Bibliografias temáticas / Omnidirectional circular polarization (OCP)

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Literatura científica selecionada sobre o tema "Omnidirectional circular polarization (OCP)"

Autor: Grafiati

Publicado: 8 de fevereiro de 2025

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Artigos de revistas sobre o assunto "Omnidirectional circular polarization (OCP)"

Yufeng Yu, Zhongxiang Shen e Sailing He. "Compact Omnidirectional Antenna of Circular Polarization". IEEE Antennas and Wireless Propagation Letters 11 (2012): 1466–69. http://dx.doi.org/10.1109/lawp.2012.2231392.

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Wei, Kun, Jian-Ying Li, Ling Wang e Zijian Xing. "A NEW OMNIDIRECTIONAL CIRCULAR POLARIZATION MICROSTIP ANTENNA". Progress In Electromagnetics Research Letters 53 (2015): 45–50. http://dx.doi.org/10.2528/pierl15030902.

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Wu, Junyan, Jiaao Yu e Qin Tao. "Design of a Missile-borne Conformal Microstrip Navigation Antenna". MATEC Web of Conferences 232 (2018): 04080. http://dx.doi.org/10.1051/matecconf/201823204080.

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A missile-borne conformal dual-fed circular polarized microstrip antenna array is designed and fabricated, which realized omnidirectional radiation in horizontal direction. Frequencies of the antenna include GPS L1 frequency (1.575GHz) and Beidou navigation system B1 frequency (1.562GHz). Based on the HFSS simulation, the influence of conformation is analyzed on S11, axial ratio and gain of antenna array. The size of microstrip patches is changed so that the influence of conformation on antenna can be reduced. The circular polarization performance and the circular polarization gain of the antenna are also improved. The antenna array prototype is fabricated and measured. The result shows that the S11 parameter of the antenna is less than -10dB in the 1.55~1.60GHz frequency band. At the GPS L1 frequency and the Beidou B1 frequency, the maximum of horizontal omnidirectional gain is 1.73dB, 1.25dB respectively. The out-of-roundness of the radiation pattern is less than 2.5dB. The antenna has a good horizontal omnidirectional circular polarization radiation performance.

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Zhang, Ke, Xiangjun Li, Lei Chen, Zengjun Liu e Yuchen Xie. "Impact Analysis of Orthogonal Circular-Polarized Interference on GNSS Spatial Anti-Jamming Array". Remote Sensing 16, n.º 23 (1 de dezembro de 2024): 4506. https://doi.org/10.3390/rs16234506.

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With the continuous advancement of electromagnetic countermeasures, new types of interference signals (e.g., multi-polarization suppression interference) pose a significant threat to conventional Global Navigation Satellite System (GNSS) services, even when the receiver employs a right-handed circularly polarized (RHCP) anti-jamming array. This paper proposes a receiving signal model for orthogonal circularly polarized (OCP) interference signals based on conventional arrays, following an analysis of the non-ideal characteristics of actual arrays. Furthermore, the mechanism by which OCP interference signals affect anti-jamming performance is examined. Power inversion (PI) and linear constrained minimum variance (LCMV) techniques, applied to both uniform linear arrays and central circular arrays, are utilized to verify the impact of these interference signals. Simulation and physical testing demonstrate that OCP interference significantly affects the interference subspace of the conventional RHCP array, potentially leading to a reduction in the anti-jamming performance of the receiver. To effectively suppress multi-polarization interference, anti-jamming GNSS receivers must either ensure the consistency of cross-polarization among the elements of the array or adopt polarization-sensitive arrays.

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Su, Changjiang, Yanqun Liu, Leilei Liu, Mei Yang, Hongxin Zhao e Xiaoxing Yin. "Experimental Evaluation of Multipath Mitigation in TDOA-Based Indoor Passive Localization System Using A Beam Steering Broadband Circular Polarization Antenna". Electronics 7, n.º 12 (1 de dezembro de 2018): 362. http://dx.doi.org/10.3390/electronics7120362.

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An experimental evaluation of multipath mitigation using a beam steering broadband circular polarization antenna (BSBCPA) in indoor passive localization system based on time differences of arrival (TDOA) is presented in this paper. The BSBCPA consists of a beam switch network, four identical hexagon patch elements and their respective feeding networks. By controlling the states of a radio frequency (RF) switch in the beam switch network, four steering circular polarization beams can be excited separately for azimuth omnidirectional coverage. Combining the spatial selectivity of steering beams and circular polarization in the BSBCPA, the positioning inaccuracy from indoor multipath propagation can be mitigated. In two different indoor environments with line of sight (LOS), complex multipath, when transmitting a 20 MHz bandwidth signal in WLAN, the 2D positioning mean error obtained is 0.7 m and 0.82 m, respectively. Compared with conventional omnidirectional linear polarization antenna (OLPA), the BSBCPA can at least improve positioning accuracy by 51%. The experimental results show that the proposed BSBCPA can significantly mitigate multipath propagation for TDOA-based indoor passive localization.

