Готові списки джерел за темами / Antennes Vivaldi

Добірка наукової літератури з теми "Antennes Vivaldi"

Автор: Grafiati

Опубліковано: 9 вересня 2022

Оновлено: 18 вересня 2022

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Статті в журналах з теми "Antennes Vivaldi"

Ma, Fangyan, Xinpei Zhang, Yuanyuan Yin, Hang Yin, Chao Song, and Liqing Zhao. "Low-Cost Lens Antenna Design for Microwave Moisture Detection." International Journal of Antennas and Propagation 2022 (August 28, 2022): 1–12. http://dx.doi.org/10.1155/2022/3883786.

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In this study, a novel Vivaldi antenna with dimensions of 100 mm × 85 mm × 1.6 mm, designed for a moisture measurement system, is built to enhance the gain of conventional Vivaldi antennas in the low-frequency band to suit the needs of moisture detection. The fence structure and choke slot are modified to enhance the antenna’s radiation properties in the low-frequency band, and simulation is performed to determine how different structural parameters affect the antenna’s performance. The results show that in the frequency band of 5-6 GHz, the voltage standing-wave ratio (VSWR) of the antenna is less than 2, and the gain at 5.8 GHz reaches 16.2 dBi after installing the lens. Compared with conventional unmodified Vivaldi antennas, the gain at 5.8 GHz increases by approximately 6.11 dBi. The antenna is then processed and measured, and the measured results are in good agreement with the simulated results; hence, the antenna can be widely used in the field of moisture detection.

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Huang, Denghui, Hu Yang, Yuqing Wu, and Fei Zhao. "An X-Band Dual-Polarized Vivaldi Antenna with High Isolation." International Journal of Antennas and Propagation 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3281095.

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Анотація:

An X-band dual-polarized Vivaldi antenna with high isolation is proposed. The procedure of this antenna design includes the conventional Vivaldi antenna with regular slot edge (RSE), the dual-polarized Vivaldi antenna with two Vivaldi antennas which have different feeding point positions in a cross-shaped form, and the two Vivaldi antennas with a galvanic contact in soldering point. By applying the RSE, it reduced the dimensions of the Vivaldi antenna and improved its radiation performance. The modified antenna is fabricated and measured. The measured results show that S11<-10 dB at the entire X-band for the two Vivaldi antennas. The isolation (S21) between the two feeding ports, which has been improved by applying the different feeding point positions and the galvanic contact in soldering point, is better than 34 dB at X-band. In addition, the cross-polarized discrimination is better than 21 dB for the two Vivaldi antennas, and the measured results also include the gain of two Vivaldi antennas.

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Song, Li Zhong, Huan Feng Hong, and Jing Hong Xue. "Design and Performance Simulation of Two Kinds of Antipodal Vivaldi Antennas for Wide Band Radar Systems." Applied Mechanics and Materials 170-173 (May 2012): 2893–98. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2893.

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The Vivaldi antennas are widely used in many wide band electronic systems for its good performances. This paper designed and simulated two kinds of Vivaldi antennas for wide band passive radar applications, which are the antipodal Vivaldi antenna fed by strip line and antipodal Vivaldi antenna fed by microstrip line. The specific design parameters and the radiation performances of each kind of vivaldi antenna are provided over the operating frequency range of 3GHz to 11GHz. Furthermore a circular antenna array with six Vivaldi antenna elements fed by microstrip lines was also simulated to obtain its radiation performances over the operating frequency range of 3GHz to 8GHz. The simulation results demonstrate the designed Vivaldi antennas have acceptable performances of voltage standing wave ratio (VSWR), patterns and gains, so they can be used in practical wide band radars.

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Sonkki, Marko, Sami Myllymäki, Jussi Putaala, Eero Heikkinen, Tomi Haapala, Harri Posti, and Heli Jantunen. "Dual Polarized Dual Fed Vivaldi Antenna for Cellular Base Station Operating at 1.7–2.7 GHz." International Journal of Antennas and Propagation 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/1304359.

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The paper presents a novel dual polarized dual fed Vivaldi antenna structure for 1.7–2.7 GHz cellular bands. The radiating element is designed for a base station antenna array with high antenna performance criteria. One radiating element contains two parallel dual fed Vivaldi antennas for one polarization with 65 mm separation. Both Vivaldi antennas for one polarization are excited symmetrically. This means that the amplitudes for both antennas are equal, and the phase difference is zero. The orthogonal polarization is implemented in the same way. The dual polarized dual fed Vivaldi is positioned 15 mm ahead from the reflector to improve directivity. The antenna is designed for -14 dB impedance bandwidth (1.7–2.7 GHz) with better than 25 dB isolation between the antenna ports. The measured total efficiency is better than -0.625 dB (87%) and the antenna presents a flat, approximately 8.5 dB, gain in the direction of boresight over the operating bandwidth whose characteristics promote it among the best antennas in the field. Additionally, the measured cross polarization discrimination (XPD) is between 15 and 30 dB and the 3 dB beamwidth varies between 68° and 75° depending on the studied frequency.

