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Artykuły w czasopismach na temat „U-shaped resonator”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Li, Ping. "Dual plasmon-Induced transparency in two-dimensional metamaterials with coupled resonators." Materials Express 13, no. 2 (2023): 395–400. http://dx.doi.org/10.1166/mex.2023.2341.

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We herein report a numerical investigation of dual plasmon induced transparency (PIT) effect in two-dimensional plasmonic metamaterials composed of two C-shaped resonators and one U-shaped resonator. The finite difference time domain (FDTD) method is herein introduced to analyze transmission properties and electromagnetic field distributions of certain resonance wavelengths. It was found that, the PIT spectral response was affected by parameters of plasmonic metamaterials, such as the widths of C-shaped resonator and U-shaped resonator, and edge-to-edge distance between the adjacent resonators

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2

Giacomozzi, Flavio, Emanuela Proietti, Giovanni Capoccia, et al. "Design of U-Shaped Frequency Tunable Microwave Filters in MEMS Technology." Sensors 23, no. 1 (2023): 466. http://dx.doi.org/10.3390/s23010466.

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U-shaped microwave resonators implemented by RF MEMS switches can be considered the result of a novel design approach for obtaining small-footprint tunable resonators, owing to the bent shape of the resonator and the microsystem solution for changing the frequency of resonance. In this paper, we discuss the design approach for potential configurations of U-shaped structures combined with ohmic RF MEMS switches. Owing to their prospective application in RADAR and satellite systems, the devices were assessed for K-Band operation, specifically for 15 GHz, 20 GHz, and 26 GHz. The ON-OFF states det

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3

Marcelli, Romolo, Giovanni Maria Sardi, Emanuela Proietti, et al. "MEMS-Switched Triangular and U-Shaped Band-Stop Resonators for K-Band Operation." Sensors 23, no. 19 (2023): 8339. http://dx.doi.org/10.3390/s23198339.

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Triangular resonators re-shaped into Sierpinski geometry and U-shaped resonators were designed, linking them with single-pole-double-through (SPDT) RF MEMS switches to provide frequency tuning for potential applications in the K-Band. Prototypes of band-stop narrowband filters working around 20 GHz and 26 GHz, interesting for RADAR and satellite communications, were studied in a coplanar waveguide (CPW) configuration, and the tuning was obtained by switching between two paths of the devices loaded with different resonators. As a result, dual-band operation or fine-tuning could be obtained depe

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4

Fomin, D. G., N. V. Dudarev, and S. N. Darovskikh. "Frequency-tunable device based on a multilayer strip-slot transition and its application for measuring the dielectric properties of materials." Ural Radio Engineering Journal 5, no. 3 (2021): 225–38. http://dx.doi.org/10.15826/urej.2021.5.3.002.

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The paper presents the results of theoretical and experimental researches of a frequency-tunable device based on the multilayer strip-slot transition with the U-shaped slot resonator of the variable length. The application of the presented device makes it possible to implement a resonant method for measuring the dielectric properties of materials in the microwave frequency range. The numerical simulation in the rigorous formulation of the electrodynamics problem is performed for the theoretical research. The aim of the theoretical research is to determine the electrical characteristics of the

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5

Boysunov, Botir Pulat ugli, and Larisa Alexandrovna Korotkova. "STUDY OF U-SHAPED DIELECTRIC RESONATOR ANTENNA." EURASIAN JOURNAL OF ACADEMIC RESEARCH 1, no. 1 (2021): 980–86. https://doi.org/10.5281/zenodo.4742268.

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<em>This article presents a U-shaped dielectric resonant antenna (DRA) of small size, but with a wide bandwidth. The antenna is made of a material with a very high dielectric constant (</em><em>= 81) and has a new shape that supports many modes. The size of the proposed antenna is smaller than that of other DRAS created for the 2.4 GHz – 3.0 GHz bands, while the achievable bandwidth resistance for S11 < -10 dB is about 22%. Thus, this antenna can be used for IEEE 802.11 b/g for WLAN (2.4-2.5 GHz) and LTE (2.5-2.7 GHz), and can also be modified for other frequency bands.</em>

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6

Poulami, Ghosh, Takawane Shradha, Burchunde Ishan, N. Gaikwad Ganesh, and Singh Rajesh. "Compact Dual Band MIMO Printed Monopole Antenna." Journal of Optoelectronics and Communication 7, no. 2 (2025): 14–19. https://doi.org/10.5281/zenodo.15449463.