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Mulimbayan, Francis, e Manolo G. Mena. "Comparative Study of the Corrosion Behavior of Low-Nickel AISI 202 and Conventional AISI 304 Stainless Steels in Citric Acid Using Electrochemical Techniques". Applied Mechanics and Materials 835 (maio de 2016): 131–35. http://dx.doi.org/10.4028/www.scientific.net/amm.835.131.

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Stainless steel (SS) is one of the most commonly used metallic food contact materials. It may be classified based on its microstructure whether ferritic, austenitic, martensitic, duplex or precipitation hardened. Austenitic SS, among mentioned grades, has the largest contribution to market due to its numerous industrial and domestic applications. In this study, the corrosion behavior of AISI 202 SS – a cheaper grade of stainless steel, in three different solution temperatures of citric acid was investigated using different electrochemical techniques such as open-circuit potential (OCP) measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results were compared to that obtained from conventional AISI 304 SS. OCP, polarization and impedance measurements agreed that AISI 202 SS has comparable resistance to that of AISI 304 SS in citric acid at ambient temperature and at 50 °C. At 70 °C, results of OCP measurements suggest that AISI 304 SS exhibited greater performance as indicated by more positive OCP values in the designated solution. EIS results indicate that the two alloys have identical corrosion resistance even at 70 °C as indicated by their comparable polarization resistance (Rp). The corrosion mechanism in both alloys is charge-transfer controlled as indicated by depressed semi-circular appearance of the generated Nyquist plots. The values of corrosion current densities (icorr) extracted from polarization curves indicate that the initial corrosion rates were higher in AISI 304 than AISI 202 SS suggesting that formation of more protective film may have occurred on the former alloy.

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Wei, Qian, Jiaju Wu, Zhiwei Guo, Xiaotian Xu, Ke Xu, Yong Sun, Yunhui Li, Haitao Jiang e Hong Chen. "Photonic Bandgaps of One-Dimensional Photonic Crystals Containing Anisotropic Chiral Metamaterials". Photonics 9, n.º 6 (10 de junho de 2022): 411. http://dx.doi.org/10.3390/photonics9060411.

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Conventional photonic bandgaps (PBGs) for linear polarization waves strongly depend on the incident angle. Usually, PBGs will shift toward short wavelengths (i.e., blue-shifted gaps) as the incident angle increases, which limits their applications. In some practices, the manipulation of PBGs for circular polarization waves is also important. Here, the manipulation of PBGs for circular polarization waves is theoretically investigated. We propose one-dimensional photonic crystals (1DPCs) containing anisotropic chiral metamaterials which exhibit hyperbolic dispersion for left circular polarization (LCP) wave and elliptical dispersion for right circular polarization (RCP) wave. Based on the phase variation compensation effect between anisotropic chiral metamaterials and dielectrics, we can design arbitrary PBGs including zero-shifted and red-shifted PBGs for LCP wave. However, the PBGs remain blue-shifted for RCP wave. Therefore, we can design a high-efficiency wide-angle polarization selector based on the chiral PBGs. Our work extends the manipulation of PBGs for circular polarization waves, which has a broad range of potential applications, including omnidirectional reflection, splitting wave and enhancing photonic spin Hall effect.

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Zhou, Yun, Shaojun Fang, Hongmei Liu, Zhongbao Wang e Te Shao. "A Function Reconfigurable Antenna Based on Liquid Metal". Electronics 9, n.º 5 (24 de maio de 2020): 873. http://dx.doi.org/10.3390/electronics9050873.

