共查询到20条相似文献,搜索用时 18 毫秒
1.
In this paper, a novel single feed frequency and polarization reconfigurable microstrip patch antenna is presented. This antenna mainly comprises of a corner truncated square patch with a rectangular ring slot, eight PIN diodes and six conductive pads. Four PIN diodes are placed symmetrically in the rectangular ring slot to bridge the gap and to switch the frequency between WLAN bands resonating at 5.2G Hz and 5.8G Hz. Four PIN diodes connect the corner truncated square patch to parasitic triangular conductors. PIN diodes are used to switch the polarization between linear, right hand circular and left hand circular at each frequency. When compared to conventional patch, the proposed design provides a size reduction of 12% at 5.2G Hz, and 30% at 5.8G Hz. The simulated reflection coefficient and radiation patterns are presented and compared with the experimental data. This antenna finds applications for modern wireless communication system. 相似文献
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A method to enhance the gain of microstrip dual-band multiple-input multiple-output (MIMO) antenna using partially reflective surface (PRS) layer is introduced and investigated in this paper. The proposed antenna consists of two FR4 substrates. The lower substrate has two radiating patches with parasitic elements that are supplied independently and create the MIMO property of the antenna. The upper substrate which is known as superstrate is arrays of PRS unit cells. The PRS layer printed on either side of a dielectric substrate and causes the antenna gain to increase in both frequency bands. The proposed antenna is appropriate for LTE (2.4–3.1 GHz) and WLAN (5.1–5.8 GHz) applications. The measured values of S11 and S22 parameters of the antenna are less than −10 dB and its FBR and gain are 12.5 dB and 5dBi, respectively. The average half power beam-width (HPBW) is roughly 108○. 相似文献
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In this paper, a polarization and frequency reconfigurable antenna with double layer metasurface, responsible for frequency and polarization reconfiguration respectively, is proposed. This antenna could operate in linear polarization in 4 GHz and circular polarization in 5 GHz band. By rotating the frequency reconfiguration metasurface, the linear polarization (LP) operating frequency can be continuously changed from 4 GHz to 4.35 GHz (8.4%) with circular polarization operating frequency around 5 GHz unchanged. Moreover, polarization of the whole antenna at 5 GHz can be reconfigured to linear polarization (LP), right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) by rotating polarization reconfiguration metasurface, the 3 dB axial ratio bandwidth is 5.0–5.2 GHz (4%). In all states, gain of the antenna achieves 5 dBi. 相似文献
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BelhachatMessaouda BakirMohammed ZhuShouzheng LiuJingao 《电子科学学刊(英文版)》2004,21(5):421-425
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. 相似文献
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一种双频左/右旋圆极化可重构环形缝隙微带天线 总被引:3,自引:3,他引:0
设计了一种频率比为1.9的双频左/右旋圆极化可重构环形缝隙微带天线,其在高频段和低频段分别工作于线极化和圆极化状态。在该天线中,环形缝隙和相互正交的四个缝隙臂将接地面分为五部分,缝隙臂上跨接两对PIN二极管开关和隔直电容。通过二极管开关的控制,天线在低频频率上可实现左/右旋圆极化的切换,在高频频率上则可保持其线极化性能不变。实验结果表明,天线在1.6 GHz的低频段上具有12.5%的3 dB轴比带宽,在3.06 GHz的高频段上其–10 dB阻抗绝对带宽为100 MHz,成线极化状态,辐射方向图近似不变。 相似文献
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This article introduces a novel and groundbreaking approach combining multiple-input-multiple-output (MIMO) technology with radio frequency (RF) energy harvesting. The proposed antenna consists of two semi-circular monopole antenna components, optimized with dimensions of 89 × 51.02 × 1.6 mm3, that share a common ground plane to achieve MIMO characteristics. A series of split-ring resonators on the ground plane significantly enhances the isolation between the two radiating components. Band-notched features are performed in the 3.5 GHz WiMAX and 5.5 GHz WLAN bands through modified C-shaped slots in the radiating patch and two rectangular split-ring resonators serving as parasitic devices near the feed line. The reconfiguration of band-notching is made possible by controlling the modes of the embedded PIN diodes. The two antenna elements maintain mutual coupling below −18 dB from 1.5–13 GHz, achieving an impressive 158.62% impedance bandwidth. The antenna's efficiency and gain experience significant drop, indicating effective interference suppression at the center frequencies of the notch bands, and its performance in MIMO systems is assessed through parameters including envelope correlation coefficient, port isolation, radiation patterns, efficiency, gain, and diversity gain. The simulated properties of the designed antenna closely align with the measured outcomes, demonstrating its reliability and consistency. Moreover, the article evaluates the antenna's potential for RF energy harvesting, achieving a maximum harvested energy of 4.88 V. This proposed antenna can be used in multiple applications, like wideband, band-notching MIMO, and RF energy harvesting. This proposed antenna is an efficient, reconfigurable wideband MIMO antenna with novel RF energy harvesting capability. 相似文献
