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Journal articles on the topic 'The radiation pattern'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Zavgorodnii, A. S., V. L. Voronov, I. V. Ryabov, and A. A. Chigvincev. "The results of navigation spacecrafts observations with asymmetry of the onboard antenna amplitude radiation pattern." Izmeritel`naya Tekhnika, no. 7 (August 31, 2023): 55–59. http://dx.doi.org/10.32446/0368-1025it.2023-7-55-59.

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The received in the Earth surface layer satellite radio signal power depends on the space navigation vehicle onboard antenna parameters, primarily it depends on the amplitude radiation pattern shape. The spacecraft onboard antenna radiation pattern has a complex shape in order to compensate for radio navigation signal power changes as a result of the removal (or approach) of the navigation satellite from the signal consumer. For this reason, the shape of the radiation pattern must have axial symmetry, i.e. it has to be close to the rotation fi gure. As a result of the global navigation satelli

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Ellefsen, Karl J., and David L. Wright. "Radiation pattern of a borehole radar antenna." GEOPHYSICS 70, no. 1 (2005): K1—K11. http://dx.doi.org/10.1190/1.1852779.

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The finite-difference time-domain method was used to simulate radar waves that were generated by a transmitting antenna inside a borehole. The simulations were of four different models that included features such as a water-filled borehole and an antenna with resistive loading. For each model, radiation patterns for the far-field region were calculated. The radiation patterns show that the amplitude of the radar wave was strongly affected by its frequency, the water-filled borehole, the resistive loading of the antenna, and the external metal parts of the antenna (e.g., the cable head and the

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3

Núñez, José, Pedro Orgeira-Crespo, Carlos Ulloa, and Inés García-Tuñón. "Analysis of the operating conditions for UAV-based on-board antenna radiation pattern measurement systems." PLOS ONE 16, no. 2 (2021): e0245004. http://dx.doi.org/10.1371/journal.pone.0245004.

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Communications, navigation, and other related systems need to have a well-defined antenna radiation pattern. In onboard vessel systems, the radiation pattern can be much different than the one obtained for an isolated antenna (because of the vessel’s structure and other nearby radiating systems interference). Finding out the onboard antenna’s radiation pattern is a well-known problem for any shipbuilder/owner. The conventional method consists of measuring radiation patterns from a fixed antenna on the coast while the ship is navigating in circles. Recent electronic systems in the market now al

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Rusov, Yu S., and A. A. Propastin. "Odd Mathieu Functions Application to Synthesize a Multi-element Radiator Flat-topped Radiation Pattern." Radio Engineering, no. 3 (November 9, 2021): 1–12. http://dx.doi.org/10.36027/rdeng.0321.0000194.

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The paper studies synthesizing capabilities of a flat-topped radiation pattern when using the expansion of the target radiation pattern into a series in terms of odd Mathieu functions. As parameters for comparing the target and synthesized radiation patterns, we used a main-lobe width at a level of -1 dB and an irregularity of the top of the main-lobe of the radiation pattern. The sector-shaped radiation pattern has been synthesized for linear radiators of various lengths. The convergence of the coefficients of the Mathieu series in the synthesis of the sector-shaped radiation pattern has been

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Celis, Sebastian, Mohamed Farhat, Li Zhang, Hakan Bagci, Ahmed M. Eltawil, and Khaled N. Salama. "On Coding and Decoding Reconfigurable Radiation Pattern Modulation Symbols." Electronics 10, no. 5 (2021): 614. http://dx.doi.org/10.3390/electronics10050614.

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In this paper, we propose the theoretical framework for a reconfigurable radiation pattern modulation (RRPM) scheme, which is reminiscent of the index modulation technique. In the proposed scheme, information is encoded using far-field radiation patterns generated by a set of programmable radiating elements. A considerable effort has been invested to allow for high transmission of the reconfigurable radiation pattern symbols; yet, the receiving system has received little attention and has always been considered ideal. Depending on the number of receivers and their respective positions, two var

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Mohammad Mahdi Taskhiri, Mohammad Mahdi Taskhiri, and Mohammad Khalaj-Amirhosseini Mohammad Khalaj-Amirhosseini. "Inhomogeneous lens antenna design with fan-beam radiation pattern." Chinese Optics Letters 14, no. 12 (2016): 121601–5. http://dx.doi.org/10.3788/col201614.121601.