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Ghimire, Jiwan, Feyisa Debo Diba, Ji-Hoon Kim, and Dong-You Choi. "Vivaldi Antenna Arrays Feed by Frequency-Independent Phase Shifter for High Directivity and Gain Used in Microwave Sensing and Communication Applications." Sensors 21, no. 18 (September 11, 2021): 6091. http://dx.doi.org/10.3390/s21186091.

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This paper describes a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer using a unique combination of power splitters based on binary T-junction power splitter topology, frequency-independent phase shifter, and a T-branch. The proposed antenna system consists of six Vivaldi antennas, three on the left, and three on the right arm. Each arm connects with T-junction power divider splitter topology, given that the right arm is linked through a frequency-independent phase shifter. Phase shifters ensure that the beam is symmetrical without splitting in a radiating plane so that highly directive radiation patterns occur. The optimal return losses (S-parameters) are well enriched by reforming Vivaldi’s feeding arms and optimizing Vivaldi slots and feeds. A novel feature of our design is that the antenna exhibits the arrangements of a T-junction power splitter with an out-of-phase feeding mechanism in one of the arms, followed by a T-branching feeding to even arrays of proper Vivaldi antenna arrangement contributing high realized gain and front-to-back ratio up to 14.12 dBi and 23.23 dB respectively applicable for not only ultra-wideband (UWB) application, also for sensing and position detecting. The high directivity over the entire UWB frequency band in both higher and lower frequency ranges ensures that the antenna can be used in microwave through-wall imaging along with resolution imaging for ground penetration radar (GPR) applications. The fabricated antenna parameters are in close agreement with the simulated and measured results and are deployed for the detection of targets inside the voids of the concrete brick.

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Ren, Jinjing, Hezhihan Fan, Qi Tang, Zhongyuan Yu, Yang Xiao, and Xiang Zhou. "An Ultra-Wideband Vivaldi Antenna System for Long-Distance Electromagnetic Detection." Applied Sciences 12, no. 1 (January 5, 2022): 528. http://dx.doi.org/10.3390/app12010528.

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Enlarging or reducing the antenna beam width of antennas can improve the positioning capability of detection systems. A miniaturized and easily fabricated ultra-wideband (UWB) antenna system for long-distance electromagnetic detection is proposed in this article. Two ultra-wideband Vivaldi antennae were designed. One was the transmitting antenna with a beam width of 90° or above, the other was a narrow beam antenna array with beam width less than 10°, as a receiving antenna. Both proposed antennae feature broadside gain diagrams with stable radiation patterns and wideband impedance matching in the frequency range between 2.5 GHz and 4 GHz. After detecting their frequency and time-domain behaviors, the detection system can achieve measurements covering a radius of 30 m.

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İlarslan, Mustafa, A. Serdar Türk, Salih Demirel, M. Emre Aydemir, and A. Kenan Keskin. "A Compact Vivaldi Shaped Partially Dielectric Loaded TEM Horn Antenna for UWB Communication." International Journal of Antennas and Propagation 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/847169.

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Ultrawideband (UWB) antennas are of huge demand and Vivaldi antennas as well as the TEM horn antennas are good candidates for UWB applications as they both have relatively simple geometry and high gain over a wide bandwidth. The aim of this study is to design a compact antenna that achieves maximum gain over a bandwidth between 1.5 and 10.6 GHz while minimizing its size. The idea is to make use of combined respective advantages of Vivaldi and TEM horn antennas to achieve the desired goals by shaping the TEM horn antenna to look like a Vivaldi antenna. The antenna structure is modified by a dielectric load in the center to increase the gain bandwidth. It is placed in a surrounding box made of PEC material to reduce the undesired side lobes and to obtain more directive radiation pattern. The simulations are performed by using the CST STUDIO SUITE electromagnetic (EM) simulation software and they are later verified by the actual measurements. The Vivaldi shaped partially dielectric loaded (VS-PDL) TEM horn antenna is proposed as a compact UWB antenna for systems using the newly established UWB band and also for the communication systems of popular bands like ISM, Wi-Fi, and GSM.

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MARUDDANI, BASO, EFRI SANDI EFRI SANDI, and MUHAMMAD FADHIL NAUFAL SALAM. "Perancangan dan Optimasi Antena Vivaldi pada Sistem Radar Penembus Permukaan (Ground Penetrating Radar)." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 7, no. 1 (January 24, 2019): 151. http://dx.doi.org/10.26760/elkomika.v7i1.151.

