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Статті в журналах з теми "Linear antennas"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Ramya, M., V. Parthipan, and M. Yogadeepan. "Certain Investigations on Edge Fed Microstrip Patch Array Antenna for WiMAX Applications." Asian Journal of Electrical Sciences 4, no. 1 (2015): 1–7. http://dx.doi.org/10.51983/ajes-2015.4.1.1937.

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Анотація:

Recently, a new wireless technology, i.e., Worldwide interoperability for Microwave Access (WiMAX), has been demonstrated to have its strong potential to provide a very high speed of broadband services. By simultaneously using multiple antennas at transmitter and receiver sites, these systems exploit the spatial dimension of the propagation channel. The development of such antennas includes the design of array antenna, optimizing the array antenna parameters and thereby increasing its performance. This paper mainly focuses on design of single microstrip patch antennae and linear array configur

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2

S. ALZAHRANI, AHMED, and ADNAN M. AFFANDI. "High Gain Microstrip Active Antenna Utilizes as Transmitter and Receiver with Linear and Circular Polarization." Academic Journal of Research and Scientific Publishing 3, no. 30 (2021): 48–62. http://dx.doi.org/10.52132/ajrsp.e.2021.304.

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Анотація:

In this research paper, a high gain microstrip active antenna is operating as transmitter and receiver at the same time with linear and circular polarization operations. This proposed work contains five essential parts such as high gain and broadband applications. Firstly, mainly is dealing with passive patch antennas. These selected passive antennas enjoy both high gain and broadband applications. Part two intends to convert the selected passive patch antennas into an active antenna. Part three intended to improve the performances of the proposed active integrated antennas. Part four enhancem

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3

Surutka, Jovan, and Dragutin Velickovic. "Symmetrical linear antennas driven by two-wire lines." Serbian Journal of Electrical Engineering 1, no. 1 (2003): 27–60. http://dx.doi.org/10.2298/sjee0301027s.

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A new theoretical approach to the problem of the symmetrical linear antenna driven by a two-wire line is presented. Then symmetrical linear antenna and the feeder line are treated as a unique boundary-value problem leading to a system of two simultaneous integral equations containing antenna and line currents as unknown sub-integral functions. The integral equations are approximately solved by the so-called point-matching method. Due to the mutual coupling between the antenna and the line, a new conveniently defined apparent driving-point admittance is to be introduced. The method is applied o

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4

van Aardt, Ruan, Johan Joubert, and Johann W. Odendaal. "A Dipole with Reflector-Backed Active Metasurface for Linear-to-Circular Polarization Reconfigurability." Materials 15, no. 9 (2022): 3026. http://dx.doi.org/10.3390/ma15093026.

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In recent years, significant advances have been made in diversifying the capabilities of communication systems by using reconfigurable antennas. There are many types of reconfigurable antennas—to achieve pattern, frequency, or polarization reconfigurability. These antennas are reconfigured either by the mechanical rotation of surfaces or by enabling or disabling specific sections of the structure using electrical switches. This paper focuses on the concept of a polarization reconfigurable antenna based on an active reflector-backed metasurface. An antenna system based on an active reflector-ba

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5

Venouil, Anton, Matthieu Egels, Philippe Pannier, Mohammed Benwadih, Christophe Serbutoviez, and Chaouki Hannachi. "Performance Analysis of a Screen-Printing Process for Cost-Effective Flexible Bow-Tie Antennas." J 8, no. 2 (2025): 20. https://doi.org/10.3390/j8020020.

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This paper presents a comparative analysis of performance for several antenna prototypes using a screen-printing process. This analysis was performed using various bow-tie antenna configurations, including single-band and multi-band antennas with linear or circular polarization over multiple operating frequency ranges. For antenna implementations, three different conductive inks and two resolutions of screen masks were tested. The performance of the fabricated prototypes has then been compared to the copper laser-etched antennas. This study revealed that with the proper selection of ink thinne

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6

Mustafa, H. Abu Nasr. "Z-SHAPED DIPOLE ANTENNA AND ITS FRACTAL ITERATIONS." International Journal of Network Security & Its Applications (IJNSA) 5, no. 5 (2013): 139–51. https://doi.org/10.5281/zenodo.5520190.

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Анотація:

Z-shaped dipole and fractal Z-shaped dipole antennas made of wires are introduced. Theses antennas exhibit lower resonant frequencies and small space occupations. The performance characteristics of the proposed antennas are examined and compared with successive iterations for the same wire length. The radiation properties are considered including input impedance and VSWR as functions of frequency. Also the comparison between the third iteration of fractal Z-shaped dipole antenna and linear dipole antenna with the same wire length are presented.