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Krchnák, Jakub, Michal Dzuriš, René Harťanský, Ján Halgoš, Anatolii Kliuchka, and Michal Štibraný. "Investigating the sufficient measurement distance for a UAV-performed VHF/UHF radiation pattern measurements." Acta IMEKO 14, no. 2 (2025): 1–11. https://doi.org/10.21014/actaimeko.v14i2.2066.

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The transmission of radio signals in VHF and UHF frequency bands is facilitated by large antenna systems situated at high altitudes and considerable heights above the ground. To determine the functionality of such systems, a crucial procedure is radiation pattern measurement, especially before and after replacing old antennas with new ones. Advancements in drone technology offer a possibility of employing semi-autonomous drones to perform the radiation pattern measurement, providing a high measurement flexibility. Due to the broad spectrum of capabilities offered by drones, compared to the pre

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8

Chick, Geoffrey C., and Dewey L. Potter. "ACOUSTIC RADIATION PATTERN ADJUSTING." Journal of the Acoustical Society of America 133, no. 4 (2013): 2510. http://dx.doi.org/10.1121/1.4800095.

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9

Delphine, Abijuru, R. Hamid M., and N. Obadiah Ali. "Improved Vivaldi Antenna with Radiation Pattern Control Features." TELKOMNIKA Telecommunication, Computing, Electronics and Control 16, no. 3 (2018): 1143–49. https://doi.org/10.12928/TELKOMNIKA.v16i3.9039.

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Vivaldi antenna has been considered as a mitigation to the scattering effect of an antenna. However, the current performance of Vivaldi antenna suffers from multipath effect, interfering signals and radiation pattern control. This paper proposed an improved Vivaldi antenna which combined triple radiating slot to enable control of radiation pattern features. This is accomplished by controlling the position of the radiating element through the asymmetric arrangement of ideal switches to steer the beam in three desired-directions. The Using operating frequency lied between 900 MHz and 2.5GHz, the

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10

Khan, Taimur Ahmed, Muhammad Irfan Khattak, Abdul Basit, Salman A. AlQahtani, Abdulaziz M. Alawwad, and Abdullilah A. Alotaibi. "Radiation Pattern Synthesis Using Constraint Convex Optimization Algorithm for Conformal Antenna Array." Applied Sciences 13, no. 21 (2023): 11633. http://dx.doi.org/10.3390/app132111633.

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In this paper, a model based on constraint convex optimization is proposed for the radiation pattern synthesis in cylindrical and spherical microstrip conformal array antennas. The optimization algorithm is modeled to decrease the Euclidean distance between the obtained radiation pattern of the deformed array and the desired radiation pattern of the planar array by calculating the suitable amplitude and phase values for the individual array patches. Four prototypes of 2×2, 3×3, 4×4, and 5×5 microstrip patch array antenna are used as the radiating elements which are deformed from planar arrange

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Stroud, James T., and Jonathan B. Losos. "Bridging the Process-Pattern Divide to Understand the Origins and Early Stages of Adaptive Radiation: A Review of Approaches With Insights From Studies of Anolis Lizards." Journal of Heredity 111, no. 1 (2019): 33–42. http://dx.doi.org/10.1093/jhered/esz055.

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Abstract Understanding the origins and early stages of diversification is one of the most elusive tasks in adaptive radiation research. Classical approaches, which aim to infer past processes from present-day patterns of biological diversity, are fraught with difficulties and assumptions. An alternative approach has been to study young clades of relatively few species, which may represent the putative early stages of adaptive radiation. However, it is difficult to predict whether those groups will ever reach the ecological and morphological disparity observed in the sorts of clades usually ref

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12

Boopalan, Navaamsini, Agileswari K. Ramasamy, Farrukh Nagi, and Ammar Ahmed Alkahtani. "Planar Array Failed Element(s) Radiation Pattern Correction: A Comparison." Applied Sciences 11, no. 19 (2021): 9234. http://dx.doi.org/10.3390/app11199234.