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<em>This paper presents the design of a compact MIMO (Multiple input Multiple output) antenna which resonates at dual band frequencies (2.4 GHz and 5.4 GHz). The U-shaped resonator is incorporated to reduce mutual coupling at 5.4 GHz (achieving - 32 dB isolation), while the rectangular slot structure effectively minimizes mutual coupling at 2.4 GHz (achieving -28 dB isolation). The return loss is below -15 dB at both frequency bands, ensuring excellent impedance matching. These design elements enhance antenna performance and improve isolation between MIMO elements. The simulated results demons

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7

Xiao, Gongli, Yanping Xu, Hongyan Yang, et al. "High Sensitivity Plasmonic Sensor Based on Fano Resonance with Inverted U-Shaped Resonator." Sensors 21, no. 4 (2021): 1164. http://dx.doi.org/10.3390/s21041164.

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Herein, we propose a tunable plasmonic sensor with Fano resonators in an inverted U-shaped resonator. By manipulating the sharp asymmetric Fano resonance peaks, a high-sensitivity refractive index sensor can be realized. Using the multimode interference coupled-mode theory and the finite element method, we numerically simulate the influences of geometrical parameters on the plasmonic sensor. Optimizing the structure parameters, we can achieve a high plasmonic sensor with the maximum sensitivity for 840 nm/RIUand figure of merit for 3.9 × 105. The research results provide a reliable theoretical

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8

Chen, Yishu, Jijun Feng, Jian Chen, et al. "Optical Bistability in a Tunable Gourd-Shaped Silicon Ring Resonator." Nanomaterials 12, no. 14 (2022): 2447. http://dx.doi.org/10.3390/nano12142447.

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In this study, a tunable gourd-shaped ring resonator is demonstrated to generate optical bistability. The system consists of two sub-rings for a gourd shape configuration with a U-shaped wave guiding pathway. The transfer matrix method and FDTD simulation are used to acquire the spectral characteristics of the system. For the fabricated device, the spectra profile and extinction ratio can be effectively tuned by the microheater above the U-shaped waveguide, which matches with the theoretical results. Due to the gourd structure of the resonator, the light waves in two rings can be cross-coupled

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9

Pourasad, Yeganeh, and Gholamreza Karimi. "Design of ultra compact dual-band bandpass filter using L-shaped resonator." International Journal of Microwave and Wireless Technologies 9, no. 3 (2017): 493–97. http://dx.doi.org/10.1017/s175907871600009x.

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A compact dual-band microstrip bandpass filter (BPF) is presented for application at the frequencies 2.4 and 5.84 GHz. The proposed main resonator consists of two L-shaped resonators. To improve the upper-stopband of the proposed filter, modified U-Shaped resonators are accepted. The operation mechanism of the filter is investigated based on proffered equivalent-circuit model and transformation function. The sketched dual-band BPF attends the insertion loss less than 0.1 and 0.4 dB Also the return loss is 26 and 28 dB at 2.4 and 5.84, respectively. This proffered filter structure is proper for

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10

Amadou Mouctar Balde, Thierno, Franklin Manene, and Franck Moukanda Mbango. "A dualband bandpass filter with tunable bandwidths for automotive radar and 5G millimeter-wave applications." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 309. http://dx.doi.org/10.11591/ijeecs.v27.i1.pp309-317.

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A compact dual wideband bandpass filter for automotive radar (AR) and 5G millimeter-wave (mmWave) applications with adjustable bandwidths is presented in this work. The filter is based on microstrip dual-mode edge-coupled stub-loaded resonators (SLR). The novelty of this configuration is that it allows independent control of the bandwidths which is not obvious for many reported SLR-based filters. To achieve an overall size of 1.23λ_g× 2.02λ_g, these resonators are coupled and bent int o U-shape, T-shape, and E-shape. The U-shaped resonator, based on a quarter-wavelength transmission line, is c

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11

Thierno, Amadou Mouctar Balde1, Manene2 Franklin, and Moukanda Mbango3 4. Franck. "A dualband bandpass filter with tunable bandwidths for automotive radar and 5G millimeter-wave applications." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 309–17. https://doi.org/10.11591/ijeecs.v27.i1.pp309-317.