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7

Gui, Jaime, José L. Leiva, Aurora Andújar, Jaap Groot, Joan L. Pijoan, and Jaume Anguera. "Linearly Polarized Antenna Boosters versus Circularly Polarized Microstrip Patch Antennas for GPS Reception in IoT Devices." Energies 15, no. 24 (2022): 9623. http://dx.doi.org/10.3390/en15249623.

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GPS has become an attractive feature for geolocalization enabling asset tracking IoT devices. GPS satellite antennas radiate RHCP (right-hand circularly polarized) electromagnetic waves; thus, the typical antenna at the receiver is also RHCP. However, when the orientation of the receiving device is random, linear polarization antennas operate better in terms of TTFF (time to first fix). Through field measurements (urban and field) and considering different positions of the device in a vehicle, an RHCP microstrip patch antenna and a linear non-resonant antenna element called an antenna booster

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8

Tsay, Tain-Sou. "Small Loop Antenna System Design for Radio Direction Finding." WSEAS TRANSACTIONS ON COMMUNICATIONS 20 (December 16, 2021): 172–76. http://dx.doi.org/10.37394/23204.2021.20.22.

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Анотація:

In this literature, a low-cost small loop antenna is developed for radio direction finding. It consists of two coupled rectangular counter-wiring loop antennas. A signal-processing circuit is developed also for demodulated outputs. A single rectangular loop antenna is discussed first for illustrating the receiving characteristics and then the proposed two coupled rectangular counter-wiring loop antennas are designed for radio direction finding. Measurements give a large linear detecting range. It is ready for Omni-directional application using another two coupled loop antennas and can be used

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9

Lampe, Bernhard, and Klaus Holliger. "Resistively loaded antennas for ground-penetrating radar: A modeling approach." GEOPHYSICS 70, no. 3 (2005): K23—K32. http://dx.doi.org/10.1190/1.1926574.

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Анотація:

The design of surface ground-penetrating radar (GPR) antennas is inherently difficult, primarily because the presence of the air-soil interface greatly complicates both analytic and laboratory-based approaches aimed at characterizing the antennas. Versatile numerical simulation techniques capable of describing the key physical principles governing GPR antenna radiation offer new solutions to this problem. We use a finite-difference time-domain (FDTD) solution of Maxwell's equations in three dimensions to explore the radiation characteristics of various bow-tie antennas (including quasi-linear

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10

Kuz'kin, Venedikt M., Sergey A. Pereselkov, Yuri V. Matvienko, Vladimir I. Grachev, Sergey A. Tkachenko, and Nadezhda P. Stadnaya. "Holographic processing of hydroacoustic information using linear antennas." Radioelectronics. Nanosystems. Information Technologies. 15, no. 2 (2023): 169–78. http://dx.doi.org/10.17725/rensit.2023.15.169.

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The formation of an interferogram and a hologram of a moving underwater noise source using linear antennas is considered. The relationship between the spectral density of the hologram and the aperture and the angular dependence of the received field is derived. Antenna gain has been estimated. The issue of the limiting signal-to-noise ratio at which the holographic processing remains operational is discussed. An analytical expression is obtained that establishes a relationship between the signal/noise ratios at the output and input of the antenna. Conditions are formulated under which the inte

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11

Surducan, E., V. Surducan, D. Iancu, and J. Glossner. "Multiband Antennas for SDR Applications." International Journal of Digital Multimedia Broadcasting 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/460143.

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Анотація:

We present multiband antennas configurations for SDR applications. Using a composite folded dipole structure as starting point, we derived more complex antenna configurations to support multiple communication protocols for mobile application with linear and circular polarizations. Prototypes as single antenna with circular polarization, tunable single antenna with PIN diode and MIMO systems with three and four antennas, all derivatives of the same basic structure, were produced in an iterative fashion until the desired parameters were achieved. These antennas are suitable for microstrip circui

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12

Tumakov, Dmitrii, Dmitry Chikrin, and Petr Kokunin. "Miniaturization of a Koch-Type Fractal Antenna for Wi-Fi Applications." Fractal and Fractional 4, no. 2 (2020): 25. http://dx.doi.org/10.3390/fractalfract4020025.

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Анотація:

Koch-type wire dipole antennas are considered herein. In the case of a first-order prefractal, such antennas differ from a Koch-type dipole by the position of the central vertex of the dipole arm. Earlier, we investigated the dependence of the base frequency for different antenna scales for an arm in the form of a first-order prefractal. In this paper, dipoles for second-order prefractals are considered. The dependence of the base frequency and the reflection coefficient on the dipole wire length and scale is analyzed. It is shown that it is possible to distinguish a family of antennas operati

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13

Choi, Sang Won, and Youngje Sung. "Simple Dual-Feed Dual-Circular Polarization Antenna with High Isolation." Journal of Electromagnetic Engineering and Science 23, no. 2 (2023): 74–84. http://dx.doi.org/10.26866/jees.2023.2.r.155.