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ABSTRAKAntena Vivaldi merupakan salah satu jenis antena yang diimplementasikan pada radar penembus permukaan (Ground Penetrating Radar, GPR). GPR adalah salah satu metode non-destructive testing yang biasa digunakan untuk mengetahui kondisi beton/jalan raya. Penelitian ini merancang sebuah antena Vivaldi untuk digunakan pada GPR dengan frekuensi kerja 1 GHz – 2 GHz. Metode yang digunakan untuk merancang dan mengoptimasi antena Vivaldi adalah dengan mengubah beberapa parameter untuk mencapai spesifikasi yang diinginkan. Parameter tersebut antara lain lebar antena, panjang antena dan tapered slot. Optimasi yang dilakukan tetap memperhatikan pola radiasi antena agar tetap terarah. Hasil penelitian ini menghasilkan antena Vivaldi dengan dimensi 350x300 mm dengan return loss di bawah -10 dB pada rentang frekuensi 1 GHz – 2 GHz. Hasil penelitian juga menunjukkan bahwa perubahan nilai parameter lebar antena dan tapered slot menggeser frekuensi kerja antena secara signifikan.Kata kunci: Ground Penetrating Radar, Vivaldi, return loss, parameter antena ABSTRACTThe Vivaldi antenna is one type of antenna that is implemented on Ground Penetrating Radar (GPR). GPR is one of the non-destructive testing methods commonly used to determine the condition of concrete / highway. This studyaim to design a Vivaldi antenna to be used on GPR with a working frequency of 1 GHz - 2 GHz. The method that used to design and optimize Vivaldi antennas is by changing several parameters to achieve the desired specifications. These parameters include antenna width, antenna length and tapered slot. Optimization carried out still observes the radiation pattern of the antenna to keep it directed. The results showed that 350 x 300 mm antennas with return loss below -10 dB in the frequency range of 1 GHz - 2 GHz. The results also show that changes in the parameter width of the antenna and tapered slots shift the antenna working frequency significantly.Keywords: Ground Penetrating Radar, Vivaldi, return loss, antenna parameter

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Ghazali, Mohd Ifwat Mohd, and Premjeet Chahal. "Ultra-Wideband High Gain Vivaldi Antennas Using Additive Manufacturing." International Symposium on Microelectronics 2018, no. 1 (October 1, 2018): 000754–59. http://dx.doi.org/10.4071/2380-4505-2018.1.000754.

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Abstract In this paper, a low-cost fabrication technique using additive manufacturing (3D printing) is demonstrated for the fabrication of ultra-wide band (UWB) Vivaldi antennas. In communications, UWB antennas are required that have high gain and wide bandwidth (3.1 GHz to 10.6 GHz) enabling high-data rates and efficient use of frequency spectrum. 3D printing has evolved into an important technology that allows rapid and simple fabrication method for printing antennas, and other components. Two different Vivaldi antennas designs (i) Vivaldi with a slot line, and (ii) Corrugated Vivaldi are presented. The fabricated antennas have a wide bandwidth of 14 GHz and a high gain of 10 dBi. For example, the corrugated antenna exploits the capability of 3D printing to incorporate slots in the design that aids in low frequency matching with increased gain.

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Liu, C., A. Yan, C. Yu, and T. Xu. "Improvement on a 2 × 2 Elements High-Gain Circularly Polarized Antenna Array." International Journal of Antennas and Propagation 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/252717.

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Анотація:

A novel antipodal Vivaldi antenna with tapering serrated structure at the edges is proposed. Compared with traditional Vivaldi antennas without serrated structure, the gain of the designed antenna is significantly improved in the desired frequency band (4.5–7.5 GHz). In addition, a 2 × 2 Vivaldi antenna array with an orthorhombic structure is designed and fabricated to achieve a circular polarization (CP) characteristic. With this configuration, the 3 dB axial ratio bandwidth of the array reaches about 42% with respect to the center frequency of 6 GHz and a high gain is achieved as well. The novel Vivaldi antenna and CP antenna array both have ultrawide band (UWB) and high-gain characteristics, which may be applied to the field of commercial communication, remote sensing, and so forth.

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Більше джерел

Дисертації з теми "Antennes Vivaldi"

Linardou, Irini. "Antenne Vivaldi : potentialités d'applications en ondes millimétriques." Nice, 2000. http://www.theses.fr/2000NICE5455.

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Ce travail est consacré à la description de l'antenne Vivaldi et l'utilisation de celle-ci dans divers domaines d'applications, aux ressources spectrales du domaine millimétrique : les systèmes de surveillance radar embarqués et les systèmes de transmission à haut débit. Le premier chapitre repose sur la description et la caractérisation de l'antenne Vivaldi dont le concept repose sur la guidabilité du mode fondamental observé sur la microfente. Dans le deuxième chapitre, l'antenne Vivaldi est incluse dans un système de surveillance radar "monopulse" destiné à la détection et à la poursuite d'une cible mobile. Un réseau de deux antennes alimenté simultanément en phase et en opposition de phase doit générer les deux voies "somme" et "différence" utiles à la détection et à la poursuite. Deux architectures différentes sont proposées. Ces nouvelles architectures sont reprises au troisième chapitre dans une application différente de celle du radar "monopulse". Il s'agit d'une part de la conception d'un transpondeur à diversité de polarisation et d'autre part de celle d'un doubleur de fréquence. Dans le dernier chapitre, des antennes très larges bandes sont présentées, destinées aux applications "intra muros" et boucle radio locale.

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Le, Gouguec Thierry. "Contribution à la modélisation de la technologie uniplanaire : application à l'excitation d'un réseau bidimensionnel d'antennes de type "Vivaldi"." Brest, 1994. http://www.theses.fr/1994BRES2034.