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Phased arrays are widely used in different fields, such as broadcasting, radar, optics, and space communications. The principle of phased arrays is to generate a directed signal from a large number of antennas to be steered at any desired angle. This, however, increases the probability of defective elements in an array. Faulty elements in an array cause asymmetry and result in increased sidelobe levels which rigorously distort the radiation pattern. Increased sidelobe radiation wastes energy and can cause interference by radiating and receiving signals in unintended directions. Therefore, it i

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13

Ishizaki, Yasuhiro, Hideo Shiogama, Seita Emori, et al. "Dependence of Precipitation Scaling Patterns on Emission Scenarios for Representative Concentration Pathways." Journal of Climate 26, no. 22 (2013): 8868–79. http://dx.doi.org/10.1175/jcli-d-12-00540.1.

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Abstract Pattern scaling is an efficient way to generate projections of regional climate change for various emission scenarios. This approach assumes that the spatial pattern of changes per degree of global warming (scaling pattern) is the same among emission scenarios. The hypothesis was tested for the scaling pattern of precipitation by focusing on the scenario dependence of aerosol scaling patterns. The scenario dependence of aerosol scaling patterns induced the scenario dependence of the surface shortwave radiation scaling pattern. The scenario dependence of the surface shortwave radiation

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14

Mo, Jungmin, and Youngje Sung. "Dual-Band Antenna with Pattern and Polarization Diversity." Sensors 24, no. 15 (2024): 5008. http://dx.doi.org/10.3390/s24155008.

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This study proposes a pattern–diversity antenna with different radiation patterns at two different frequency bands (f1 and f2; f1: broadside radiation pattern, f2: conical radiation pattern). The proposed structure consists of a central circular antenna and two annular ring antennas, with each of the antennas having individual ports. Two of the ports (port 1 and port 3) exhibit orthogonal broadside radiation patterns at low bands, and the other two ports (port 1 and port 2) exhibit orthogonal conical radiation patterns at high bands. Thus, they have polarization diversity characteristics. To i

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15

Aho-Mantila, L., F. Subba, M. Bernert, et al. "Predictions of radiation pattern and in–out asymmetries in the DEMO scrape-off layer using fluid neutrals." Nuclear Fusion 62, no. 5 (2022): 056015. http://dx.doi.org/10.1088/1741-4326/ac4d62.

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Abstract Strongly radiating and detached high-power discharges in present-day full-metal tokamaks have a characteristic radiation pattern involving condensation of radiation near the X-point, with significant radiative losses above the X-point. In contrast, Demonstration Fusion Power Plant (DEMO) divertor exhaust scoping studies using reduced physics models, including a fluid description for the neutrals, place the strongest radiation fronts in the divertor legs, near the separatrix. The present contribution studies sensitivity of the radiation pattern corresponding to maximal divertor impurit

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Wu, Haotian, Guo Dong Bai, Shuo Liu, et al. "Information theory of metasurfaces." National Science Review 7, no. 3 (2019): 561–71. http://dx.doi.org/10.1093/nsr/nwz195.

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Abstract We propose a theory to characterize the information and information processing abilities of metasurfaces, and demonstrate the relation between the information of the metasurface and its radiation pattern in the far-field region. By incorporating a general aperture model with uncertainty relation in L2-space, we propose a theory to predict the upper bound of information contained in the radiation pattern of a metasurface, and reveal the theoretical upper limit of orthogonal radiation states. The proposed theory also provides guidance for inverse design of the metasurface with respect t

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17

Annas, Muhamad Azwar, Aris Widodo, Uswatun Chasanah, Muktamar Cholifah Aisiyah, and Izza Eka Ningrum. "Pola Radiasi Antena Patch dalam Skala Linier." YASIN 2, no. 5 (2022): 705–18. http://dx.doi.org/10.58578/yasin.v2i5.895.

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An antenna radiation pattern experiment has been carried out with the aim of determining the patch antenna radiation pattern on a logarithmic and linear scale, understanding the properties and principles of the antenna, and understanding the types of antenna radiation patterns. In the experiment, the angle, frequency, and radian intensity data were obtained, and the value of the linear intensity was calculated. With the principle of converting electrical signals into electromagnetic signals. a graph between angle and intensity is obtained. the graph between radian intensity and angle forms a c

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18

B. Saleem, R. A., A. A. Shah, H. Munsif, A. I. Najam, S. Khattak, and I. Ullah. "Radiation Pattern Correction of Faulty Planar Phased Array using Genetic Algorithm." Advanced Electromagnetics 13, no. 2 (2024): 23–31. http://dx.doi.org/10.7716/aem.v13i2.2439.