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A compact dual wideband bandpass filter for automotive radar (AR) and 5G millimeter-wave (mmWave) applications with adjustable bandwidths is presented in this work. The filter is based on microstrip dual-mode edgecoupled stub-loaded resonators (SLR). The novelty of this configuration is that it allows independent control of the bandwidths which is not obvious for many reported SLR-based filters. To achieve an overall size of 1.23λ_g× 2.02λ_g, these resonators are coupled and bent into U-shape, T-shape, and Eshape. The U-shaped resonator, based on a quarter-wavelength transm

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12

Iqbal, Amjad, Ahsan Altaf, Mujeeb Abdullah, Mohammad Alibakhshikenari, Ernesto Limiti, and Sunghwan Kim. "Modified U-Shaped Resonator as Decoupling Structure in MIMO Antenna." Electronics 9, no. 8 (2020): 1321. http://dx.doi.org/10.3390/electronics9081321.

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This paper presents an isolation enhancement of two closely packed multiple-input multiple-output (MIMO) antenna system using a modified U-shaped resonator. The modified U-shaped resonator is placed between two closely packed radiating elements resonating at 5.4 GHz with an edge to edge separation distance of 5.82 mm (λ∘/10). Through careful adjustment of parametric modelling, the isolation level of −23 dB among the densely packed elements is achieved. The coupling behaviour of the MIMO elements is analysed by accurately designing the equivalent circuit model in each step. The antenna performa

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13

Yang, Zhou, Qingli Zhou, Wen Long, et al. "Study of asymmetric U-shaped resonator at terahertz frequencies." Optics Communications 368 (June 2016): 119–22. http://dx.doi.org/10.1016/j.optcom.2016.01.087.

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14

Fomin, D. G., N. V. Dudarev, S. N. Darovskikh, and V. K. Baranov. "The Investigation of the Volumetric Strip-Slot Transition with U-Shaped Slot Resonator." Ural Radio Engineering Journal 4, no. 3 (2020): 277–92. http://dx.doi.org/10.15826/urej.2020.4.3.002.

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The application of volumetric strip-slot transition for the implementationof wireless devices with contactless frequency-selective transmission of microwave signals is relevant. This is due to the compactness of volumetric strip-slot transition achieved by the multilayer arrangement of its functional parts and of its electrical frequency-selective characteristics. At the same time the volumetric-modular design allows the replacement of its individual components which provides high functional flexibility of the device. Reducing of weight and dimensions of the volumetric strip-slot transition wh

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15

Wu, Rui, Jianhong Lin, and Shuting Cai. "Multi-mode wideband antenna based on multi-mode resonator." International Journal of Applied Electromagnetics and Mechanics 73, no. 3 (2023): 225–34. http://dx.doi.org/10.3233/jae-230116.

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A multi-mode wideband antenna based on multi-mode resonator is proposed with stable radiation patterns, which is composed of metal radiators, parasitic resonators, shorted patches fed by the U-shaped feedline, and a box-shaped reflector. A prototype of the proposed antenna is designed, fabricated, and tested. Measured results show that the antenna achieves an impedance bandwidth of 37.5% (0.67–0.98 GHz) for |S11| < −15 dB, a half-power beam width (HPBW) of 67.5 ± 2.4 degree at H-plane (horizontal plane), and a gain of 8.0 ± 0.5 dBi. Furthermore, the cross-polarization discrimination (XPD) i

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16

Qin, Tao, Chenlu Huang, Yang Cai, and Xianqi Lin. "Dual-Band Frequency Selective Surface with Different Polarization Selectivity for Wireless Communication Application." Sensors 23, no. 9 (2023): 4264. http://dx.doi.org/10.3390/s23094264.

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This article proposes a dual-band, frequency- and polarization-selective surface. Multiple resonant modes are introduced using the U-shaped resonator with a ground via to achieve dual-band responses and polarization selectivity. Two symmetrically grounded U-shaped resonators are coupled through electrically coupled apertures in a common ground, resulting in a passband with two transmission zeros per polarization. A general design flowchart and additional examples at the S, X, and K-bands are presented as well. A prototype at X-band is analyzed, fabricated, and measured, showing the passband ce

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17

Khattou, S., M. Amrani, A. Mouadili, et al. "Three port photonic and plasmonic demultiplexers based on Cross and U-shaped stub structures: Application for filtering and sensing." Journal of Applied Physics 131, no. 15 (2022): 153102. http://dx.doi.org/10.1063/5.0085955.