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A dual-feed antenna system with circular polarization (CP) diversity and high isolation is proposed in this paper. The proposed antenna consists of two bent monopole antennas and an isosceles triangular partial GND on a single layer. To simply design an antenna with dual-feed dual-CP characteristics, CP bandwidth (BW) is optimized based on a single antenna. The proposed antenna is structurally different from conventional antennas in three ways. Structural asymmetry is realized by bending the shape of the antenna and moving the position, and thus good CP characteristics are obtained. The feedin

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14

Levin, Boris. "About Microstrip Antennas." Applied Science and Innovative Research 6, no. 3 (2022): p1. http://dx.doi.org/10.22158/asir.v6n3p1.

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Анотація:

The electrical characteristics of a microstrip antenna are considered. Its design and electrical characteristics are compared with design and electrical characteristics of volume self-complementary antennas and an antenna located on the faces of a lying rectangular pyramid. The method of a complex potential is used for an analysis of the substrate influence on the properties of this antenna. In accordance with the results of comparing the characteristics of linear radiators with different current distributions, the design of a microstrip antenna with an in-phase distribution was proposed, whic

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15

Jocelyn Tanguy, TASONA DOKO, MATANGA Jacques, MALONG Yannick, and ESSIBEN DIKOUNDOU Jean-François. "DIMENSIONING OF FIXED FREQUENCY PATCH ANTENNAS BASED ON NEURAL NETWORKS." International Journal of Scientific Research and Management 10, no. 04 (2022): 862–70. http://dx.doi.org/10.18535/ijsrm/v10i4.ec09.

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Анотація:

During the last decades the race for innovation in communication systems has not ceased to evolve, which has led to important studies in the field of antennas, which today have very different forms depending on the applications such as: mobile telecommunications, television, radio, satellites, communicating systems, radar, remote sensing, radio astronomy [1]. Among the most used antenna families are the microstrip antennas (also called printed antennas or patch antennas) [2]. These antennas are characterized by: low manufacturing cost, mass production possible, linear and circular polarization

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16

Park, Daesung, and Jaehoon Choi. "A Dual-Band Dual-Polarized Antenna with Improved Isolation Characteristics for Polarimetric SAR Applications." Applied Sciences 11, no. 21 (2021): 10025. http://dx.doi.org/10.3390/app112110025.

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Анотація:

A dual-band dual-polarized antenna with high isolation characteristics is proposed for polarimetric synthetic aperture radar (PolSAR) applications. The antenna consists of four dipole antennas and 2 × 2 patch antenna arrays operating at the P-band (450–730 MHz) and Ka-band (34–36 GHz), respectively. The dipole antennas and the patch antenna arrays need dual-linear polarization characteristics to acquire PolSAR data. Improvements in the isolation characteristics at the P-band are achieved by inserting a metamaterial absorber with a fractal geometry between the transmitting (Tx) and receiving (R

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17

Allanic, Rozenn, Denis Le Berre, Cédric Quendo, et al. "On-Chip Polarization Reconfigurable Microstrip Patch Antennas Using Semiconductor Distributed Doped Areas (ScDDAs)." Electronics 11, no. 12 (2022): 1905. http://dx.doi.org/10.3390/electronics11121905.

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This paper presents two polarization reconfigurable patch antennas using semiconductor distributed doped areas (ScDDAs) as active components. One proposed antenna has a switching polarization between two linear ones, while the other one has a polarization able to commute from a linear to a circular one. The antennas are designed on a silicon substrate in order to have the ScDDAs integrated in the substrate, overcoming the needs of classical PIN diodes. Therefore, the proposed co-design method between the antenna and the ScDDAs permits us to optimize the global reconfigurable function, designin

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18

Zheng, Bin, Xiangyang Li, Xin Rao, and Na Li. "Multi-Beam Conformal Array Antenna Based on Highly Conductive Graphene Films for 5G Micro Base Station Applications." Sensors 22, no. 24 (2022): 9681. http://dx.doi.org/10.3390/s22249681.