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The probability of antenna array failure or malfunctioning cannot be ruled out, and hardware replacement of faulty elements is not always a viable solution. Therefore, academic and industrial interest in self-healing phased arrays are on the rise. In this work, the phase-only genetic algorithm (GA) optimization flow for the radiation pattern correction of a 4 × 4 phase faulty planar antenna array is proposed. Initially, a reference array pattern at the desired scan angle is generated. Then random phase faults are introduced across the 1 × 4 antenna elements in any one of 4 sub-arrays to produc

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19

Zhang, Shiyuan, Chuan Shi, and Ming Bai. "A High-Efficient Method for Synthesizing Multiple Antenna Array Radiation Patterns Simultaneously Based on Convolutional Neural Network." International Journal of Antennas and Propagation 2023 (October 17, 2023): 1–6. http://dx.doi.org/10.1155/2023/6666997.

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This paper proposes a high-efficient method that utilizes deep learning technology for synthesizing multiple antenna array radiation patterns simultaneously. More in details, the mathematical feasibility of using neural networks to optimize and synthesize radiation patterns of antenna arrays is demonstrated. Boundary functions are designed to reshape the important characteristics of target radiation patterns and transform them into a two-channel mask matrix, allowing for the simultaneous input of multiple target radiation patterns into the neural network without sacrificing computational effic

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20

Pratik, Tawde*1 Servesh Gupta2 Shrinivas Paivernekar3 &. Pranjali Shelke4. "SIMULATION OF MICROSTRIP ANTENNA PHASED ARRAY USING UNIFORM AND BINOMIAL DISTRIBUTIONS AND SCHELKUNOFF'S POLYNOMIAL BASED ARRAY BEAM SYNTHESIS METHOD USING MATLAB." GLOBAL JOURNAL OF ADVANCED ENGINEERING TECHNOLOGIES AND SCIENCES 5, no. 4 (2018): 10–14. https://doi.org/10.5281/zenodo.1238610.

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Antennas with given radiation pattern may be arranged in a pattern (line, circle, plane etc.) to yield a different radiation pattern. An antenna array is a configuration of multiple antennas (elements) arranged to achieve the given radiation pattern. These arrays are classified as linear array, circular array, planar array etc. based on placement or an arrangement of these multiple elements in a specific geometrical shape. There are multiple design issues of the antenna array are available in the form of different variables such as, shape of the array, element spacing between array elements, e

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21

Gribanov, A. N., S. E. Gavrilova, A. E. Dorofeev, G. F. Moseychuk, and O. S. Alekseev. "A method for measuring dynamic radiation patterns of passive and active phased antenna arrays." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 4 (December 30, 2016): 32–40. http://dx.doi.org/10.38013/2542-0542-2016-4-32-40.

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The study deals with a method for measuring dynamic radiation patterns of phased antenna arrays and active phased antenna arrays. The method consists of measuring the signal during electronically scanning the beam of a static antenna. We show the main differences between dynamic and static radiation patterns. The Whittaker Nyquist – Kotelnikov – Shannon sampling theorem forms the basis of our recommendations for selecting the number of measurement points in the case of a dynamic radiation pattern. We supply a diagram of a work station dedicated to measuring dynamic radiation patterns using the

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22

Blázquez, Miguel, Rüdiger Ortiz-Álvarez, Francisco Gasulla, Israel Pérez-Vargas, and Sergio Pérez-Ortega. "Bacterial communities associated with an island radiation of lichen-forming fungi." PLOS ONE 19, no. 3 (2024): e0298599. http://dx.doi.org/10.1371/journal.pone.0298599.

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Evolutionary radiations are one of the most striking processes biologists have studied in islands. A radiation is often sparked by the appearance of ecological opportunity, which can originate in processes like trophic niche segregation or the evolution of key innovations. Another recently proposed mechanism is facilitation mediated by the bacterial communities associated with the radiating species. Here we explore the role of the bacterial communities in a radiation of lichen-forming fungi endemic to Macaronesia. Bacterial diversity was quantified by high throughput sequencing of the V1–V2 hy

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23

Vaquero, Álvaro F., and Juan Córcoles. "Convex Formulations for Antenna Array Pattern Optimization Through Linear, Quadratic, and Second-Order Cone Programming." Mathematics 13, no. 11 (2025): 1796. https://doi.org/10.3390/math13111796.