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We propose the design of three port photonic and plasmonic demultiplexers where filtering toward the two outputs is based on the phenomena of Fano resonances and electromagnetically induced transparency (EIT). We use a Cross-shape resonator in one output and a U-shape resonator composed of two stubs in the other output. We give a theoretical demonstration of the geometrical parameters of both resonators in order to filter one wavelength in one output while leaving the other output unperturbed. These results are confirmed by experimental validation in the radio frequency domain and a numerical

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18

Iqbal, Amjad, Amor Smida, Nazih Mallat, Mohammad Islam, and Sunghwan Kim. "A Compact UWB Antenna with Independently Controllable Notch Bands." Sensors 19, no. 6 (2019): 1411. http://dx.doi.org/10.3390/s19061411.

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A minimally-sized, triple-notched band ultra-wideband (UWB) antenna, useful for many applications, is designed, analyzed, and experimentally validated in this paper. A modified maple leaf-shaped main radiating element with partial ground is used in the proposed design. An E-shaped resonator, meandered slot, and U-shaped slot are implemented in the proposed design to block the co-existing bands. The E-shaped resonator stops frequencies ranging from 1.8–2.3 GHz (Advanced Wireless System (AWS1–AWS2) band), while the meandered slot blocks frequencies from 3.2–3.8 GHz (WiMAX band). The co-existing

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19

Esmail, B. A. F., H. A. Majid, S. H. Dahlan, Z. Z. Abidin, M. K. A. Rahim, and R. Dewan. "Novel Metamaterial Structures with Low Loss at Millimeter Wave Frequency Range." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 2 (2018): 641. http://dx.doi.org/10.11591/ijeecs.v10.i2.pp641-647.

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Two novel millimeter-wave (MMW) metamaterials (MTMs) unit cells operate at 28 GHz for a future fifth generation (5G) mobile network applications had been designed, presented and numerically investigated. Two MTM structures are proposed; namely the double E-shaped resonator (DER) and T-U shaped resonator (TUSR). The DER and TUSR are consists of a double E and combined T-U shaped, each printed on front side of the substrate layer respectively. DER achieves a bandwidth of 0.5 GHz and a return loss of -34 dB, whereas TUSR features a bandwidth of 0.3 GHz and a return loss of -18 dB. The conventiona

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20

B., A. F. Esmail, A. Majid H., H. Dahlan S., Z. Abidin Z., K. A. Rahim M., and Dewan R. "Novel Metamaterial Structures with Low Loss at Millimeter Wave Frequency Range." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 2 (2018): 641–47. https://doi.org/10.11591/ijeecs.v10.i2.pp641-647.

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Two novel millimeter-wave (MMW) metamaterials (MTMs) unit cells operate at 28 GHz for a future fifth generation (5G) mobile network applications had been designed, presented and numerically investigated. Two MTM structures are proposed; namely the double E-shaped resonator (DER) and T-U shaped resonator (TUSR). The DER and TUSR are consists of a double E and combined T-U shaped, each printed on front side of the substrate layer respectively. DER achieves a bandwidth of 0.5 GHz and a return loss of -34 dB, whereas TUSR features a bandwidth of 0.3 GHz and a return loss of -18 dB. The conventiona

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21

Chu, Chenjie, Jiayi Huang, Xuan Xie, and Jun Zhang. "A Quasi-Distributed Crack Sensor Based on Weakly Coupled Vertical U-Shaped Ring Array." Sensors 25, no. 9 (2025): 2852. https://doi.org/10.3390/s25092852.

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Cracks are common defects in metallic components, the presence of which can significantly affect service life and operational stability. Sensors based on electromagnetic resonators have relatively high sensitivity; however, they are limited in size, which restricts their coverage and makes large-area monitoring unattainable. The uneven internal field distribution within the resonator is a critical factor contributing to sensitivity variation at different locations. In this study, a vertical U-shaped ring structure is excited using a microstrip line. This allows the sensor to achieve large-area

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22

Zhang, L. N., S. S. Zhong, and S. Q. Xu. "Broadband U-shaped dielectric resonator antenna with elliptical patch feed." Electronics Letters 44, no. 16 (2008): 947. http://dx.doi.org/10.1049/el:20081253.