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Анотація:

Recently, micro base station antennas have begun to play a more important role in 5G wireless communication, with the rapid development of modern smart medical care, the Internet of things, and portable electronic devices. Meanwhile, in response to the global commitment to long-term carbon neutrality, graphene film has received significant attention in the field of antennas due to its low carbon environmental impact and high electrical conductivity properties. In this work, a conformal array antenna based on highly conductive graphene films (CGF) is proposed for 5G millimeter-wave (MMW) applic

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19

Hui, Wei-Hua, Yao Guo, and Xiao-Peng Zhao. "A Simple Linear-Type Negative Permittivity Metamaterials Substrate Microstrip Patch Antenna." Materials 14, no. 16 (2021): 4398. http://dx.doi.org/10.3390/ma14164398.

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Анотація:

A microstrip patch antenna (MPA) loaded with linear-type negative permittivity metamaterials (NPMMs) is designed. The simple linear-type metamaterials have negative permittivity at 1–10 GHz. Four groups of antennas at different frequency bands are simulated in order to study the effect of linear-type NPMMs on MPA. The antennas working at 5.0 GHz are processed and measured. The measured results illustrate that the gain is enhanced by 2.12 dB, the H-plane half-power beam width (HPBW) is converged by 14°, and the effective area is increased by 62.5%. It can be concluded from the simulation and me

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20

Wu, Rong Gang, Mei Guo Gao, Jin Liang Gai, and Jin Liang Bai. "Research on Orthogonal Half-Wavelength Dipole Antenna." Applied Mechanics and Materials 20-23 (January 2010): 801–7. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.801.

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Анотація:

As any linear antennas can be considered to be comprised of a large number of dipole antenna, therefore the study of dipole antenna characteristics has a very important significance to the application of the general linear antennas. In this paper, Firstly, the radiation field of the dipole antenna is analyzed, and then the radiation field mathematic model of a specific structural antenna is established. The antenna is composed of two orthogonal half-wavelength dipoles, and the current phase of one dipole is advanced the other by 90°. According to the polarization theory of electromagnetic wave

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21

Dahl, Christoph, Michael Vogt, and Ilona Rolfes. "Fractal antenna arrays for MIMO radar applications." International Journal of Microwave and Wireless Technologies 9, no. 10 (2017): 2019–28. http://dx.doi.org/10.1017/s1759078717001015.

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In this contribution, fractal antenna arrays are analyzed for their applicability in multiple-input multiple-output (MIMO) radars. Array geometries based on the Fudgeflake fractal and the Gosper island fractal are investigated. In addition, a concept for the combination of both fractals is shown in order to increase the flexibility concerning the number of transmitting and receiving antennas. The presented fractal MIMO concepts can be utilized in order to improve the angular resolution and to reduce the sidelobe level for a given number of transmitting and receiving antennas. It is shown that

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22

Bestugin, Aleksandr, Sergey Dvornikov, Sergey Dvornikov, and Irina Kirshina. "Study of the electrical parameters dependences of oblique log-periodic antennas on the geometric structure of their reducing elements." Journal of Physics: Conference Series 2373, no. 6 (2022): 062007. http://dx.doi.org/10.1088/1742-6596/2373/6/062007.

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Abstract Antenna systems are an integral part of any transmitter-receiver device. A broad-band and frequency-independent antenna can be created applying a principle of electrical similarity. Its essence is that the electrical parameters of antennas remain unchanged if, with a decrease or increase in wavelength n times and, accordingly, decrease or increase the linear dimensions of the antenna elements. It is very important to guarantee the constancy of the antenna-radiating element’s parameters in a sufficiently wide frequency range. Log-periodic, biconical and various types of helical antenna

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23

Kumar, Indrajeet, and Ritesh Kumar Mishra. "An Investigation of Spectral Efficiency in Linear MRC and MMSE Detectors with Perfect and Imperfect CSI for Massive MIMO Systems." Traitement du Signal 38, no. 2 (2021): 495–501. http://dx.doi.org/10.18280/ts.380229.

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In this paper, the performance of two linear detectors in multi-user (MU) multiple-input multiple-output (MIMO) systems is investigated. The uplink sum rate and lower bound of channel capacity is derived for both maximum-ratio combination (MRC) and minimum mean square error (MMSE) schemes considering imperfect and perfect channel state information (CSI) conditions. Results show that linear detector performance improves dramatically when the number of base station (BS) users is smaller than that of BS antennas. It is being demonstrated that in the case of imperfect CSI and the number of BS ante

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24

Liodakis, George S., Melina P. Ioannidou, Nikolaos S. Petrakis, et al. "Effect of Buildings on the Radiation Characteristics of MF Broadcast Antennas." Applied Sciences 12, no. 13 (2022): 6525. http://dx.doi.org/10.3390/app12136525.