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This work presents a comprehensive study on formulations for the radiation pattern design of antenna arrays through convex optimization techniques, with a focus on linear, quadratic, and second-order cone programming. The proposed approaches heavily rely on the construction of Hermitian forms to systematically build convex optimization problems for synthesizing desired beam patterns while including practical constraints such as sidelobe levels (SLLs), maximum directivity, and null placement. By formulating the radiation pattern synthesis problem through a convex formulation, global optimality

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24

Lukin, K. A. "Scanning synthetic radiation pattern antennas." Radioelectronics and Communications Systems 53, no. 4 (2010): 219–24. http://dx.doi.org/10.3103/s0735272710040072.

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Bharath Gopalakrishnan, Jaya, Thennarasan Sabapathy, Muzammil Jusoh, et al. "Radiation Pattern Reconfigurable FM Antenna." Journal of Physics: Conference Series 1339 (December 2019): 012054. http://dx.doi.org/10.1088/1742-6596/1339/1/012054.

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26

Abromeit, C., and H. Trinkaus. "Radiation-Induced Microstructural Pattern Formation." Solid State Phenomena 23-24 (January 1992): 181–202. http://dx.doi.org/10.4028/www.scientific.net/ssp.23-24.181.

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Believ, E. I., V. V. Veremei, and V. P. Shestopalov. "Radiation pattern of resonant scatterers." Radiophysics and Quantum Electronics 30, no. 10 (1987): 881–86. http://dx.doi.org/10.1007/bf01034849.

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28

Saroja, K., and S. Sanyal. "Radiation Pattern of Parabolic Reflector." IETE Technical Review 16, no. 1 (1999): 33–37. http://dx.doi.org/10.1080/02564602.1999.11416800.

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Wu, Te-Kao. "Simulation of antenna radiation pattern." Microwave and Optical Technology Letters 8, no. 4 (1995): 204–6. http://dx.doi.org/10.1002/mop.4650080410.

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30

Qureshi, Ubaid Ur Rahman, Shahid Basir, Fazal Subhan, et al. "A Miniaturized Arc Shaped Near Isotropic Self-Complementary Antenna for Spectrum Sensing Applications." Sensors 23, no. 2 (2023): 927. http://dx.doi.org/10.3390/s23020927.

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This paper presents the design of an arc-shaped near-isotropic self-complementary antenna for spectrum sensing application. An arc-shaped dipole with horizontal and vertical arms is used to achieve a near isotropic radiation pattern. The radiation pattern improved by adjusting the horizontal and vertical arm lengths. Simulated and experimental results show that the proposed antenna has an impedance bandwidth of 146% (2.4–18.4 GHz) for VSWR ≤ 2 with a good radiation pattern. In order to quantify the antenna performance, antenna gain variation, bandwidth, efficiency, and size have been compared

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Mahlaoui, Zakaria, Eva Antonino-Daviu, and Miguel Ferrando-Bataller. "Radiation Pattern Reconfigurable Antenna for IoT Devices." International Journal of Antennas and Propagation 2021 (August 17, 2021): 1–13. http://dx.doi.org/10.1155/2021/5534063.

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Based on the characteristic mode theory, a versatile radiation pattern reconfigurable antenna is proposed. The analysis starts from two parallel metallic plates with the same and different dimensions. By means of two PIN diodes, the size of one of the parallel metallic plates can be modified and consequently the behavior of the radiation pattern can be switched between bidirectional and unidirectional radiation patterns. Moreover, a SPDT switch is used to adjust the frequency and match the input impedance. The reconfigurable antenna prototype has been assembled and tested, and a good agreement

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Капшай, В. Н., та А. А. Шамына. "Генерация второй гармоники от тонкого цилиндрического слоя. II. Анализ решения". Журнал технической физики 126, № 6 (2019): 732. http://dx.doi.org/10.21883/os.2019.06.47766.375-18.