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To meet the demands of maritime transportation on ships, including satellite positioning, wireless communication, and radio frequency identification (RFID) for cargo handling management, a function reconfigurable antenna based on liquid metal is proposed in this paper. The antenna is composed of 3-D-printed hollow cavities, a two-step impedance feeding sheet, and two feeding probes. The 3-D-printed hollow cavities contain a big hollow helix cavity, a hollow cone loaded cylinder cavity, four hollow cylinder cavities, and four small hollow helix cavities. By filling the liquid metal into different hollow cavities, reconfigurable functions are generated, including right-handed circular polarization (RHCP), omnidirectional linear polarization (O-LP), pattern reconfigurable circular polarization, and omnidirectional left-handed circular polarization (O-LHCP). To illustrate this, a prototype is fabricated using 3-D-printed photopolymer resin and etching technology. The measurement results agree well with the simulated ones in terms of return loss, radiation pattern, gain, and axial ratio (AR). For the five reconfigurable states, the measured relative bandwidths for |S11| < −10 dB are 44.7%, 41.7%, 30.4%, 28.1%, and 10.8%, respectively, which covers the bands of a global navigation satellite system (GNSS), wireless communication system, and RFID communication system. Attributing to the advantages of its compact structure, flexible conversion, and good performance, the proposed antenna is a good candidate for maritime transportation applications.

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Keshari, Jaishanker Prasad, Binod Kumar Kanaujia, Mukesh Kumar Khandelwal, Pritam Singh Bakariya e Ram Mohan Mehra. "Omnidirectional multi-band stacked microstrip patch antenna with wide impedance bandwidth and suppressed cross-polarization". International Journal of Microwave and Wireless Technologies 9, n.º 3 (24 de fevereiro de 2016): 629–38. http://dx.doi.org/10.1017/s1759078716000209.

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In this paper, triple-band stacked microstrip patch antennas (MPAs) are presented with wide impedance bandwidth and suppressed cross-polarization level. Triangular and circular shaped slots are embedded in the patch of antenna. Slot-loaded microstrip patches are fed with meandered microstrip line supported by a semi-ground plane structure. Triangular shaped slot-loaded MPA shows triple resonance at frequencies 2.2, 4.45, and 5.3 GHz having bandwidth of 45.9, 19.23, and 15.67%, respectively. Circular shaped slot-loaded MPA also shows triple resonance at frequencies 2.2, 4.42, and 5.38 GHz having bandwidth of 50.24, 33.21, and 13.43%, respectively. Using circular slot in place of triangular; bandwidth of the first and the second band is improved by 4.34 and 13.98%, respectively. Both the proposed antennas show an omnidirectional radiation pattern at all three resonance frequencies in the xz-plane with almost 0 dBi gain. Both the proposed antennas are fabricated on a FR-4 epoxy substrate and show a minimum level of cross-polarization radiations.

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Li, Weiwei, Kwok Wa Leung e Nan Yang. "Omnidirectional Dielectric Resonator Antenna With a Planar Feed for Circular Polarization Diversity Design". IEEE Transactions on Antennas and Propagation 66, n.º 3 (março de 2018): 1189–97. http://dx.doi.org/10.1109/tap.2018.2794323.

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Mais fontes

Teses / dissertações sobre o assunto "Omnidirectional circular polarization (OCP)"

Positano, Francesco. "Antennes reconfigurables pour réseaux IoT modernes : principes de conception et stratégies de mise en œuvre". Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ4062.

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La croissance rapide des applications de l’Internet des objets (IoT) a entrainé une forte demande en technologies sans fil avancées. Dans le contexte d’un paysage numérique en constante évolution, les antennes reconfigurables sont devenues un point focal crucial en raison de leur nature adaptable. Ce travail offre un aperçu complet du paysage actuel des technologies IoT et sans fil, en mettant l’accent sur les normes compatibles avec l’IoT et la manière dont elles ont influencé la conception des antennes. Cette recherche explore les défis de la conception, de l’optimisation et de la mise en œuvre de ces antennes spécifiquement pour les réseaux IoT modernes. Les principes fondamentaux des antennes miniatures électriquement petites (ESA) et des conceptions d’antennes reconfigurables pour les applications IoT constituent la base de ce travail. Tout d’abord, l’exploration d’une antenne à polarisation circulaire omnidirectionnelle (OCP) miniature est effectuée, et une analyse approfondie de ses paramètres d’optimisation et de sa polarisation circulaire est réalisée. Une étude sur l’antenne OCP reconfigurable est également fournie, avec un accent sur les stratégies de mise en œuvre pratique. En outre, la recherche explore la reconfigurabilité du diagramme, une caractéristique qui permet à l’antenne de modifier dynamiquement son diagramme de rayonnement. Une antenne à réseau parasitaire orientable électroniquement (ESPAR) reconfigurable et à profil bas est conçu et optimisé, avec présentation et analyse des résultats mesurés. La recherche propose également des solutions potentielles au problème de réoptimisation associé à la mise en œuvre pratique des circuits de commutation. L’étude inclut également des tests sur le terrain en conditions réelles. La conception et les essais sur le terrain d’une antenne ESPAR pour les applications IoT à longue portée basées sur les véhicules aériens sans pilote (UAV) sont discutés, en couvrant l’intégration du transceiver. Enfin, ce travail aborde la conception d’une antenne reconfigurable en fréquence pour les communications IoT basées sur les satellites, avec les défis de la miniaturisation et de la reconfigurabilité au premier plan
The rapid growth of Internet of Things (IoT) applications has led to a surge in demand for advanced wireless technologies.In the context of an ever-evolving digital landscape, reconfigurable antennas have emerged as a pivotal focus due to their adaptive nature.This work provides a comprehensive overview of the current landscape of IoT and wireless technologies, with a focus on the IoT-compliant standards and how they have influenced antenna design. This research explores the challenges of designing, optimizing, and implementing these antennas specifically for modern IoT networks. The fundamental principles of miniature Electrically Small Antennas (ESA)s and reconfigurable antennas designs for IoT applications builds the foundation of this work.Firstly, the exploration of a miniature Omnidirectional Circular Polarization (OCP) antenna, and an in-depth analysis of its optimization parameters and circular polarization is carried out. A study on reconfigurable OCP antenna is also provided, with a stress on practical implementation strategies. Further, the research explores pattern reconfigurability, a feature that allows the antenna to dynamically alter its radiation pattern. A low-profile Pattern Reconfigurable Electronically Steerable Parasitic Array Radiator (ESPAR) is designed and optimized, with measured results presented and analyzed. The research also proposes potential solutions to the re-optimization problem associated with the practical implementation of switching circuits. The study also includes real-life field-testing. The design and on-field testing of an ESPAR antenna for Unmanned Aerial Vehicle (UAV) based long-range IoT applications are thus discussed, covering the integration of the transceiver. Finally, this work discusses the design of a frequency reconfigurable antenna for satellite-based IoT communications, with the challenges of miniaturization and reconfigurability at the forefront