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This study aims to investigate the impact of the presence of buildings on the radiation characteristics of MF broadcast antennas. Two different antennas are considered: a monopole operating at 1494 kHz and a two-element linear array radiating at 1008 kHz. The buildings were modeled as wire-grids and the total electric field intensity was calculated as the sum of the scattered field by the wire-grid and the field radiated from the antenna in free space. The radiation pattern of the antennas, when one or two buildings were situated in their vicinity, were the end result of the analysis, and they

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25

Yang, Xueqing, Nicola Anselmi, and Paolo Rocca. "Thinned Linear Optical Phased Array Design Through a Pareto-Optimal Synthesis Strategy." Sensors 25, no. 4 (2025): 1096. https://doi.org/10.3390/s25041096.

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The design of a thinned linear optical phased array (OPA) comprising a collection of waveguide grating antennas (WGAs) is addressed in this work. Given a fully populated linear OPA with antennas located in a uniform grid, the problem of selecting which elements have to be removed or retained is formulated as an optimization one. To this end, the definition of the optimal thinning architecture is produced through a multi-objective optimization strategy with the goal of minimizing the number of required antenna elements while maintaining a low sidelobe level and narrow beam width. A set of repre

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26

Jo, A.-Min, Jeong-Eun Oh, and Eui-Rim Jeong. "Transmit Antenna Selection Based on SNR prediction in TDD Systems Using Convolutional Neural Network." International Journal of Electrical and Electronics Research 11, no. 2 (2023): 500–505. http://dx.doi.org/10.37391/ijeer.110235.

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This paper proposes a method for predicting future signal-to-noise ratio (SNR) in a time-division-duplexing (TDD) mobile communication environments using a convolutional neural network (CNN). The communication system uses multiple receive antennas and transmit using only one or two antennas among them. A CNN model is proposed to predict the SNR at a future transmission time based on past SNRs received from multiple antennas. The probability of reception at a certain is set to 10-100%. In case that SNR cannot be measured due to the absence of reception, linear interpolation is performed using t

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27

Ashvanth, Balu. "A tunable frequency selective surface integrated high isolation MIMO antenna for THz applications." Engineering Research Express 4, no. 4 (2022): 045001. http://dx.doi.org/10.1088/2631-8695/ac92c6.

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Abstract A novel tunable triple stop band frequency selective surface (FSS) is designed and integrated with the multiple inputs multiple outputs (MIMO) antenna as an isolation structure to verify its validity. The proposed FSS renders excellent isolation characteristics for the reported MIMO system which is verified from the ECC and DG plot. In FSS, the graphene materials are attached at the end of three stubs to realize tuning over the respective bands. The center frequency of the attained triple bands shows an obvious shift from 2.2 to 2.4 THz, 3.15 to 3.5 THz, and 4.6 to 4.9 THz on increasi

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28

Vasudevan, Ayyem Pillai, and R. Sudhakar. "A Low Complexity Near-Optimal MIMO Antenna Subset Selection Algorithm for Capacity Maximisation." International Journal of Antennas and Propagation 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/956756.

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Анотація:

Multiple input multiple output (MIMO) wireless systems employ a scheme called antenna subset selection for maximising the data rate or reliability for the prevailing channel conditions with the available or affordable number of radio frequency (RF) chains. In this paper, a low-complexity, and near-optimal performance fast algorithm is formulated and the detailed algorithm statements are stated with the exact complexity involved for capacity-maximising receive-only selection. The complexities of other receive-only selection comparable algorithms are calculated. Complexities have been stated in

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29

Trujillo-Romero, Citlalli Jessica, Juan Dionisio Merida, Texar Javier Ramírez-Guzmán, et al. "Thermal Evaluation of Multi-Antenna Systems Proposed to Treat Bone Tumors: Finite Element Analysis." Sensors 22, no. 19 (2022): 7604. http://dx.doi.org/10.3390/s22197604.

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Анотація:

Microwave ablation is commonly used in soft tissue tumors, but its application in bone tumors has been barely analyzed. Antennas to treat bone tissue (~3 cm2), has been lately designed. Bone tumors at pathological stage T1 can reach 8 cm wide. An antenna cannot cover it; therefore, our goal is to evaluate the thermal performance of multi-antenna arrays. Linear, triangular, and square configurations of double slot (DS) and monopole (MTM) antennas were evaluated. A parametric study (finite element method), with variations in distance between antennas (ad) and bone thickness (bt) was implemented.

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30

Gupta, Lavesh, and Arun Dev Dhar Dwivedi. "Suppression of Mutual Coupling Between Two Microstrip Patch Antennas using a Sophisticated Non-Linear DGS Structure for High Frequency Wave Applications." Law, State and Telecommunications Review 10, no. 1 (2018): 161–84. http://dx.doi.org/10.26512/lstr.v10i1.21505.