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The solution is analyzed for the problem of the second harmonic generation by a plane electromagnetic wave with elliptical polarization from a thin optically nonlinear layer on the surface of a cylindrical particle of finite size. A graphical analysis of the solution is carried out by constructing three-dimensional radiation patterns characterizing the spatial distribution of the second-harmonic radiation power and its polarization. It is found that for small radii of the base of the cylindrical particle, each anisotropy coefficient corresponds to its own individual shape of the radiation patt

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Pavlovich, O. V., A. N. Gribanov, S. E. Gavrilova, G. F. Moseychuk, and I. A. Kuznetsov. "Generalized characteristics of expanded sector beams formed by phased antenna arrays obtained by scaling phase distributions." Journal of «Almaz – Antey» Air and Defence Corporation, no. 1 (March 30, 2020): 46–54. http://dx.doi.org/10.38013/2542-0542-2020-1-46-54.

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This paper considers specific features of the phase synthesis of expanded sector beams formed by phased antenna arrays by the method of fan partial diagrams. Partial radiation patterns are formed by pairs of adjacent emitters. The synthesis results have the property of scaling, which allows many expansion options to be obtained on the basis of one expansion option. This is achieved by multiplying the phase shift values of the signals from all emitters by the same value. It is shown that, when the beam expands along the sum channel, a radiation pattern with an extended angular distance between

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Saikia, B., and K. Borah. "Parasitic Array Based Radiation Pattern Reconfigurable Patch Antenna for WLAN Application." Advanced Electromagnetics 11, no. 4 (2022): 42–50. http://dx.doi.org/10.7716/aem.v11i4.2033.

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This article presents a radiation pattern reconfigurable patch antenna using three rectangular parasitic elements for WLAN (5.8 GHz) application. A rectangular driven patch with two parasitic elements placed parallel to both non-radiating edges and the third parasitic element is located on the radiating edge of driven element. The parasitic elements located on non-radiating edges are loaded with shorting posts. The electrical connection between the post and ground plane is controlled by an RF PIN diode switch. Based on switching state (ON/OFF) of the PIN diodes, post loaded parasitic elements,

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Xiao, Gaobiao, Ting Zang, and Rui Liu. "Synthesis of Non-Mirror-Symmetrical Far-Field Patterns Using Two Parallel Current Sheets." Electronics 12, no. 4 (2023): 892. http://dx.doi.org/10.3390/electronics12040892.

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This paper shows that the radiation patterns and polarizations on the two sides of the source plane can be controlled separately if two parallel current sheets are used. An efficient algorithm is proposed to determine the propagation components of the currents on the two sheets directly from the specified radiation pattern. Numerical examples demonstrate that the algorithm is effective for synthesizing radiation patterns with complex footprints and beam-wise polarizations. Although the resultant continuous current distribution is not easy to implement in practical applications, it provides a u

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Orugu, Rangarao, M. Nesasudha, and Doondi Kumar Janapala. "Metamaterial Inspired Azimuth Pattern-Reconfigurable Antenna for 5G Applications." International Journal on Recent and Innovation Trends in Computing and Communication 11, no. 6 (2023): 28–33. http://dx.doi.org/10.17762/ijritcc.v11i6.6768.

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A Radiation reconfigurable antenna is presented for n78 band 5G applications. A planar monopole is combined by a tuning fork and a U shaped strip to form radiating element. A partial ground is maintained at back side. Four metamaterial unit cells are used in this design, two at each side of the radiator to achieve the radiation re-configurability. Comb shaped metamaterial unit cells are placed in a clock wise direction around the antenna and connected to radiator via BAR-64-02V PIN diodes. The proposed reconfigurable antenna operates at 3500MHz for almost all switching conditions. On the basis

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Dong, Wenjie, and M. Nafi Toksöz. "Borehole seismic‐source radiation pattern in transversely isotropic media." GEOPHYSICS 60, no. 1 (1995): 29–42. http://dx.doi.org/10.1190/1.1443759.