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Tang, Jun, Qiang Zhu, Changlong Li, et al. "A U-shaped microwave resonator for flexible mechanical sensors application." Review of Scientific Instruments 90, no. 11 (2019): 114712. http://dx.doi.org/10.1063/1.5096420.

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24

Rocha, Rodrigo Tumolin, Nouha Alcheikh, Fahimullah Khan, and Mohammad I. Younis. "Dynamics Characterization of a U-Shaped Micro-Resonator Portal Frame." Journal of Microelectromechanical Systems 29, no. 5 (2020): 1362–71. http://dx.doi.org/10.1109/jmems.2020.3020230.

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Zhang, Li-Na, Shun-Shi Zhong, and Xian-Ling Liang. "Wideband U-shaped dielectric resonator antenna fed by triangle patch." Microwave and Optical Technology Letters 52, no. 11 (2010): 2435–38. http://dx.doi.org/10.1002/mop.25513.

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26

Farahat, Asmaa, and Khalid Hussein. "Dual-Band BSF with Enhanced Quality Factor." Applied Computational Electromagnetics Society 36, no. 1 (2021): 89–98. http://dx.doi.org/10.47037/2020.aces.j.360113.

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In the present work, a U-shaped CPW resonator (CPWR) with, generally, unequal arms is proposed to produce high Q-factor bandstop filter (BSF) based on broadside-coupling between the CPWR and a CPW through-line (CPWTL), which are printed on opposite faces of a thin substrate. The unequal arms of the U-shape and the finite width of the ground strips of the CPWR are shown to produce much higher Q-factor than that of equal arms and infinitely extending side ground planes. The dimensions of the CPWTL are optimized for impedance matching while the dimensions of the CPWR are optimized to obtain the h

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27

Iqbal, Amjad, Jun Jiat Tiang, Sew Kin Wong, Mohammad Alibakhshikenari, Francisco Falcone, and Ernesto Limiti. "Multimode HMSIW-Based Bandpass Filter with Improved Selectivity for Fifth-Generation (5G) RF Front-Ends." Sensors 20, no. 24 (2020): 7320. http://dx.doi.org/10.3390/s20247320.

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This article presents the detailed theoretical, simulation, and experimental analysis of a half-mode substrate integrated waveguide (HMSIW)-based multimode wideband filter. A third-order, semicircular HMSIW filter is developed in this paper. A semicircular HMSIW cavity resonator is adopted to achieve wide band characteristics. A U-shaped slot (acts as a λ/4 stub) in the center of a semicircular HMSIW cavity resonator and L-shaped open-circuited stubs are used to improve the out-of-band response by generating multiple transmission zeros (TZs) in the stop-band region of the filter. The TZs on ei

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28

Wan, Ming Li, Shu Qing Yuan, Yue Li Song, Yong Li, Mingli Tian, and Feng Qun Zhou. "Magnetic-coupling induced transparency in a planar terahertz metamaterial." International Journal of Modern Physics B 29, no. 17 (2015): 1550114. http://dx.doi.org/10.1142/s0217979215501143.

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In this paper, we demonstrate that an electromagnetically induced transparency (EIT)-like behavior is induced by the coupling of two magnetic resonances in a planar terahertz (THz) metamaterial structure, which consists of a U-shaped split ring (USR) as one bright resonator and a cut wire pair (CWP) as one dark resonator. It is found that the EIT-like spectral response is insensitive to the lateral distance between the two magnetic resonators, whereas an on-to-off modulation of the amplitude of the transparency window can be achieved by moving the USR vertically along the CWP. The underlying p

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Messaoudene, Idris, Tayeb A. Denidni, and Abdelmadjid Benghalia. "Low-profile U-shaped DRA for ultra-wideband applications." International Journal of Microwave and Wireless Technologies 9, no. 3 (2016): 621–27. http://dx.doi.org/10.1017/s1759078716000155.