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Анотація:

Purpose – If the two or more than two antennas are present in the antenna array, the mutual coupling between them becomes a critical issue to deal with. At microwave frequency, microstrip design is often used as a transmission line because of its good performance in transferring the energy and microwave signals. Most commonly used microstrip antenna has similar structure as that of the microstrip line. On one side of dielectric substrate layer, is an extremely thin layer of conductor that forms the radiating elements and on bottom side is the ground plane made up of metallic material. Our main

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31

Qureshi, Sara Shakil, Sajid Ali, and Syed Ali Hassan. "Linear and Decoupled Decoders for Dual-Polarized Antenna-Based MIMO Systems." Sensors 20, no. 24 (2020): 7141. http://dx.doi.org/10.3390/s20247141.

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Quaternion orthogonal designs (QODs) have been used to design STBCs that provide improved performance in terms of various design parameters. In this paper, we show that all QODs obtained from generic iterative construction techniques based on the Adams-Lax-Phillips approach have linear and decoupled decoders which significantly reduce the computational complexity at the receiver. Our result is based on the quaternionic description of communication channels among dual-polarized antennas. Another contribution of this work is the linear and decoupled decoder for quasi-orthogonal codes for non-squ

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32

Gittinger, Moritz, Katja Höflich, Vladimir Smirnov, Heiko Kollmann, Christoph Lienau, and Martin Silies. "Strongly coupled, high-quality plasmonic dimer antennas fabricated using a sketch-and-peel technique." Nanophotonics 9, no. 2 (2020): 401–12. http://dx.doi.org/10.1515/nanoph-2019-0379.

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AbstractA combination of helium- and gallium-ion beam milling together with a fast and reliable sketch-and-peel technique is used to fabricate gold nanorod dimer antennas with an excellent quality factor and with gap distances of less than 6 nm. The high fabrication quality of the sketch-and-peel technique compared to a conventional ion beam milling technique is proven by polarisation-resolved linear dark-field spectromicroscopy of isolated dimer antennas. We demonstrate a strong coupling of the two antenna arms for both fabrication techniques, with a quality factor of more than 14, close to t

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Altintas, Gulsah, Ibrahim Akduman, Aleksandar Janjic, and Tuba Yilmaz. "A Novel Approach on Microwave Hyperthermia." Diagnostics 11, no. 3 (2021): 493. http://dx.doi.org/10.3390/diagnostics11030493.

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Microwave hyperthermia (MH) requires the selective focusing of microwave energy on the targeted region while minimally affecting the healthy tissue. Emerging from the simple nature of the linear antenna arrays, this work demonstrates focusing maps as an application guide for MH focusing by adjusting the antenna phase values. The focusing of the heating potential (HP) on different density breast models is performed via the proposed method using Vivaldi antennas. The effect of the tumor conductivity on the focusing is discussed. As a straightforward approach and utilizing the Vivaldi antennas, t

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Wan, Chunfeng, Liyu Xie, Kangqian Xu, et al. "Transverse deformation effect on sensitivity of strain-sensing patch antenna." International Journal of Distributed Sensor Networks 16, no. 3 (2020): 155014772090819. http://dx.doi.org/10.1177/1550147720908192.

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The strain sensor based on microwave patch antenna is proposed to monitor structural strain in structural health monitoring. When patch antenna experiences deformation, the resonant frequency of patch antenna will shift. With these characteristics, the patch antenna can operate as both the strain-sensing element and communication component. This article chooses an RT-5880 rectangular patch antenna for strain measurement, focusing on its sensing performance. For distinguishing the influence of deformation in the antenna’s length direction and width direction, the numerical simulation is impleme

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Vollbracht, D. "Understanding and optimizing microstrip patch antenna cross polarization radiation on element level for demanding phased array antennas in weather radar applications." Advances in Radio Science 13 (November 3, 2015): 251–68. http://dx.doi.org/10.5194/ars-13-251-2015.

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Abstract. The antenna cross polarization suppression (CPS) is of significant importance for the accurate calculation of polarimetric weather radar moments. State-of-the-art reflector antennas fulfill these requirements, but phased array antennas are changing their CPS during the main beam shift, off-broadside direction. Since the cross polarization (x-pol) of the array pattern is affected by the x-pol element factor, the single antenna element should be designed for maximum CPS, not only at broadside, but also for the complete angular electronic scan (e-scan) range of the phased array antenna

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TAMAS, Razvan. "FREQUENCY-DOMAIN AND TIME-DOMAIN RESPONSE SHAPING FOR ULTRA-WIDE BAND ANTENNAS." Annals of the Academy of Romanian Scientists Series on Science and Technology of Information 17, no. 2 (2024): 5–21. https://doi.org/10.56082/annalsarsciinfo.2024.2.5.

