is presented and good results were obtained.     

Circularly polarized metallic EBG antenna

This letter describes the concept and the realization of a directive and circularly polarized antenna using an electromagnetic band gap material whose circular polarization is generated by the structure itself. Experimental and simulated results are presented for an antenna operating at 5GHz.     

Circularly polarized twisted loop antenna

A novel wire-loop antenna is introduced for circular polarization. By introducing a small gap at the middle of two nonradiating sides of a one-wavelength square wire loop, a 90/spl deg/ time-phase difference between the currents on the other two radiating sides can be achieved. Then by twisting the square loop to make the radiating sides orthogonal the necessary conditions are satisfied for circularly polarized radiation. The antenna yields nearly ideally circular polarization at broadside as well as excellent input impedance properties near the design frequency. The radiation pattern has a broad beamwidth and good rotational symmetry about the axis. For a demonstrator operating at 1 GHz, a 3-dB axial ratio was maintained over /spl plusmn/30/spl deg/. The mechanism of circular polarization is analyzed based on numerical simulation. Experimental results are presented to verify the theoretical predictions made.     

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.     

Small microstrip patch antenna

A novel small microstrip patch antenna is presented. The probe-fed circular microstrip patch incorporates a single shorting post which significantly reduces the overall size of the antenna. Experimental and theoretical impedance behaviour and radiation characteristics of the modified patch are given. Very good agreement between experiment and theory was achieved