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In this paper, a microstrip-fed U-shaped dielectric resonator antenna (DRA) is simulated, designed, and fabricated. This antenna, in its simple configuration, operates from 5.45 to 10.8 GHz. To enhance its impedance bandwidth, the ground plane is first modified, which leads to an extended bandwidth from 4 to 10.8 GHz. Then by inserting a rectangular metallic patch inside the U-shaped DRA, the bandwidth is increased more to achieve an operating band from 2.65 to 10.9 GHz. To validate these results, an experimental antenna prototype is fabricated and measured. The obtained measurement results sh

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Chen, Jian, Wenzhi Gao, Changhai Liu, Liangguo He, and Yishan Zeng. "Improving Output Performance of a Resonant Piezoelectric Pump by Adding Proof Masses to a U-Shaped Piezoelectric Resonator." Micromachines 12, no. 5 (2021): 500. http://dx.doi.org/10.3390/mi12050500.

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This study proposes the improvement of the output performance of a resonant piezoelectric pump by adding proof masses to the free ends of the prongs of a U-shaped piezoelectric resonator. Simulation analyses show that the out-of-phase resonant frequency of the developed resonator can be tuned more efficiently within a more compact structure to the optimal operating frequency of the check valves by adjusting the thickness of the proof masses, which ensures that both the resonator and the check valves can operate at the best condition in a piezoelectric pump. A separable prototype piezoelectric

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Liu, Beijia, Jinghui Qiu, Lijia Chen, and Guoqiang Li. "Dual Band-Notched Rectangular Dielectric Resonator Antenna with Tunable Characteristic." Electronics 8, no. 5 (2019): 472. http://dx.doi.org/10.3390/electronics8050472.

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A dual band-notched reconfigurable dielectric resonator antenna (DRA) is proposed in this paper. A rectangular dielectric resonator excited by stepped offset microstrip feedline generates multiple resonant modes for wideband performance. Moreover, the typical stepped impedance feedline and partial ground plane with one rectangular notch are adopted for contributing for better impedance matching. On this basis, a five-line coupler resonator (FLCR) composed by inverted U-shaped and 山-shaped structures is introduced as a bandstop filter in the microstrip feedline, and dual rejected bands are crea

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Paul, P. M., K. Kandasamy, and M. S. Sharawi. "A Multi-Band U-Strip and SRR Loaded Slot Antenna with Circular Polarization Characteristics." Advanced Electromagnetics 9, no. 1 (2020): 41–48. http://dx.doi.org/10.7716/aem.v9i1.1183.

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A compact multiband circularly polarized slot antenna is proposed here. An F-shaped microstrip feedline is used to excite the square slot antenna loaded with a U-shaped strip and a split ring resonator (SRR) to generate three circularly polarized bands at 1.5 GHz, 2.75 GHz and 3.16 GHz. A meandered slot is used in the feedline and the U-strip to improve the axial ratio bandwidth (ARBW). The meandered feedline excites the slot to produce resonance at 2.5 GHz. This resonance along with that of the F-shaped feed, loaded SRR and U-strip combine to give rise to three circularly polarized bands whic

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33

Li, Hui, Le Kang, Da-Wei Mi, and Ying-Zeng Yin. "Simple dual band-notched UWB antenna loaded with single U-shaped resonator." Microwave and Optical Technology Letters 57, no. 9 (2015): 2129–34. http://dx.doi.org/10.1002/mop.29283.

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Babaiy Tooski, Majid, Abbas Maleki, Abdolah Eslami Majd, and Hassan Ebadian. "Continuous-wave and pulsed operation of Ho:YLF laser end-pumped by Tm:fiber laser." Laser Physics 32, no. 7 (2022): 075101. http://dx.doi.org/10.1088/1555-6611/ac70d7.

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Abstract Continuous-wave and pulsed operation of a Ho:YLF laser was demonstrated. A Tm:fiber laser with 70 W output power was used for the pump source. In this experimental setup, the end-pumped gain medium with 0.5% and 1% Ho concentration in the optical resonators were used. In the continuous-wave regime, 14.2 and 12.8 W linearly polarized power with a concave-concave resonator for 1.0% and 0.5% Ho dopes were extracted, respectively. These amounts correspond to slope efficiencies of 51.9% and 71.3% and optical-to-optical efficiencies of 39.4% and 54.7% for absorbed pump power, respectively.