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This paper presents a synthesis approach for ultra-wide band (UWB) antennas, based on a variable slope profile. When applying the proposed approach in the time domain, one can synthesize antenna structures for pulsed excitation, designed to yield a low distortion response at a given direction or within a given plane and for a given polarization. The method is validated by synthesizing ultra-wide band antennas designed for a particular waveform of excitation. The applicability of our method to frequency domain synthesis is demonstrated by designing an antenna with a quasi-linear gain variation

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Yildiz, Gulsah, Tuba Yilmaz, and Ibrahim Akduman. "Rotationally Adjustable Hyperthermia Applicators: A Computational Comparative Study of Circular and Linear Array Applicators." Diagnostics 12, no. 11 (2022): 2677. http://dx.doi.org/10.3390/diagnostics12112677.

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Microwave breast hyperthermia (MH) aims to increase the temperature at the tumor location with minimal change in the healthy tissue. To this end, the specific absorption rate (SAR) inside the breast is optimized. The choice of the MH applicator design is important for a superior energy focus on the target. Although hyperthermia treatment planning (HTP) changes for every patient, the MH applicator is required to be effective for different breast models and tumor types. The linear applicator (LA) is one of the previously proposed applicator designs with linearly arranged antennas; however, it su

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38

Sabban, Albert. "Novel Meta-Fractal Wearable Sensors and Antennas for Medical, Communication, 5G, and IoT Applications." Fractal and Fractional 8, no. 2 (2024): 100. http://dx.doi.org/10.3390/fractalfract8020100.

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Future communication, 5G, medical, and IoT systems need compact, green, efficient wideband sensors, and antennas. Novel linear and dual-polarized antennas for 5G, 6G, medical devices, Internet of Things (IoT) systems, and healthcare monitoring sensors are presented in this paper. One of the major goals in the evaluation of medical, 5G, and smart wireless communication devices is the development of efficient, compact, low-cost antennas and sensors. Moreover, passive and active sensors may be self-powered by connecting an energy-harvesting unit to the antenna to collect electromagnetic radiation

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Floc'h, Jean-Marie, Ahmad El Sayed Ahmad, and Yvan Kokar. "Dual-Beam Antenna Design for Autonomous Sensor Network Applications." International Journal of Antennas and Propagation 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/289681.

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This paper describes our contribution in the ANR project called CAPNET dedicated to the site security (autonomous sensor network). The network is autonomous in term of energy and it is very easy to deploy on the site (the time to deploy each node of the network is around 10 minutes). The first demonstrator was deployed in the fire base station of Brest, France with 10 nodes with a security perimeter around 1.5 km. Our contribution takes place in the field of antennas, with the development of two systems: a single-beam antenna reserved for the supervisor or the last node of the network, and a d

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40

Longhi, Michela, Stefano Vellucci, Mirko Barbuto, Alessio Monti, Filiberto Bilotti, and Alessandro Toscano. "Optimization Tools for the Design of Meta-Covers for Linear Antenna with Beam- and Null-Steering Capabilities." Applied Sciences 15, no. 2 (2025): 553. https://doi.org/10.3390/app15020553.

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This paper investigates the optimization of cylindrical metasurface meta-covers designed to enable beamforming capabilities in single linear antennas. This study focuses on the development and application of advanced optimization tools to tailor the electromagnetic response of these metasurfaces, enabling precise control over the radiation patterns of the antenna. In particular, we develop a genetic algorithm-based optimization tool, which achieves precise manipulation of the main beam direction and null placement in the radiation pattern. The results further expand the applications of metasur

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Türker Tokan, Nurhan. "Optimization of the UWB Feed Antenna Position in Reflector Applications." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/961818.

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In reflector system design, achieving high stability of phase center position with changes in frequency in reflector feed antennas is highly desired. However, obtaining highly stable phase center is not possible for UWB feed antennas, specially for planar ones. Thus, an optimum positioning for the UWB feed antenna should be defined. Optimization of the positioning of the feed antenna is essential since this process lowers resulting phase error losses significantly. In this work, a novel method for optimizing the UWB feed position of a prime focus reflector antenna from phase and amplitude reco

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42

Ji, Changpeng, Xin Ning, and Wei Dai. "Design of Shared-Aperture Base Station Antenna with a Conformal Radiation Pattern." Electronics 14, no. 2 (2025): 225. https://doi.org/10.3390/electronics14020225.

