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1.
微带天线圆极化技术概述与发展   总被引:1,自引:0,他引:1  
圆极化微带天线在无线应用中扮演着重要角色。本文论述微带天线圆极化技术,简要概括微带天线圆极化方法,接着重点分极当前出现的多种新型圆极化微带天线及进展,最后讨论了发展趋势。圆极化微带天线将不断推阵出新,以满足愈加广泛的应用需求。  相似文献   

2.
本文设计并研制了2GHz敷铜板圆极化微带天线及4.5GHz高温超导(HTS)圆极化微带天线.2GHz敷铜板圆极化微带天线的半功率角为63°,最好轴比为1.2dB;4.5GHz的HTS圆极化微带天线相对于银天线有3dB的增益改善,其半功率角大于63°.  相似文献   

3.
刘伟 《中国新通信》2013,(21):113-113
本文通过圆极化微带天线设计的主要方法,以及对5.6GHZ圆极化微带天线的设计研究,找出确定馈电点的合理方法,并进行仿真分析。  相似文献   

4.
宽带圆极化微带天线的几种实现方法   总被引:1,自引:2,他引:1  
在简要概述圆极化微带天线工作原理的基础上,重点介绍了目前国内外较为先进的圆极化微带天线实现宽带的多种方法,包括微带贴片天线、缝隙天线,以及采用PBG结构的圆极化天线。这些方法分别采用单点馈电,多点馈电或多元组合实现圆极化,均有效拓展了圆极化天线的阻抗匹配带宽和圆极化轴比带宽。参考一些实例验证了这些方法的可行性,然后展望了其可能的发展趋势。  相似文献   

5.
利用经验公式和软件仿真相结合的方法设计UHF波段的圆极化双层微带天线。对双层微带天线的圆极化特性进行分析研究,得到比较好的轴比、增益和方向图。  相似文献   

6.
本文在一般方形切角微带天线研究的基础上,提出了一种改进的辐射贴片的微带天线,采用在切角贴片的一侧加入一个调谐枝节的结构,以进一步改善阻抗特性,实现宽带辐射同时实现了圆极化.文中设计了一个工作于Ku波段的宽频带圆极化微带天线单元,仿真测试指标满足设计要求.  相似文献   

7.
圆极化(CP)巳在各种微带天线的有关文章上报导过。参考文献[3]中最近介绍了一种圆极化天线的实验结果,该天线是由在圆形和正方形微带天线内部开槽或切角发展而来的。本文介绍的理论对所有这些天线都适用,它阐明了工作机理并提供了一种预测圆极化工  相似文献   

8.
就圆环缝隙结构的圆极化天线进行理论分析,提出在微带天线接地板上添加十字形槽以拓展天线带宽的方法,并设计出左旋圆极化可重构微带天线.对比仿真结果,添加十字形槽的圆极化天线的阻杭带宽为4.45到5.50 GHz.在4.75到5.45GHz范围内这种方法能在不显著增加天线体积的情况下,将天线带宽增加一倍。  相似文献   

9.
赵一飞  杨阳  杨洪亮  赵益民 《电子科技》2014,27(3):91-94,98
设计了一种GPS小型圆极化微带方形贴片天线。通过表面开槽的方法来减小天线尺寸和提高天线的整体性能,达到小型化的目的。通过切角的方法实现天线圆极化的工作方式。利用HFSS仿真软件对天线的各项参数做了具体的优化分析,给出了各个参量变化对天线性能的具体影响,对以后进一步研究双频或多频圆极化天线具有一定的参考意义。设计的GPS微带天线比同频下圆极化微带天线尺寸减小了20%,S11参数在中心频率1.575 GHz处为-17 dB,频带宽度和轴比都有所提高,满足GPS的应用要求。  相似文献   

10.
本文就圆环缝隙结构的圆极化天线进行理论分析,提出在微带天线接地板上添加十字形槽以拓展天线带宽的方法,并设计出左旋圆极化可重构微带天线.对比仿真结果,添加十字形槽的圆极化天线的阻杭带宽为4.45到5.50 GHz.在4.75到5.45 GHz范围内这种方法能在不显著增加天线体积的情况下,将天线带宽增加一倍。  相似文献   

11.
Circular polarization (CP) design of microstrip antennas and dielectric resonator (DR) antennas through a cross slot of unequal slot lengths in the ground plane of a microstrip line is demonstrated. The proposed CP design is achieved by choosing a suitable size of the coupling cross slot, which results in the excitation of two near-degenerate orthogonal modes of near-equal amplitudes and 90° phase difference. This CP design can be applied to both configurations of microstrip antennas and DR antennas and has the advantages of easy fine-tuning and less sensitivity to the manufacturing tolerances, as compared to their respective conventional single-feed CP designs. For the proposed design applied to a low-profile circular disk DR antenna of very high permittivity studied here, a large CP bandwidth, determined from 3-dB axial ratio, as high as 3.91% is also obtained. Details of the proposed antenna designs are described, and experimental results of the CP performance are presented and discussed  相似文献   