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Ghosh, Chandan Kumar, Bappaditya Mandal, and Susanta Kumar Parui. "MUTUAL COUPLING REDUCTION OF A DUAL-FREQUENCY MICROSTRIP ANTENNA ARRAY BY USING U-SHAPED DGS AND INVERTED U-SHAPED MICROSTRIP RESONATOR." Progress In Electromagnetics Research C 48 (2014): 61–68. http://dx.doi.org/10.2528/pierc14020603.

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Baran, Błażej, Krystian Machaj, Ziemowit Malecha, and Krzysztof Tomczuk. "Numerical Study of Baroclinic Acoustic Streaming Phenomenon for Various Flow Parameters." Energies 15, no. 3 (2022): 854. http://dx.doi.org/10.3390/en15030854.

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The article presents a numerical study of the large-amplitude, acoustically-driven streaming flow for different frequencies of the acoustic wave and different temperature gradients between hot and cold surfaces. The geometries studied were mainly two-dimensional rectangular resonators of different lengths, but also one three-dimensional rectangular resonator and one long and narrow channel, representative of a typical U-shaped resistance thermometer. The applied numerical model was based on the Navier–Stokes compressible equations, the ideal gas model, and finite volume discretization. The osc

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Chen, Ting, Tianyu Xiang, Jianwei Wang, Mingxing Xu, and Tao Lei. "Tunable toroidal resonance based on hybrid graphene-metal metasurfaces." Journal of Applied Physics 132, no. 16 (2022): 165103. http://dx.doi.org/10.1063/5.0104043.

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With the rise of artificial magnetism and metamaterials, toroidal resonance has gained much attention for its special properties. In this paper, we propose a novel hybrid graphene-metal metamolecule consisting of a square bracket-like resonator and two asymmetric U-shaped resonators. By applying various Fermi energies to graphene, the amplitude of electromagnetically induced transparency (EIT) can be efficiently manipulated, and the maximum amplitude modulation depth can attain 81% in the microwave region. Numerical simulations and theoretical analysis demonstrate that the dynamic manipulation

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Wang, Ben-Xin, and Gui-Zhen Wang. "Novel quad-band terahertz metamaterial absorber based on single pattern U-shaped resonator." Applied Physics Express 10, no. 3 (2017): 034301. http://dx.doi.org/10.7567/apex.10.034301.

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Hayati, Mohsen, and Farzin Shama. "Compact Microstrip Low-Pass Filter with wide stopband using symmetrical U-shaped resonator." IEICE Electronics Express 9, no. 3 (2012): 127–32. http://dx.doi.org/10.1587/elex.9.127.

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Chen, Jian, Dan Huang, and Zhi Hua Feng. "A U-shaped piezoelectric resonator for a compact and high-performance pump system." Smart Materials and Structures 24, no. 10 (2015): 105009. http://dx.doi.org/10.1088/0964-1726/24/10/105009.

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Flores-Leal, R., H. Jardon-Aguilar, A. Tirado-Mendez, and R. Acevo-Herrera. "Reduced microstrip slot multiband antenna with A U-shaped resonator for wlan applications." Microwave and Optical Technology Letters 54, no. 12 (2012): 2684–89. http://dx.doi.org/10.1002/mop.27187.

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Jiang, Kang, Songtao Xue, Liyu Xie, and Guochun Wan. "A cross-polarized antenna sensor based on U-shaped resonator for crack sensing." Measurement 231 (May 2024): 114592. http://dx.doi.org/10.1016/j.measurement.2024.114592.

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Kumar, Om Prakash, Pramod Kumar, and Tanweer Ali. "A Compact Dual-Band Notched UWB Antenna for Wireless Applications." Micromachines 13, no. 1 (2021): 12. http://dx.doi.org/10.3390/mi13010012.