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介绍了一种适用于极化捷变天线的可重构射频网络.该射频网络由一个两路可重构Wilkinson功率分配器和两个45°/135°可重构移相器构成,通过控制PIN二极管的偏置电压,可实现两种单路(1:0和0:1)传输模式和三种两路(1:1,1:j和j:1)传输模式,即五种不同的工作模式切换.实测结果表明:该可重构射频网络在单路传输模式(相对带宽6.7%)下的插入损耗小于1.5 dB,输入端口的回波损耗大于12.1 dB;在两路传输模式(相对带宽4.3%)下的输出端口间隔离度大于23.6 dB,相位差为3.5~5.4°(1:1模式)和92.6~97.4°(1:j和j:1模式),相位误差小于7.4°. 相似文献
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R.V.S. Ram Krishna Raj Kumar Nagendra Kushwaha 《AEUE-International Journal of Electronics and Communications》2014,68(11):1119-1128
A coplanar waveguide fed slot antenna for wideband circular polarization is designed and experimentally validated. The rectangular slot is excited using a stepped feed line terminated on a circular disc shaped tuning stub. To obtain circular polarization, inverted L-shaped strips are attached to the ground plane at the opposite corners while a rectangular slit is cut in the circular disc. The combined bandwidth (3-dB axial ratio and 10 dB impedance matching) achieved is 48% (4.35–7.1 GHz) under simulation and 40% (4.75–7.1 GHz) in measurement. The gain of the antenna is next enhanced by the application of a double layered square loop frequency selective surface. The frequency selective surface is used as a reflector placed beneath the antenna at an optimum distance. An improvement of about 4 dB is seen in the measured peak gain over most of the operating band. Experimental results are presented to characterize the antenna and the frequency selective surface and they are found to be in good agreement with the simulated results. 相似文献
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左/右旋圆极化可重构微带天线 总被引:2,自引:0,他引:2
设计了一种左/右旋圆极化可重构的微带天线。在矩形微带贴片的两条边上增加枝节,贴片与枝节通过PIN 二极管开关连接,通过控制PIN 二极管的通断来改变正交模式的相位差,使天线在同一个馈电点上可实现左旋圆极化(LHCP)和右旋圆极化(RHCP)的重构。该天线在(2800±10)MHz 的频率范围内驻波比小于2,轴比小于3dB。仿真结果与测试结果均验证了该方案的可行性。 相似文献
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提出了一种适用于WLAN/WiMAX的小型化双频微带天线。在矩形辐射贴片表面加载2/5形缝隙,改变矩形辐射贴片表面电流路径,使电流有效路径增加,实现天线的双频特性。通过电磁仿真软件HFSS 15.0对天线模型进行仿真分析。结果表明,天线可同时工作于WiMAX2.60 GHz和WLAN5.15 GHz频段,低频段和高频段的相对带宽分别为4%(2.53~2.64 GHz)和6%(5.14~5.48 GHz),最大增益分别为4.47 dB和1.35 dB,能够满足WLAN和Wi MAX的通信需求。天线整体辐射性能良好、结构简单、容易集成于前端电路。 相似文献
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Won‐Sang Yoon Sang‐Min Han Seongmin Pyo Jaehoon Lee In‐Chul Shin Young‐Sik Kim 《ETRI Journal》2010,32(3):468-471
A compact square patch antenna with reconfigurable circular polarization (CP) at 2.4 GHz is proposed. Circular polarization is generated by an arc‐shaped slot on the ground plane. In order to switch the CP orientation, the current flow direction of the patch is reconfigured via the PIN diodes mounted on the slot. As the slot and bias circuit are not placed on the patch side, the proposed antenna radiates a CP wave without alteration in the main beam direction. From the experimental results, the impedance and CP bandwidths of the proposed antenna have been demonstrated for up to 80 MHz and 25 MHz, respectively. 相似文献
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双极化方形微带天线的阻抗特性 总被引:1,自引:2,他引:1
在方形微带贴片的相邻两边电可以辐射双极化波。文中结合平面电路技术,腔模理论,用Green函数法导出了双边馈电方形微带天线输入阻抗与互阻抗的计算公式,分析了X波段双极化方形贴片天线输入阻抗,S参数和电压驻波比在谐振频率附近的变化情况,以及馈电点位置与宽度和εr对这些特性参数的影响。文中的计算方法可靠而简捷,可用于此类天线的设计,这种天线容易形成阵列结构,并易于有源集成。 相似文献
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This article presents a small, low-profile planar microstrip antenna that is applicable for both WLAN and WiMAX applications. The goal of this paper is to design an antenna which can excite triple-band operation with appreciable impedance bandwidth to combine WLAN/WiMAX communication specifications simultaneously in one device. The designed antenna has a compact size of 10 × 26 mm2. The proposed antenna consists of an inverted U-shaped slot radiator and a defected ground plane. Overall the design method and parametric study found appropriate dimensions, which provides three distinct bands I from 2.40 to 2.52, II from 3.40 to 3.60 and III from 5.00 to 6.00 GHz that covers entire WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.5/3.5/5.5) bands. Finally, a prototype antenna was fabricated and experimentally characterized to verify the design concept as well as to validate the simulation results. Thus the simulation results along with the measurements show that the antenna can simultaneously operate over WLAN and WiMAX frequency bands. 相似文献
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A compact frequency
notched microstrip slot antenna for ultra-wideband (UWB) /2.4 GHz-band wireless local area
network (WLAN) applications is proposed. The antenna is similar to a conventional
microstrip slot antenna; however, by introducing a cross wide slot and a meandered-slotted
stub, both compact size and frequency notched function can be achieved. It has been
studied both numerically and experi- mentally for its impedance bandwidth, surface current
distribution, radiation patterns, and gain. As will be seen, an operation bandwidth of
over 4.61 ranging from 2.39 to 11.25 GHz for return loss lower than having a frequency
notched band ranging from 4.75 to 5.85 GHz has been achieved, and good radiation
performance over the entire frequency range has also been achieved. 相似文献