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Zhu, Shaozhen (Sharon), Tahereh S. Ghazaany, Raed A. Abd-Alhameed, Steven M. R. Jones, James M. Noras, T. Suggett, Buren T. Van e S. Marker. "Improved bandwidth low-profile miniaturized multi-arm logarithmic spiral antenna". 2014. http://hdl.handle.net/10454/10834.

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Trabalhos de conferências sobre o assunto "Omnidirectional circular polarization (OCP)"

Iqbal, Sana, Muhammad Amin e Jawad Yousaf. "Designing omnidirectional bifilar Helix Antenna for circular polarization". In 2012 IEEE First AESS European Conference on Satellite Telecommunications (ESTEL). IEEE, 2012. http://dx.doi.org/10.1109/estel.2012.6400100.

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Kaivanto, E., E. Salonen e M. Berg. "Artificially anisotropic cylinder to convert omnidirectional linear polarization into circular polarization". In Loughborough Antennas & Propagation Conference (LAPC 2017). Institution of Engineering and Technology, 2017. http://dx.doi.org/10.1049/cp.2017.0295.

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Liu, Xiyao, Kwok Wa Leung, Yanting Liu e Nan Yang. "Mirror-Integrated Dielectric Resonator Antenna with Omnidirectional Circular Polarization". In 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC). IEEE, 2019. http://dx.doi.org/10.1109/csqrwc.2019.8799296.

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Golovin, V. V., e Y. N. Tyschuk. "Omnidirectional antenna with a radiation field of circular polarization". In 2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS 2012). IEEE, 2012. http://dx.doi.org/10.1109/uwbusis.2012.6379770.

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Varum, Tiago, Joao N. Matos, Pedro Pinho e Arnaldo Oliveira. "Printed antenna for DSRC systems with omnidirectional circular polarization". In 2012 15th International IEEE Conference on Intelligent Transportation Systems - (ITSC 2012). IEEE, 2012. http://dx.doi.org/10.1109/itsc.2012.6338677.

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Golovkov, Alexander, Alexander Zhuravlev e Polina Terenteva. "Omnidirectional in the Azimuth Plane Antennas Based on Circular Arrays with Horizontal Polarization for Radio Monitoring Systems". In 2020 9th Mediterranean Conference on Embedded Computing (MECO). IEEE, 2020. http://dx.doi.org/10.1109/meco49872.2020.9134165.

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Kamal, Shahanawaz, Ubaid Ullah e Slawomir Koziel. "A Printed Crossed-Dipole mmWave Antenna with Efficient Omnidirectional Circular Polarization for Wireless Surveillance in IOT Applications". In 2022 9th International Conference on Internet of Things: Systems, Management and Security (IOTSMS). IEEE, 2022. http://dx.doi.org/10.1109/iotsms58070.2022.10061943.

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