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We extend previous discussions on crosswell tomography in anisotropic formations by deriving the radiation patterns of three typical downhole seismic sources (impulsive air gun or dynamite, wall‐clamped vertical vibrators, and cylindrical bender) inside a fluid‐filled borehole embedded in a transversely isotropic (TI) formation. The method of steepest descents, in conjuncture with the low‐frequency and far‐field assumptions, is applied to the exact displacement integrals of these sources to obtain their radiation patterns asymptotically. In spite of complications caused by quasi‐P‐ and quasi‐S

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Shankpal, Preetham, Varun Arur, Govind Kadambi, and James Shuttleworth. "A Generalized Approach for Computation of Near Field Radiation Pattern of an Antenna." International Journal of Antennas and Propagation 2014 (2014): 1–18. http://dx.doi.org/10.1155/2014/958148.

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A generalized procedure in the form of an analytical formulation for the determination of radiation pattern of an antenna at any arbitrary distance which covers the near field as well as far field is presented in this paper. With the prior knowledge of either the current or field distribution on the radiating aperture, the proposed near field analysis is generic and can be applied for wide variety of antenna elements. The underlying principle of the generalized procedure is tantamount to considering the radiating aperture as an array of point electric and magnetic dipoles. The validity and nov

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Martin, Christopher H., and Emilie J. Richards. "The Paradox Behind the Pattern of Rapid Adaptive Radiation: How Can the Speciation Process Sustain Itself Through an Early Burst?" Annual Review of Ecology, Evolution, and Systematics 50, no. 1 (2019): 569–93. http://dx.doi.org/10.1146/annurev-ecolsys-110617-062443.

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Rapid adaptive radiation poses two distinct questions apart from speciation and adaptation: What happens after one speciation event and how do some lineages continue speciating through a rapid burst? We review major features of rapid radiations and their mismatch with theoretical models and speciation mechanisms. The paradox is that the hallmark rapid burst pattern of adaptive radiation is contradicted by most speciation models, which predict continuously decelerating diversification and niche subdivision. Furthermore, it is unclear if and how speciation-promoting mechanisms such as magic trai

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Jasem, Rabah Abduljabbar. "Directive and Steerable Radiation Pattern using SASPA Array." Journal of Engineering 29, no. 3 (2023): 1–14. http://dx.doi.org/10.31026/j.eng.2023.03.01.

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This work examines the ability of a special type of smart antenna array known as Switched Active Switched Parasitic Antenna (SASPA) to produce a directive and electronically steerable radiation pattern. The SASPA array consists of antenna elements that are switchable between active and parasitic states by using P-Intrinsic-N (PIN) diodes. The active element is the element that is supplied by the radio frequency while short-circuiting the terminals of an element in the array results in a parasitic element. Due to the strong mutual coupling between the elements, a directional radiation pattern w

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Africa, Aaron Don Munsayac, Benjamin Emmanuel Uy, and Bianca Clarisse Tan. "Simulations on the effects of an optimized bowtie dipole antenna with an adaptive FIR filter." Bulletin of Electrical Engineering and Informatics 12, no. 3 (2023): 1550–59. http://dx.doi.org/10.11591/eei.v12i3.4406.

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In the evolution of technology through the years, antennas are use in varying wireless systems have been in demand. Antennas play a great role in transmitting and receiving signals. As its application is heavily used in many days to day activities, it is important to create a cost-efficient and quick way to analyze its performance, characteristics, and relationship to different variables. As many radiation pattern acquisition devices are expensive, this simulation proposes a quick, reliable, and cost-friendly way to simulate 2D patterns in the E-plane and H-plane of a bowtie dipole antenna wit

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Aaron, Don M. Africa, Emmanuel Uy Benjamin, and Clarisse Tan Bianca. "Simulations on the effects of an optimized bowtie dipole antenna with an adaptive FIR filter." Bulletin of Electrical Engineering and Informatics 12, no. 3 (2023): 1550~1559. https://doi.org/10.11591/eei.v12i3.4406.

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Abstract:

In the evolution of technology through the years, antennas are use in varying wireless systems have been in demand. Antennas play a great role in transmitting and receiving signals. As its application is heavily used in many days to day activities, it is important to create a cost-efficient and quick way to analyze its performance, characteristics, and relationship to different variables. As many radiation pattern acquisition devices are expensive, this simulation proposes a quick, reliable, and cost-friendly way to simulate 2D patterns in the E-plane and H-plane of a bowtie dipole antenna wit

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43

Song, Hai-Na, Zhao-Hui Chen, and Jian-Feng Li. "A Triband Patch Antenna with Monopole-like and Patch-like Radiation Patterns for Multifunctional Wireless Systems." International Journal of Antennas and Propagation 2020 (June 11, 2020): 1–12. http://dx.doi.org/10.1155/2020/3268729.