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LA these presente une premiere etude des technologies uniplanaires dans le but de demontrer leur viabilite dans des applications de type communications par satellites. Le premier chapitre est consacre a la modelisation de l'antenne a rayonnement longitudinal de faible longueur. Un modele theorique proche de la configuration pratique est defini. Le probleme revient alors a l'etude d'une discontinuite en guide ouvert par une methode de raccordement de champs. Ayant defini d'une part, le coefficient de reflexion de la discontinuite et d'autre part, le couplage des modes guides aux modes continus, on peut alors en deduire l'impedance d'entree de l'antenne ainsi que son diagramme de rayonnement. La comparaison theorie-experience valide cette approche simple. Le second chapitre est consacre a la caracterisation de la technologie uniplanaire. Des modeles theoriques simples sont proposes pour les lignes de transmission et les principales discontinuites afin de pouvoir utiliser les logiciels de cao commerciaux. Une methodologie de developpement des dispositifs est proposee et testee sur le cas de transitions coplanaire-microfentes large bande. L'ensemble des resultats obtenus est valide par l'experience. Enfin dans la 3eme partie nous presentons l'etude de l'excitation d'une antenne reseau large bande utilisant les technologies precedemment definies. Un reseau bidimensionnel (4x4) est construit et teste montrant la viabilite des technologies uniplanaires dans ce contexte. Une etude specifique sur les filtres et multiplexeurs associes directement realises sur le meme substrat que les antennes vient renforcer cette conclusion.

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Thévenard, Julian. "Contribution à la conception à bas coût d'antennes 3D reconfigurables : solutions originales d'intégration en technologie plastique pour les systèmes sans fil du futur." Brest, 2008. http://www.theses.fr/2008BRES2011.

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Cette thèse a été consacrée à la conception d'antennes volumiques reconfigurables pour les produits sans fils du futur. Ces recherches ont été motivées par la tendance actuelle conduisant à une centralisation des services au sein des réseaux locaux sans fil et une miniaturisation des dispositifs. Ceci se traduit par une contrainte d'encombrement pour les antennes qui se doivent également d'apporter des solutions aux problèmes d'affaiblissements dus aux trajets multiples et aux interférences tout en améliorant les capacités (portée, qualité, consommation) du dispositif. Nous présentons ainsi une solution d'antenne multi-secteurs associant plusieurs antennes Vivaldi en réponse aux problèmes de l'application visée à savoir un système embarqué de type caméra haute définition sans fil. Après une étude théorique de l'antenne Vivaldi, un nouveau concept d'antenne multi-secteurs a été introduit et validé. La nécessité d'une réalisation industrielle à grande échelle et à bas coût de formes complexes nous a conduit vers la technologie plastique métallisé pour fabriquer l'antenne. Un système original de report sans soudure a ainsi été développé pour intégrer l'antenne en plastique au reste du système. La caractérisation d'un prototype a permis de valider l'utilisation du plastique pour ce genre d'applications. Cette antenne a ensuite été intégrée à une caméra sans fil puis recouverte d'un radôme protecteur qui permet d'améliorer les performances. Cette intégration simplifiée associée au contrôle des performances et à la flexibilité de l'antenne permet d'envisager des utilisations dans des applications aussi diverses que les réseaux domestiques ou maillés, ou pour la technologie MIMO
This thesis is dedicated to the design of 3D smart antennas for forthcoming wireless devices. Our research work has been motivated by the actual wireless trends leading to service concentration within WLAN and device miniaturisation. Thus, antenna design is nowadays guided by size constraints and their capacity to deal with fading interference, wireless environments while improving the performances of devices in terms of communication quality, power consumption. This thesis presents a multi-sector antenna solution associating many Vivaldi-antennas to provide a solution for the targeted application which is an embedded system constituting of high definition wireless cameras. A theoretical analysis of the Vivaldi antenna is first performed and then a novel concept of multi-sector antenna has been introduced and validated. Then, in order to target consumer market and to reduce the manufacturing costs in high volume production, the metallized molded plastic technology which enables molding 3D complex structures has been retained. An original without-welding transfer system has been developed for integrating the antenna to the rest of the system. The characterization of a prototype has resulted in the validation of the use of plastics for such applications. This antenna has been integrated in a wireless camera ; a protective radome having as additional property to improve the overall performances of the device is finally designed. This simplified integration procedure associated to a monitoring of the performances and the flexibility of the system makes it a good candidate for various applications like domestic WLAN, mesh networks or for MIMO technology

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Alaoui, abdallaoui Ismail. "Contribution à l'analyse CEM globale de structures et de circuits. Application aux antennes Vivaldi en présence d'un système non linéaire pour la récupération d'énergie : une approche FDTD." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC213/document.

