共查询到19条相似文献，搜索用时 156 毫秒
1.
仿真了用于构建人体中心无线网络的蓝牙通信系统平面倒F天线.依据天线理论和人体中心无线网络的特定需求,选择工作于蓝牙频段的平面倒F天线为仿真对象.通过对电磁场EDA仿真软件的整体了解,选择美国REMCOM公司的全波三维电磁仿真软件XFDTD作为仿真平台.仿真结果为,在2.45 GHz的中心频率下,电压驻波比1.31,输入阻抗50.4-j13.3Ω,频带宽度130 MHz,相对带宽5.3%,天线系统效率79.94%.该性能优良的窄带天线,可满足人体中心无线网络的通信需求. 相似文献
2.
(748)×形…像某种形状的。(用于具体事物)如,T形梁,O形腿,A形架,L形天线,X形腿,C形夹,Y形管,D形盒,M形屋顶,H形梁,V形槽,Z形弯道,"人"字形方阵,"之"字形路,π形天线,倒U形曲线等。 相似文献
3.
为了适应卫星通信系统终端的需求,设计了一种三频段天线,辐射贴片的基本形状为四周圆角的矩形,在贴片上分别开T形槽和L形槽,使天线产生3个工作频点。通过对辐射贴片的电流分布和槽形结构进行分析,发现开槽可使电流路径增加,在所需的频段范围内能有效降低回波损耗;同时发现,减小天线的接地面宽度,可减小天线尺寸,从而提高天线的辐射效率。实测结果表明该天线能满足设计要求。 相似文献
4.
设计了一种多分支平面印刷天线,采用微带线馈电方式,其中微带线设计成T形,与辐射单元匹配.辐射单元由3个L形的金属面结构构成,其分别工作在2.4 GHz、3.5 GHz和5.4 GHz,可应用于无线局域网（WLAN）和全球微波互联接（WiMAX）系统.通过电磁仿真软件HFSS对这种天线进行设计,在WLAN应用频段上10 dB阻抗带宽分别为1 GHz （4.9～5.9 GHz）和310 MHz （2.24～2.55 GHz）;在WiMAX应用频段上10 dB阻抗带宽380 MHz （3.3～3.68 GHz）.实测结果表明,这种天线具有良好的远场辐射特性,其增益在2.5～4.7 dBi之间. 相似文献
5.
温煜东 《晋城职业技术学院学报》2013,(6):59-61
本文设计了一种应用于无线局域网的电磁带隙结构(EBG)的微带天线。通过在微带贴片天线的辐射单元周围加载蘑菇型EBG结构,使得天线的带宽、增益性能得到了显著改善。仿真结果表明,与普通贴片天线相比,加载EBG结构时天线带宽增加了6%,主辐射方向上增益增大了1.98dB。 相似文献
6.
温煜东 《晋城职业技术学院学报》2014,(3):56-57,68
主要针对一种弯曲迂回缝隙封装天线的近场特性进行研究。集成的缝隙天线在封装腔中的辐射电场分布可以通过HFSS仿真得到。采用在封装内设置均匀孔栅的方法,抑制这种辐射电场。在设置孔栅结构以后,不仅减小了集成天线对腔内器件的电磁干扰,而且提高了天线的辐射效率。仿真结果表明,弯曲缝隙天线有很好的性能,封装腔内的电场强度下降了10 dB,同时使得天线的增益增加了1.5 dB。 相似文献
7.
介绍天线调谐器反Г形阻抗匹配网络的结构形式和匹配区域;分析反Г形网络各参数取不同值时对HF双极天线的适配性,给出参数变化随频率、VSWR门限变化时对HF双极天线输入阻抗的适配曲线,为设计天线调谐器阻抗匹配网络和决定天线调谐器适配天线类型提供参考． 相似文献
8.
在圆柱形介质谐振器天线单元分析的基础上,设计了一种4单元介质谐振器天线阵列。天线阵采用微带线馈电网络,保证单元之间满足相位匹配关系,使该天线阵列具有良好的定向辐射特性,而且在带宽方面满足要求。 相似文献
9.
通过理论推演给出了细直线型天线电磁辐射场的解析表达式,并给出了该天线辐射场的辐射平均角分布的解析表达式,对此结果数值模拟发现部分电动力学教材中所给的辐射平均角分布示意图有错误. 相似文献
10.
《实验室研究与探索》2020,(2):64-67
设计了一款基于超材料的双陷波小型化超宽带天线。在半圆形单极子超宽带天线基础上,通过在辐射单元引入超材料结构来改善超宽带天线的性能,实现了小型化和双陷波特点。研究表明,小型化超宽带天线在加入超材料结构后,天线尺寸减小了19%,并在4. 2、6. 1 GHz处达到了双陷波功能,该天线在超宽带通信系统中有潜在的应用价值。 相似文献
11.