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Aiming at solving the problem of radiation pattern distortion caused by coupling between antennas in different frequency bands in traditional shared-aperture base station array antennas, a new shared-aperture array antenna integrating high-frequency filtering units and medium-frequency electromagnetic transparent antenna units is proposed. Without adding additional decoupling structures, it is possible to effectively reduce the coupling of different frequencies, while weakening common-mode and scattering interferences, making the radiation pattern conformal. The array consists of an electromag

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43

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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44

Innes, Graeme. "Higher-order structural constraints for improved optimization of nonuniform helical antennas." Facta universitatis - series: Electronics and Energetics 33, no. 4 (2020): 531–51. http://dx.doi.org/10.2298/fuee2004531i.

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The objective is to improve the linear constraints for optimizing the helical structure (radius and pitch of the conductor winding) of nonuniform helical antennas for desired characteristics such as signal gain or bandwidth. Presented below are equations that allow various higher-order structural constraints to be used in such optimizations. Their efficacy is demonstrated by analogy, using data for a fully optimized Yagi-Uda antenna, before being applied to data available for helical designs. The comparisons confirm the general validity of the higher-order equations to model some of the most a

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45

Patidar, Hemant, Gautam Kumar Mahanti, and Ramalingam Muralidharan. "A Comparative Analysis of Evolutionary Algorithms for Synthesis of Scanned Linear Array of Mutually Coupled Parallel Dipole Antennas." International Journal of Electronics and Telecommunications 63, no. 2 (2017): 151–57. http://dx.doi.org/10.1515/eletel-2017-0020.

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Abstract This paper presents a comparative analysis of three evolutionary algorithms, namely, Backtracking Search Algorithm, Cuckoo Search Algorithm and Artificial Bee Colony Algorithms for synthesis of a scanned linear array of uniformly spaced parallel half wavelength dipole antennas. Here, antenna parameters, namely Side Lobe Level, reflection coefficient and wide null depth are taken into consideration for comparison between algorithms. In addition to it, statistical parameters, namely best fitness value, mean and standard deviation of the fitness values obtained from algorithms are compar

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46

Chi, Yu-Jen, and Fu-Chiarng Chen. "A novel quadri-polarization-agile microstrip antenna with polarization synthesizing feeding network." International Journal of Microwave and Wireless Technologies 8, no. 2 (2015): 385–94. http://dx.doi.org/10.1017/s1759078715000227.

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This paper proposes planar antennas with quadri-polarization diversity using a pair of orthogonal linear polarizations and a pair of orthogonal circular polarizations (CP). A novel feeding network with four input ports and four output ports is presented, allowing antenna polarization diversity by selecting different input ports, which can generate right-handed CP, left-handed CP, horizontal linear polarization, and vertical linear polarization. The first design uses two square patch resonators to synthesize the four polarizations; the second design comprises four circularly polarized patches t

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47

Povolotsky, F. K., and T. P. Sydorova. "Linear-phase aperture distribution antennas." IEEE Transactions on Antennas and Propagation 44, no. 6 (1996): 874–78. http://dx.doi.org/10.1109/8.509891.

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Jean-Fu Kiang. "Analysis of linear coaxial antennas." IEEE Transactions on Antennas and Propagation 46, no. 5 (1998): 636–42. http://dx.doi.org/10.1109/8.668905.

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Qing, Chao Jin, Jin Cheng Wei, You Xi Tang, and Jin Lian Liu. "Timing Acquisition Based on Cooperation Verification of Distributed Receive Antennas in Linear Cell." Applied Mechanics and Materials 340 (July 2013): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amm.340.551.

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To improve the probability of correct acquisition for distributed antenna system, a cooperation verification method of distributed antennas is proposed. In the flat Rayleigh channels of linear cell, the difference of time-delays is firstly exploited to compose a pre-condition for cooperation. Then, the timing acquisition based on threshold detection is performed at each distributed antenna. For eliminating part of acquisition errors, the cooperation verification is introduced into the timing acquisition according to pre-condition. Analysis and simulation results verify the correctness of the p

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50

Ohnimus, Florian, Uwe Maaß, Gerhard Fotheringham, et al. "Design and Comparison of 24 GHz Patch Antennas on Glass Substrates for Compact Wireless Sensor Nodes." International Journal of Microwave Science and Technology 2010 (February 7, 2010): 1–9. http://dx.doi.org/10.1155/2010/535307.

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Three patch antennas suitable for integration and operation in a compact 24 GHz wireless sensor node with radar and communication functions are designed, characterized, and compared. The antennas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies. This process is well suited for 3D stacking. The antennas are fed through a microstrip line underneath a ground plane coupling into the patch resonator through a slot aperture. Linear polarization (LP), dual mode (DM) operation, and circular polarization (CP) are achieved through the layout o

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