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Les systèmes électroniques sont au cœur de notre vie quotidienne, ils sont intégrés dans la plupart des objets que nous utilisons chaque jour, et dans des secteurs clés comme l’aéronautique, l’automobile, le spatial, l’électronique grand public... Les techniques d’alimentation classiques (pile ou batterie) restent difficiles à envisager dans certaines applications car, elles sont limitées en autonomie, elles nécessitent des remplacements périodiques et leur recyclage est coûteux. Afin de détourner ces contraintes, le concept de la transmission d’énergie sans fil se présente comme une alternative aux systèmes d’alimentation classiques. La récupération d'énergie électromagnétique a beaucoup attiré l'attention puisque la puissance RF est largement diffusée à partir de nombreuses ressources électromagnétiques fiables. De plus, les circuits électroniques et notamment microondes deviennent de plus en plus rapides à cause des fréquences de travail de plus en plus élevées. L’analyse fréquentielle seule ne peut répondre à un certain nombre d’interrogations dans ces circuits. Une analyse purement temporelle devient nécessaire pour résoudre et répondre à toutes les problématiques. Parmi les problèmes posés dans les circuits microondes, on s’intéresse à deux approches totalement complémentaires:• L’Intégrité du Signal qui représente le dysfonctionnement des circuits du à la distorsion des signaux. • La Compatibilité ElectroMagnétique qui est le résultat de l’encombrement des composants électroniques dans les circuits. La première approche se base sur les modèles de composants et peut prédire parfaitement la qualité des signaux pendant le placement et le routage des cartes électroniques. En revanche, il sera très difficile de mettre en évidence les causes du comportement anormal du circuit en question. La deuxième approche complémentaire de la première, et qui est l’analyse par la compatibilité électromagnétique permettra de couvrir les causes du problème tels que diaphonie (Cross Talk), rayonnement et susceptibilité des systèmes dans le but de corriger le circuit pour qu’il fonctionne correctement.La méthode de travail adoptée dans cette thèse consiste dans un premier temps à identifier les différents problèmes. Ensuite proposer des solutions via des codes de calcul existants (FDTD, FEM, MoM…) et qu’on pourra développer (2D) ou bien via des logiciels adaptés tels que Spice, Matlab, EMPro, ADS…..etc
Electronic systems are integrated into most objects that we use every day, also in different key sectors such as, automotive, railway, spacial, defense and consumer electronics... Conventional feeding techniques remain difficult to envisage in certain applications because they are limited in their autonomy energy, and they require periodic replacements and their recycling is expensive. In this mind, the wireless power transfer is a very interesting solution, less expensive and aesthetic. This solution needs to pick up the RF power transmitted through the free space by a Rectenna and convert it to a DC voltage, to feed one or several wireless devices or to increase the operating life of batteries.The high operating frequencies makes the microwave circuits faster. Frequency analysis can’t answer a number of questions in these circuits. The introduction of the temporal analysis becomes necessary to solve and answer all the problems encountered. In fact, we are interested in two complementary approaches:• Signal integrity, which represents the malfunction of the circuits due to the distortion of the signals• ElectroMagnetic Compatibility, which is the result of the congestion of the electronic components in the circuits.• The first approach is based on component models and can perfectly predict signal quality during placement and routing of electronic boards. On the other hand, it will be difficult to highlight the causes of the abnormal behavior of the circuit. The second approach, is complementary of the first one, which is the analysis by the electromagnetic compatibility, who will allow to cover the causes of the problems such as cross talk, radiation and defined the susceptibility of this systems to work correctly.The working method adopted in this thesis consists in first identifying the various problems. Then propose solutions via existing calculation codes (FDTD, FEM, MoM ...) who can be developed or via the software such as Spice, Matlab, EMPro, ADS …Key words: Wireless power transfer, UWB systems, numerical methods, Rectenna systems, RF/DC converter, EMC analysis

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Hijazi, Hadi. "Ultra-wideband antenna systems for in-band full-duplex applications." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0011.

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Анотація:

La technologie in-band full-duplex a pour objectif d’augmenter l'efficacité spectrale des liaisons sans-fils en permettant à deux systèmes de communiquer simultanément dans la même bande de fréquence. Dans cette configuration in-band full-duplex, le principal défi consiste à annuler ou réduire les signaux d’auto-interférence, qui se couplent de l'émetteur vers son propre récepteur. Divers circuits d'annulation d'auto-interférence peuvent alors être mis en oeuvre : au niveau de l’antenne, de l'étage analogique et/ou numérique. Les techniques classiques d'annulation d'auto-interférence sont majoritairement dédiées aux systèmes à bande étroite et peu de travaux ont été menés pour étendre leurs performances à un fonctionnement en large-bande et encore moins en ultra-large-bande. Dans ce travail, nous nous focalisons sur l'étude des techniques d'annulation compatibles avec un fonctionnement ultra-large-bande et sur leurs mises en oeuvre. Les systèmes antennaires proposés sont basés sur une technique d'annulation en champ proche qui utilise quatre antennes et deux baluns. Les avantages des systèmes développés sont multiples, ils proposent tous une bande passante extrêmement large tout en maintenant un niveau d'annulation d'auto-interférence au moins supérieur à 55-60 dB sur cette bande avec des configurations permettant soit d'en augmenter la solidité mécanique, soit d'obtenir une double polarisation ou encore avec une alimentation innovante des antennes
In-band full-duplex technology aims to mitigate the scarcity of spectral resources by allowing two radios to communicate simultaneously in the same frequency band. The main challenge for full-duplex radios is to cancel the self-interference signals, which couple from the transmitter of one radio to its own receiver, by implementing various self-interference cancellation circuitry at the antenna, analog, and digital stages of the radio front-end. Conventional self-interference cancellation techniques were dedicated for narrowband systems and little work has been conducted to extend their performance for wideband operation. Thus, in this work, we focus on studying the wideband potential of the available cancellation techniques and implementing wideband full-duplex systems based on those techniques. The implemented systems are based on the near-field cancellation technique which uses four antennas and two baluns. The systems' merits vary from extremely wide bandwidth to higher mechanical solidity and dual-polarization, but they all can maintain a decent amount of cancellation

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Ludlow, P. "Tuneable evanescent waveguide and Vivaldi antennas." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557663.