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This article presents the design and analysis of a V-shaped ultrawideband (UWB) antenna and dual-band UWB notch antenna. A rectangular slot is cut into a semicircular partial ground plane of the antenna to achieve ultrawide bandwidth. A U-shape slot is etched on a V-shaped patch that radiates, and an inverted U-shape parasitic resonator is placed beside the feedline to generate dual-band notch characteristics. The overall dimension of the proposed antenna is 28×23 mm2. The proposed UWB antenna has a gain of 9.8 dB, S11 < −10 dB, impedance bandwidth in the range of 3.4 to 12.3 GHz, response

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Jenan, Ayad, and A. Jalil Mustafa. "Design of dual-mode SIR bandpass filter based on shorting pin for wireless communication applications." Indonesian Journal of Electrical Engineering and Computer Science (IJEECS) 18, no. 3 (2020): 1375–82. https://doi.org/10.11591/ijeecs.v18.i3.pp1375-1382.

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A new design of microstrip dual mode band-pass-filter (BPF) by using stepped impedance resonator (SIR) based on shorting pin is proposed. The designed structure use two U-shaped tri-sections SIR resonators coupled to each other and a two coupled line feeding ports each of 50 ohm impedance. Shorting pins are used to excite the upper frequency passband in the re sponse of the filter due to current distribution perturbation at the locations of the shorting pins. For demonstration, WLAN (5.2-5.7 GHz) and GSM (1.85-1.99 GHz) and Advanced Wireless Services (AWS) (1.71-1.755 GHz). The return losses a

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Wei, Buzheng, and Shuisheng Jian. "Fano resonance in a U-shaped tunnel assisted graphene-based nanoring resonator waveguide system." Optics Communications 425 (October 2018): 24–28. http://dx.doi.org/10.1016/j.optcom.2018.04.067.

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Cheng, Chien Min, Kai Huang Chen, Yuan Tai Hsieh, Fuh Cheng Jong, and Shih Fang Chen. "Develop Dual-Mode DGS Bandpass Filters Using High Quality Factor Aluminum Oxide Ceramic Substrates." Key Engineering Materials 512-515 (June 2012): 1115–18. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1115.

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Aluminum Oxide microwave dielectric ceramics exhibit good microwave dielectric characteristics and suitable be used in the microwave devices. In this letter, using screen-printing technique and Ag/Pd paste, a novel dual-mode 2.4 GHz microstrip bandpass filter with U-shaped defected ground structure is screen printed on the Aluminum Oxide (Al2O3, relative dielectric constant=9.8) microwave dielectric ceramic substrate. In addition, a pair of input/output microstrip lines are designed to be 50 Ω and coupled to a λ/4×λ/4 square loop resonator. And in the ground plane, a U-shaped defected ground s

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Belyaev B. A., Serzhantov A. M., Leksikov A. A., Bal’va Ya. F., Alexandrovsky A.A., and Galeev R. G. "A high-selectivity waveguide bandpass filter with interference suppression by more than 120 dB in rejection band." Technical Physics Letters 49, no. 5 (2023): 72. http://dx.doi.org/10.21883/tpl.2023.05.56034.19541.

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The design of a 10th-order waveguide bandpass filter with an additional inductive cross-coupling between non-adjacent resonators has been proposed and studied. An inductive coupling is formed by a U-shaped conductor structure with grounded ends that is formed in the filter cover. This method of cross-coupling organization ensures not only the temperature stability of the characteristics, but also the manufacturability of the structure. The high selectivity of the device is achieved by both the attenuation poles located near the passband, as well as the level of suppression in the stopbands, ex

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DEBAB, Mohamed, and Zoubir MAHDJOUB. "Single Band Notched Characteristics UWB Antenna using a Cylindrical Dielectric Resonator and U-shaped Slot." Journal of Microwaves, Optoelectronics and Electromagnetic Applications 17, no. 3 (2018): 340–51. http://dx.doi.org/10.1590/2179-10742018v17i31190.

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Ali, N. O., M. R. Hamid, M. K. A. Rahim, N. A. Murad, and S. Thomas. "A Compact Second-order Chebyshev Bandpass Filter Using U-shaped Resonator and Defected Ground Structure." Radioengineering 29, no. 2 (2020): 321–27. http://dx.doi.org/10.13164/re.2020.0321.

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Hu, Dan, Hong-yan Wang, and Qiao-fen Zhu. "Design of Six-Band Terahertz Perfect Absorber Using a Simple U-Shaped Closed-Ring Resonator." IEEE Photonics Journal 8, no. 2 (2016): 1–8. http://dx.doi.org/10.1109/jphot.2016.2538758.

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