A wideband cavity-backed slot antenna operated in the ultra-high frequency(UHF)band is introduced.The antenna has a compact structure and low profile with the size ratio of the ground plane to the slot only 1.6:1.The measured impedance bandwidth of VSWR≤3 achieves 85.3%,covering a frequency range from 390 MHz to 970 MHz.The measured gain is about 5.5～7.5 dB. 相似文献
12.
王瑞 《西安文理学院学报》2014,(3):55-57
提出了一种基于圆形缝隙结构的双频超宽带微带天线.通过在圆形缝隙内加载椭圆形贴片使得天线在获得双频超宽带特性的同时又保持了很小的物理尺寸.仿真结果表明,该天线的-10 dB阻抗带宽分别为2.1~4.0 GHz和5.2~8.8 GHz,天线的相对带宽分别达到了62.3%和51.4%,覆盖了无线局域网(WLAN)的2.45 GHz、5.20 GHz和5.80 GHz三个频段以及宽带互通微波接入(WiMAX)的2.50 GHz和5.25 GHz两个频段.在通带范围内,有良好的辐射特性,并且天线的尺寸为35 mm×35 mm×1 mm,便于集成在电路系统中. 相似文献
13.
为了适应全球卫星定位系统的需要,采用多层重叠的贴片结构,设计了一种双频圆极化天线。其中上层贴片为圆形,下层为矩形,利用开槽技术分别在1．618GHz和2．49GHz频段处实现了圆极化,并且通过在下层贴片的四条边上分别开设矩形槽达到了缩小天线尺寸的目的。同时采用单点同轴馈电,实现了良好的阻抗匹配性能。 相似文献
14.
本文在基片集成波导腔体结构的基础上,结合共地共面波导结构,提出了一种低剖面带宽增强型背腔缝隙天线．本天线兼具传统金属波导缝隙天线辐射效率高、功率容量大以及传统微带缝隙天线体积较小的优点,同时还具有了低剖面、重量轻、易于与平面电路集成的特点．仿真结果显示,该天线中心工作频率为5．8GHz,最大增益6．9dBi,相对带宽2．25％,完全覆盖5．8GHz频段,适用于RFID应用． 相似文献
15.
Novel circularly-polarized ceramic dielectric resonator antenna excited by a corner-cut square patch
A ceramic dielectric resonator antenna excited by a corner-cut square patch for the circularly-polarized operation is introduced.
The effect of patch size and cut size is investigated, showing that the resonant frequency of the antenna can be changed by
simply changing the patch size. The reflection, axial ratio, and radiation characteristics of the antenna are found. Measurements
were carried out to verify the design. The antenna is compact in structure, which is attractive in the application as the
satellite communication terminals. 相似文献
16.
This paper proposes a compact polarization microstrip antenna based on double-layer structure.The bandwidth of the whole antenna is widened by expanding the top and bottom layers respectively.After the design of antenna structure and adjustment of size,the proposed antenna can achieve both the left-and right-hand circular polarizations in 2.33 GHz-2.97 GHz.Measurement results indicate that the effective bandwidth is 640 MHz in S-band and the relative bandwidth can achieve 24% with 11 S less than 15 dB. 相似文献
17.
Characteristics of a single-feed dual-frequency bow-tie microstrip antenna are studied. By using the variation method, simple formulas for resonant frequencies of the bow-tie microstrip antenna are derived. It is shown that the dual-frequency ratio can be controlled easily by choosing the parameters of the antenna. This design gives compact antenna size and simple antenna structure. Experimental results are presented, verifying the validity of the design. 相似文献
18.
This paper introduces the advances of ultra-wideband(UWB)and super-wideband(SWB)planar antennas based on the printed monopole,microstrip slot and other planar antenna designs in the last decade.A brief history of the ultra- wideband antennas is first provided.Several types of planar antennas for UWB systems with band-notched designs are reviewed.Special SWB planar antenna designs with the bandwidth ratio greater than 10:1 including metal-plate and printed monopole antennas and tapered slot antennas are presented and compared. 相似文献
19.
A simple and compact ultra wideband (UWB) printed monopole antenna with band-notched performance is proposed in this paper. The antenna is partially grounded so that the Q value is depressed and the impedance bandwidth is broadened. A small strip bar is loaded on each arm of the similar U-shaped radiator. The impedance bandwidth of the antenna overlap with IEEE 802.11a is rejected consequently. The geometry parameters of the antenna are investigated and optimized with HFSS. The measured bandwidth of the proposed antenna occupies about 7.89 GHz covering from 3.05 GHz to 10.94 GHz with expected notched band from 4.96 GHz to 5.98 GHz. A quasi-omnidirectional and quasi-symmetrical radiation pattern in the whole band is also obtained. As a result, a UWB wireless communication system can be simplified with the band-notched UWB antenna presented. 相似文献