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Анотація:

In this thesis, we have investigated antenna elements that allow broadband operation and are relatively compact, while determining methods by which their geometry may be adapted, or various points in their structure loaded, in order to form reconfigurable antennas that may allow their polarisation or matching characteristics to be electronically altered. Much of the work undertaken has involved evanescent open-ended waveguide antennas, whereby the waveguide is operated below its cutoff frequency. Various novel matching methods have been developed, involving: (i) Using the Imaginary Smith Chart to design a match to the aperture admittance of an open-ended wave guide, and thereby to free space, with the match made reconfigurable through loading of the structure using a varactor diode. (ii) Use of capacitive coupling between an open-ended waveguide antenna's coaxial input feed and capacitive obstacles placed across the aperture of the antenna to obtain a broadband match, with polarisation-agile performance possible through varying the ex citations supplied at the input ports of the antenna. (iii) Application of band-pass filter techniques to design a match to the aperture admittance of an open-ended waveguide, through the use of alternating propagating/evanescent sections or by loading the antenna with capacitive obstacles. Radar cross-section reconfigurability is demonstrated, through a printed obstacle with switch implemented at the aperture of the waveguide. The Vivaldi antenna has also been the subject of investigation in the project, with the most notable result obtained being the design of an antipodal Vivaldi antenna loaded by shorted slotline stubs that have a variable capacitor placed across them; this allows wideband operation but with a tuneable rejection band, which enables rejection of cellular and ISM bands.

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Oliveira, Alexandre Maniçoba de. "Desenvolvimento e otimização de antenas Vivaldi antipodais para aplicações a altas frequências." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-21062016-145910/.

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Анотація:

Esta tese propõe a síntese e o estudo de uma nova técnica de cavidades de borda aplicada a antenas Vivaldi, com o intuito de melhorar suas características de diretividade. Embora as antenas do tipo Vivaldi possuam características diretivas, elas produzem radiações laterais indesejáveis, o que se reflete nos elevados índices de lóbulos laterais devido a correntes superficiais que fluem ao longo das bordas metalizadas nas laterais da antena. Estas correntes são a origem das radiações laterais que vêm sendo mitigadas pela aplicação de cavidades ressonantes, triangulares ou retangulares, que aprisionam tais correntes e, consequentemente, atenuam os lóbulos laterais, sem o incremento do lóbulo principal, uma vez que toda a energia dos lóbulos laterais é apenas confinada nos ressonadores e por isso literalmente perdida. Ao contrário desses esforços, este trabalho propõe cavidades radiantes tanto na forma de abertura exponencial, como na forma do fractais de Koch, que funcionam como radiadores auxiliares (antenas auxiliares), canalizando as correntes de borda e aproveitando-as para aumentar os níveis do lóbulo principal, mitigando os níveis de lóbulo lateral. A síntese desta nova técnica foi implementada em uma antena Vivaldi antipodal com características de baixa diretividade, como qualquer antena Vivaldi, o que foi corrigido e a aplicação da técnica de cavidades radiantes deu origem a duas novas antenas Vivaldis efetivamente diretivas. Os resultados foram obtidos através de simulações do modelo numérico no CST Microwave Studio e confirmados com medidas de laboratório, o que evidenciou a melhora das características de diretividade da antena pela aplicação da nova técnica de cavidades radiantes.
This work presents a new Slot Edge technique applied to Vivaldi antennas to improve their characteristics of directivity, resulting in two new Vivaldi antennas: the Palm Tree Vivaldi antenna and the Koch Vivaldi antenna. This new technique proposes to add lateral radiators which reduce the side lobe level, increasing the gain of the main lobe in an unprecedented way. This technique is called radiating slot edges, and acts as parasitic antennas, surface currents draining edges of the antenna, and using them to increase the gain in the main lobe. The development was done systematically, starting with an extensive literature review, design and simulation in CST, as well as prototyping and measurements of several antenna designs. All this effort proved the functionality of this technique.

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Erdogan, Yakup. "Parametric Study And Design Of Vivaldi Antennas And Arrays." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610492/index.pdf.

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Анотація:

In this thesis, parametric study and design of Vivaldi antennas and arrays are studied. The parameters of single element antennas and arrays are investigated regarding their effects on the design. The return loss responses and radiation patterns are considered in the parametric study. The results of simulations realized using Ansoft HFSS, a high frequency electromagnetic field simulation program, are shown and discussed. Two different Vivaldi antennas operating in 8.5-10.5 GHz frequency band with return loss responses better than 15 dB are designed based on the results of parametric study. Stripline to slotline transition is used in the feeding section of both antennas. In the same manner, two different 8-element uniform linear arrays operating in 8.5-10.5 GHz with half power beam widths smaller than 12&
#730
and side lobe levels smaller than 13 dB are designed. Binomial and Dolph-Chebyshev feeding techniques are also investigated in order to improve half power beamwidths and side lobe levels of the designed arrays. The designed single element Vivaldi antennas and a linear array of Vivaldi antennas are fabricated. The return loss response and radiation patterns of the fabricated antennas and the array are measured and compared with the simulation results.