12.
Novel designs of single-feed equilateral-triangular microstrip antennas for circular polarization (CP) are proposed and studied experimentally. It is demonstrated that by embedding a narrow slot or a cross slot of unequal slot lengths in the triangular patch, circularly polarized radiation of microstrip antennas can easily be achieved using a single probe feed. Furthermore, results show that for the design with a cross slot, the proposed antenna can perform CP radiation with a reduced antenna size at a given frequency (denoted as compact CP operation here); that is, the required antenna size is smaller for the proposed antenna for performing CP radiation as compared to a conventional circularly polarized triangular microstrip antenna at a fixed operating frequency. Details of the proposed CP designs are described, and typical experimental results are presented and discussed  相似文献   

13.
Novel circular polarization (CP) designs of single-feed equilateral-triangular microstrip antennas are proposed and experimentally studied. The proposed CP designs can easily be achieved by loading a narrow tuning stub at the triangle tip or at the center of the bottom edge of the triangular patch. Moreover, by embedding a cross-slot of equal slot lengths in the triangular patch, a compact CP operation can easily be obtained, with an antenna size reduction up to about 22%, as compared to the CP design of a regular triangular microstrip antenna without cross-slot at a fixed frequency  相似文献   

14.
15.
Sung  Y.J. Kim  Y.-S. 《Electronics letters》2004,40(9):520-522
A novel design of microstrip patch antennas for circular polarisation (CP) is proposed. As an example, two CP patch antennas are investigated: a broadband CP patch antenna and a dual-band CP patch antenna. The proposed structure can be achieved by embedding circular holes in the microstrip circular resonator. By changing the size and position of loaded holes, two orthogonal modes are simultaneously excited with equal amplitude and /spl plusmn/90/spl deg/ out of phase. Without any 90/spl deg/ phase-shifter, the proposed CP patch antennas are excited by single feed.  相似文献   

16.
Dual-band circularly-polarized square microstrip antenna   总被引:3,自引:0,他引:3  
New designs of obtaining dual-band circular polarization (CP) radiation of a single-feed square microstrip antenna are proposed and experimentally studied. The proposed single-feed dual-band CP designs are achieved by inserting four T-shaped slits at the patch edges or four Y-shaped slits at the patch corners of a square microstrip antenna. From experiments conducted, a patch size reduction as large as 36% for the proposed design, compared to a conventional CP design without the inserted slits, has been obtained. Details of the design considerations of the proposed antennas are described, and experimental results of the obtained dual-band CP performances are presented and discussed  相似文献   

17.
The design of an aperture-coupled annular-ring microstrip antenna for circular polarization (CP) is presented. The CP radiation of the annular-ring microstrip antenna is achieved by a series microstrip-line-feed configuration through the coupling of a ring slot in the ground plane. The key parameters of the proposed design are investigated using a commercial simulation software based on the Method of Moments to show how to obtain the 50 /spl Omega/ input impedance and optimum axial ratio. The proposed design can be applied to the annular-ring microstrip antennas with different inner radii and substrate thickness, and several antenna prototypes are constructed and measured. Details of the experimental results of the CP performance are presented and discussed.  相似文献   

18.
A new simple single-feed method for circularly polarized ring antennas has been investigated. Experimental and theoretical investigation show that either right-handed (RH) or left-handed (LP) circular polarization (CP) can be easily achieved by selecting one of the two input ports of the antennas. The proposed U-shaped microstrip feed line excites the fundamental ${rm TM}_{11}$ mode of the ring radiating elements through proximity coupling along the semi-annular section of the line. The induced rotating surface currents on the ring radiators contribute to the circular polarization behavior of the antennas. Two types of rings have been investigated. Square ring prototypes operate at 2.7 GHz have been designed, fabricated and evaluated to show the basic operating principles of the antennas, while annular ring radiating elements operate at 2.255 GHz are realized to demonstrate the reconfigurable capability of the new feeding structure. In the reconfigurable design, a high isolation RF switch is used to direct the input signal between the two input ports. With suitable biasing arrangement of the RF switch, the antenna is capable to radiate at either types of circular polarization. The reconfigurable design is fed by a single microstrip line. Return losses, axial ratios, gains and radiation patterns of the prototype antennas have been measured for verifications. A parametric study of the new feeding structures with a square ring has been carried out for important design guidelines.   相似文献   

19.
The inherent disadvantage of the narrow bandwidth of microstrip antennas is overcome by a wideband feed mechanism. A square patch excited by a stepped T-feed probe achieved an octave bandwidth (0.98 to 2.1 GHz) with a voltage standing wave ratio of <2. A similar return loss over an octave bandwidth (1.05 to 2.4 GHz) was measured when two orthogonal stepped T-feed probes fed by a log-periodic balun were used to generate circular polarization (CP). For CP, pattern symmetry is shown to occur over 50% of the band, and the CP 3 dB axial-ratio bandwidth is of the order of 30%  相似文献   

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