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A triband patch antenna with monopole-like and patch-like radiation patterns for multifunctional wireless systems is proposed. The antenna consists of a single square radiation patch with an annular slot, a ground plane, and a top-loaded metal sheet. The top-loaded metal sheet is shorted to the ground plane for producing a zeroth-order resonant (ZOR) mode, which has an omnidirectional radiation pattern at the lowest operation band, and its performance is robust to the location of the probe feed. With the annular slot and the off-center probe feed, a dual-resonant TM01 mode is excited, yielding

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Guy, Travis N., and Scott B. Nokleby. "Development of an end-effector system for autonomous spraying applications and radiation surveying." Transactions of the Canadian Society for Mechanical Engineering 44, no. 4 (2020): 541–57. http://dx.doi.org/10.1139/tcsme-2019-0184.

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This paper presents the design and testing of a scale proof-of-concept prototype robotic end-effector system for autonomous robotic shotcrete application and radiation surveying in underground uranium mining environments. The system presented consists of two functionally distinct prototype tools that achieve the independent tasks of autonomous robotic spray pattern control and surface radiation surveying. The first prototype tool presented is a novel, robotic shotcrete spraying tool that is capable of autonomously maintaining and adjusting its circular spray pattern diameter on target surfaces

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Pasco-Viel, Emmanuel, Lei Yang, Monette Veran, et al. "Stability versus diversity of the dentition during evolutionary radiation in cyprinine fish." Proceedings of the Royal Society B: Biological Sciences 281, no. 1780 (2014): 20132688. http://dx.doi.org/10.1098/rspb.2013.2688.

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Evolutionary radiations, especially adaptive radiations, have been widely studied but mainly for recent events such as in cichlid fish or Anolis lizards. Here, we investigate the radiation of the subfamily Cyprininae, which includes more than 1300 species and is estimated to have originated from Southeast Asia around 55 Ma. In order to decipher a potential adaptive radiation, within a solid phylogenetic framework, we investigated the trophic apparatus, and especially the pharyngeal dentition, as teeth have proved to be important markers of ecological specialization. We compared two tribes with

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Vaudon, Patrick, Bernard Jecko, and Patrice Brachat. "Some relations between the radiation patterns in the two main planes and the whole radiation pattern." Annales Des Télécommunications 51, no. 5-6 (1996): 227–32. http://dx.doi.org/10.1007/bf02999802.

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Nagasawa, Koji, Isamu Mastuzuka, and Nozomu Hasebe. "Generation of Rectangular Radiation Patterns by using a Pattern Synthesis Method." Journal of the Institute of Image Information and Television Engineers 54, no. 1 (2000): 111–17. http://dx.doi.org/10.3169/itej.54.111.

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Fadamiro, Akinwale Oluwaseyi, Oluwole John Famoriji, Rabiu S. Zakariyya, et al. "Temperature Variation Effect on a Rectangular Microstrip Patch Antenna." International Journal of Online and Biomedical Engineering (iJOE) 15, no. 05 (2019): 101. http://dx.doi.org/10.3991/ijoe.v15i05.9755.

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A novel hypothesis is proposed for the radiation pattern of a Rec-tangular Microstrip Patch Antenna sensitive to temperature variations from the ideal room temperature tolerance under which it was manufactured. In order to validate this hypothetical model, equations relating the resonating frequency, patch length and dielectric constant of the antenna to variations from the room temperature were improved. Simulations were carried out to validate the hypoth-esis in the drifts in ambient temperature effects on dimensions of the patch an-tenna and its field radiation patterns; including its direc

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Lagarkov, Andrey N., V. N. Semenenko, Alexey A. Basharin, and N. P. Balabukha. "Abnormal Radiation Pattern of Metamaterial Waveguide." PIERS Online 4, no. 6 (2008): 641–44. http://dx.doi.org/10.2529/piers071220103345.

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Kang, W. S., J. A. Park, and Y. J. Yoon. "Simple reconfigurable antenna with radiation pattern." Electronics Letters 44, no. 3 (2008): 182. http://dx.doi.org/10.1049/el:20082994.

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