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Nassar, Ibrahim. "Long-Range, Passive Wireless Monitoring Using Energy-Efficient, Electrically-Small Sensor Nodes and Harmonic Radar Interrogator." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4923.

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This dissertation investigates the use of the harmonic radar technique for passive wireless sensing applications. Issues of DC power consumption, high RF activation power, large node size, and short communication range associated with the existing passive wireless sensing technologies are addressed by the development of novel, completely passive, high efficiency, compact 3-D harmonic sensor nodes. The node transceiver employs a passive frequency doubler to return the second harmonic of the interrogation signal, and electrically-small 3-D antennas to achieve the compactness and high efficiency. The developed nodes fit inside a sphere with a diameter < 3 cm and achieve communication range > 60 m using a 43 dBm EIRP interrogator. Effective modulation is demonstrated experimentally using low cost commercial vibration sensors. To address major challenges associated with long-range, embedded, passive wireless sensing including sensor node identification and remote channel calibration, a 3-D dual-channel transceiver is developed. To the best of the author's knowledge, the presented dual-channel transceiver is the first completely passive design with built-in passive remote channel calibration and identification capabilities, and the presented nodes have the best overall performance among previously published designs, in terms of conversion efficiency, communication range, and occupied volume. To reduce the cost and weight and improve the manufacturing process of the proposed nodes, the 3-D digital additive manufacturing and conformal direct printing technologies are employed. The harmonic interrogator antenna design is also an underlying focus of this work. Different interrogator antenna candidates are developed based on different design approaches. The first approach is based on the use of dual-channel antenna array, where one channel is used for transmission and the second channel is used for reception. Two dual-channel harmonic interrogator antennas that consist of 4-element circular patch antenna arrays and 2-element quasi-Yagi dipole antenna arrays are implemented. The second approach employs mechanically reconfigurable antennas to reduce the size and maintain persistent radiation properties over wide frequency bandwidth. Two mechanical reconfiguration methods are developed; the first method is based on the use of Hoberman's planar foldable linkage to vary the operating frequency of planar circular patch antennas and the second mechanical reconfiguration method is based on the use of a rack and pinion mechanism to reconfigure dual-band slot antennas. The third approach employs a single channel multi-octave Vivaldi antenna to provide the capability to interrogate a large number of harmonic tags that are widely spaced in frequency. To improve the antenna radiation performance over a broad frequency range, a new method based on the introduction of a parasitic elliptical patch in the flare aperture is proposed. This method enables gain and bandwidth improvement compared to what has been reported for Vivaldi antennas with a compact size. To provide the interrogator the capability to steer the radiation beam for locating and tracking sensor nodes, a topology to develop a miniature, non-dispersive switchable 4-bit phase shifter is proposed on the basis of composite right/left handed transmission line unit cells.

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Javashvili, Otar. "UWB Antennas for Wall Penetrating Radar Systems." Thesis, University of Gävle, University of Gävle, University of Gävle, Center for RF Measurement Technologies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-5509.

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Анотація:

Basic properties and new design principles of ultra wideband Vivaldi antennas are presentedand discussed in this paper. The focus will be on the modeling of Vivaldi antenna design curves, by which it is constructed; its simulation results, realization and the measurements.

According to the aim of this research the discussion starts with the review of the previous researches done for Vivaldi antennas. Introductory part of the report also contains the problem description for the current project and the classification of the goals to be achieved. As a theoretical review, the discussion initiates with the definitions anddescription of basic parameters of the antennas and covers a short presentation of UWBpulse-based radar system. The attention will be focused on UWB signals behavior and characterization, their propagation principles and basic troubles stands nowadays. As anapplication the wall penetrating Radar systems will be considered. The major part of thereport holds on the investigation of the design principles of Vivaldi Antenna andoptimization of the key parameters for achieving the best performance for radar. Theending part of the report shows the simulations and measurement results and theircomparisons following with conclusions/discussions.

The report will be supportive for the antenna designers, who work for UWB systems andparticularly for Vivaldi antennas, as long as there are showing up detailed descriptions ofVivaldi antenna characteristics depending on its shape and substrate properties. The modelfor designing Vivaldi antennas, given in this project, can successfully be applied for almostall the cases used in practice nowadays.

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Книги з теми "Antennes Vivaldi"

Moosazadeh, Mahdi. Antipodal Vivaldi Antennas for Microwave Imaging of Construction Materials and Structures. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05566-0.

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Simons, Rainee. Characterization of miniature millimeter-wave vivaldi antenna for local multipoint distribution service. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Simons, Rainee. Characterization of miniature millimeter-wave vivaldi antenna for local multipoint distribution service. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Moosazadeh, Mahdi. Antipodal Vivaldi Antennas for Microwave Imaging of Construction Materials and Structures. Springer, 2019.

