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为有效抑制印度国家卫星通信C频段和X卫星频段对超宽带通信系统的干扰,提出了一种新型双陷波超宽带滤波器。该滤波器采用阶梯T型多模谐振器(multimode resonator, MMR)与缺陷地结构(defected ground structure, DGS)的交趾耦合,实现超宽带特性。采用非对称耦合线及在MMR两侧耦合分裂环谐振器的方法,分别在6.67~7.06 GHz, 7.47~7.57 GHz两个频段内产生陷波。实测结果与仿真结果吻合较好,该滤波器的通带范围为3.03~11.50 GHz, 3 dB带宽达到123%,插入损耗仅有0.87 dB,两处陷波中心频率分别在6.87 GHz和7.52 GHz,陷波深度均大于20 dB,且整体尺寸紧凑,仅有16 mm×8 mm大小。 相似文献
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基于Pendry提出的开口谐振环(SRR)基本理论,结合Falcone建立的SRR互补模型,针对Mohammed构建的哑铃型结构,建立了HFSS模型,完整地仿真了哑铃型互补SRR滤波器主要结构参数对性能的影响,分析了滤波器单元边长、缝隙宽度、缝隙间距、开口宽度、桥接间距和桥接宽度与滤波器中心工作频点、工作带宽和传递系数之间的关系.结果表明,通过调整缝隙宽度和间距能够有效改变滤波器工作频点、带宽和传递系数;增加单元边长,虽可有效降低工作波长,但其带宽和传递系数均会显著恶化;其它参数的改变不会导致滤波器性能发生显著改变.最后,设计了实物样品验证了仿真结果. 相似文献
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提出了一种通过加载开口谐振环隔离板来抑制微带天线阵元之间耦合的方法。首先设计了一款工作频率在6GHz的微带天线阵,然后在其阵列单元间加载单环SRR隔离板结构。该结构在特定频段具有带阻特性,可以有效抑制天线单元间的互耦,增加天线单元间的隔离度。最后利用HFSS软件进行了仿真与优化。仿真结果证明:该结构的引入能使微带天线单元间的互耦因子降低10d B左右,体现了较好的互耦抑制特性。 相似文献
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Bharath Reddy Gudibandi Harish Adhithya Murugan Sriram Kumar Dhamodharan 《国际射频与微波计算机辅助工程杂志》2020,30(5)
In this article, miniaturization of the wire monopole antenna with the help of high refractive index (HRI) metamaterial is presented. For the first time, HRI medium is realized by using the array of single ring split ring resonator. By surrounding the wire monopole with the array of SR‐SRRs, the effective wavelength is squeezed in the vicinity of the near field dominance. By the loading of the monopole with such an HRI medium, the size of the antenna is reduced from 29.5 to 16 mm, without any deformation in the current distribution and radiation pattern corresponding to the fundamental resonance. The simulated and measured results are agreed to the same. 相似文献
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Reduction in antenna size by using multi-band radiators play a vital role in the miniaturization of present world wireless handheld devices, as dual band behaviour of the antennas result in the integration of more than one communication standard in a single system and thus, saving the installation space required for separate antennas. In this context, this communication presents a shorted-pin dual band metamaterial inspired microstrip patch antenna array. Under the unloaded conditions, the traditional patch antenna array resonates at 5.8 GHz with gain of 9.8 dBi and bandwidth of 540 MHz. However, when each patch of this traditional antenna array is loaded with split ring resonator (SRR) and a metallic via hole is introduced in the patch, the same antenna array produces an additional resonant frequency in IEEE 802.11b/g/n 2.45 GHz Wi-Fi band with bandwidth and gain of 290 MHz and 5.6 dBi, respectively, while the initial resonant frequency (i.e. 5.8 GHz) gets shifted to IEEE 802.11ac 5 GHz Wi-Fi band, providing the gain and bandwidth of 11.4 dBi and 510 MHz, respectively. The proposed antenna array has been fabricated, and the measured results are presented to validate the proposed array. Moreover, the equivalent circuit of the proposed antenna array has been designed and analyzed to validate the simulated, measured and theoretical results. Attainment of dual band characteristics by incorporating the metamaterial with single band traditional patch antenna array makes this structure novel, as this has been achieved without any extra hardware cost, size and loss of structural planarity. Also, both the frequency bands of this proposed metamaterial inspired antenna array possess considerable gain and bandwidth. 相似文献
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We have introduced metamaterial superstrate in microstrip-based radiating structure to increase its bandwidth. Split ring resonators are added as metamaterial metallic inclusion in superstrate of the conventional design. This changes the basic structure of the material. Material properties such as permittivity and permeability changed due to change in the structure. The change in its material properties enhances the bandwidth of the antenna. The antenna is meandered to achieve better performance at the edges which in a way improve the radiation path of the patch. Here, the proposed antenna works on three bands in the range 3–8?GHz. Maximum 60% bandwidth is enhanced in the third band. The voltage standing wave ratio and return loss (S11) of the entire three bands are shown in the paper. The antenna works on 3.51, 4.86 and 7.8?GHz. Design results are obtained by high-frequency structure simulator which is used for simulating microwave passive components. 相似文献
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Neeththi Aadithiya Balakrishnan Elizabeth Caroline Britto 《International Journal of Communication Systems》2023,36(16):e5586
This research describes the detailed analysis and design of the compact complex-free structural metamaterial quad band radiating element applicable for Bluetooth, WiMAX, WLAN, and fixed-satellite service. The radiating element designed is composed of an inner angle-rotated circular Split Ring Resonator (SRR) placed within the outer square-shaped SRR interlinked by a strip to design the multiband operational characteristics and is fed by a coplanar waveguide. Suggested radiating element is imprinted over the FR4 substrate material with the electrical dimension of 28 × 31.26 × 0.8 mm3. The initial outer-closed square ring offers dual-band operation by resonating at 2.8 and 8.5 GHz frequencies, and the incorporation of a circular SRR offers quad-band operation. The unique negative permeability feature of the proposed Square and Circular Split Ring Resonator (SCSRR) structure is extracted, and its band characteristics are analyzed. Results obtained from the simulated radiating element are validated with the fabricated antenna. The measured E plane pattern resembles a numeric eight shape, and the H plane pattern is omnidirectional. Suggested SCSRR antenna offers a gain of above 3.2 dBi in all the operating bands. 相似文献