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Частини книг з теми "Antennes Vivaldi"

Mohapatra, Sasmita. "Antipodal Vivaldi Antennas Arranged in Circular Array for RADAR." In Smart Antennas, 405–14. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76636-8_30.

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Saleh, Sahar, Widad Ismail, Intan Sorfina Zainal Abidin, Mohd Haizal Jamaluddin, Mohammed Bataineh, and Asem Alzoubi. "Simple Compact UWB Vivaldi Antenna." In Lecture Notes in Electrical Engineering, 13–19. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8129-5_3.

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Liu, Chang, Chenjiang Guo, and Haobin Zhang. "Design of Wideband Vivaldi Antenna Array." In Lecture Notes in Electrical Engineering, 189–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19706-2_25.

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Qing, X., and Z. N. Chen. "Antipodal Vivaldi Antenna for UWB Applications." In Ultra-Wideband, Short-Pulse Electromagnetics 7, 354–62. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-37731-5_39.

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Fang, Xiao, Mehrab Ramzan, Qiong Wang, and Dirk Plettemeier. "Compact Antipodal Vivaldi Antennas for Body Area Communication." In Internet of Things, 357–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02819-0_27.

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Lalitha, K. "Ultra-Wideband Wearable Vivaldi Antennas for Biomedical Applications." In Microstrip Antenna Design for Wireless Applications, 283–89. New York: CRC Press, 2021. http://dx.doi.org/10.1201/9781003093558-26.

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Kumari, Chanchala, and Neela Chattoraj. "Wide Band Vivaldi Antenna Design by Using SIW." In Lecture Notes in Electrical Engineering, 423–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0275-7_35.

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Jagdale, Akshta, H. Sairaam, Harshita Kulkarni, Lakshmi Suresh Nair, and Sanjeev Kumar. "An Ellipse Slotted Vivaldi Antenna for 5G Applications." In ICT Analysis and Applications, 769–76. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5655-2_74.

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Ameen, Jalal J. Hamad. "Design and Simulation of Multi-band M-shaped Vivaldi Antenna." In Advances in Intelligent Systems and Computing, 903–12. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76348-4_86.

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Guo, Xingchen, Jing Shen, and Zhi Xu. "Novel Slots Synthesis Design for the Harmonic Suppression of Vivaldi Antenna." In Wireless Communications, Networking and Applications, 717–27. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2580-5_64.

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Тези доповідей конференцій з теми "Antennes Vivaldi"

Naydenko, Victor, and Maxim Kozachuk. "Vivaldi Coplanar-Antipodal Antennas." In 2020 IEEE Ukrainian Microwave Week (UkrMW). IEEE, 2020. http://dx.doi.org/10.1109/ukrmw49653.2020.9252807.

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Hamid, M. R., P. Gardner, P. S. Hall, and F. Ghanem. "Review of reconfigurable vivaldi antennas." In 2010 IEEE International Symposium Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting. IEEE, 2010. http://dx.doi.org/10.1109/aps.2010.5562021.

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Presse, Anthony, Jean Marie Floc'h, Anne-Claude Tarot, and Christophe Camus. "Bent antipodal Vivaldi antenna." In 2014 8th European Conference on Antennas and Propagation (EuCAP). IEEE, 2014. http://dx.doi.org/10.1109/eucap.2014.6902425.

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Du, Jiachen, Qingfeng Zhang, Amir Khurrum Rasahid, and Xia Fen. "A Uniplanar Vivaldi Antenna." In 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2019. http://dx.doi.org/10.1109/icmmt45702.2019.8992376.

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Ren, Jinjing, Zhongyuan Yu, and Qi Tang. "Wide-beam Vivaldi Antenna." In 2021 Photonics & Electromagnetics Research Symposium (PIERS). IEEE, 2021. http://dx.doi.org/10.1109/piers53385.2021.9695032.

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Presse, Anthony, Jean Marie Floc'h, Anne-Claude Tarot, and Christophe Camus. "Broadband UHF flexible vivaldi antenna." In 2013 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2013. http://dx.doi.org/10.1109/lapc.2013.6711900.

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Sharp, A. N., and R. Kyprianou. "Vivaldi antennas: wideband radar antennas simulation and reality." In IET International Conference on Radar Systems 2007. IEE, 2007. http://dx.doi.org/10.1049/cp:20070607.

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Rana, Md Masud, Reshma Khanom, and Md Mostafizur Rahman. "Design and Analysis of Vivaldi Antennas." In 2018 International Conference on Innovation in Engineering and Technology (ICIET). IEEE, 2018. http://dx.doi.org/10.1109/ciet.2018.8660793.

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Bankov, S. E., A. G. Davydov, G. E. Kariukin, A. A. Kurushin, and K. B. Papilov. "Wide angle scanning Vivaldi antennas array." In 2014 24th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo). IEEE, 2014. http://dx.doi.org/10.1109/crmico.2014.6959472.

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Schaubert, D. H., W. Elsallal, S. Kasturi, A. O. Boryssenko, M. N. Vouvakis, and G. Paraschos. "Wide bandwidth arrays of Vivaldi antennas." In IET Seminar on Wideband, Multiband Antennas and Arrays for Defence or Civil Applications. IEE, 2008. http://dx.doi.org/10.1049/ic:20080084.

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