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Journal articles on the topic 'Coaxial monopoles'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Baker-Jarvis, J., and R. Inguva. "Dielectric Heating of Oil Shales By Monopoles and Modified Coaxial Applicators." Journal of Microwave Power and Electromagnetic Energy 23, no. 3 (January 1988): 160–70. http://dx.doi.org/10.1080/08327823.1988.11688051.

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2

Woo, Myung Kyun, Lance DelaBarre, Matt Thomas Waks, Young Woo Park, Russell Luke Lagore, Steve Jungst, Yigitcan Eryaman, Se-Hong Oh, Kamil Ugurbil, and Gregor Adriany. "Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla." Sensors 21, no. 18 (September 8, 2021): 6000. http://dx.doi.org/10.3390/s21186000.

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For human head magnetic resonance imaging at 10.5 tesla (T), we built an 8-channel transceiver dipole antenna array and evaluated the influence of coaxial feed cables. The influence of coaxial feed cables was evaluated in simulation and compared against a physically constructed array in terms of transmit magnetic field (B1+) and specific absorption rate (SAR) efficiency. A substantial drop (23.1% in simulation and 20.7% in experiment) in B1+ efficiency was observed with a tight coaxial feed cable setup. For the investigation of the feed location, the center-fed dipole antenna array was compared to two 8-channel end-fed arrays: monopole and sleeve antenna arrays. The simulation results with a phantom indicate that these arrays achieved ~24% higher SAR efficiency compared to the dipole antenna array. For a human head model, we observed 30.8% lower SAR efficiency with the 8-channel monopole antenna array compared to the phantom. Importantly, our simulation with the human model indicates that the sleeve antenna arrays can achieve 23.8% and 21% higher SAR efficiency compared to the dipole and monopole antenna arrays, respectively. Finally, we obtained high-resolution human cadaver images at 10.5 T with the 8-channel sleeve antenna array.

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3

Park, Mi Y., and Hyo J. Eom. "Coaxially fed monopoles in shorted waveguides." Microwave and Optical Technology Letters 49, no. 12 (2007): 3145–48. http://dx.doi.org/10.1002/mop.22959.

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4

Trintinalia, Luiz C. "Simple Excitation Model for Coaxial Driven Monopole Antennas." IEEE Transactions on Antennas and Propagation 58, no. 6 (June 2010): 1907–12. http://dx.doi.org/10.1109/tap.2010.2046872.

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5

Nasibullaeva, E. Sh. "Numerical simulation of acoustic scattering from coaxial sound-penetrable spheres." Multiphase Systems 14, no. 2 (2019): 115–24. http://dx.doi.org/10.21662/mfs2019.2.016.

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This paper presents a generalisation of the mathematical model and numerical study of the acoustic scattering problem from multiple spheres in the case of spheres through which the wave passes and whose centers are located on the same axis (the case of sound-penetrable and coaxial spheres) under the action of spherical waves from a monopoly radiation source arbitrarily located in space. When solving the Helmholtz equations, a numerical technique based on the fast multipole method has been adapted for this task, which allows one to achieve high accuracy of the results obtained with minimal computer time. Comparison of the different approaches to truncation infinite series in the expansion showed the following: the result with a good degree of accuracy by a single calculation gives approach based on the truncation of all the rows with a fixed number in each expansion, and the result with a certain degree of accuracy gives an approach based on comparing two consecutive values of the sum of the series. A numerical parametric analysis of the pressure distribution inside and outside the spheres is carried out for various values of their radii, physical characteristics of the external and internal media, the number of spheres, the distances between the centers of the spheres, the frequency of exposure and the location of the monopole radiation source. It is shown that at certain values of the parameters, the appearance of zones of decrease or increase in pressure behind sound-penetrable spheres is possible. The obtained results will further allow to carry out test calculations to verify the general numerical algorithm for the case of a multitude of spheres arbitrarily located in space.

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6

Chand, Prithish, Amar Dattatray Chaudhari, Rahul Keley, and Kamala Prasan Ray. "Low profile Compact Printed Monopole Antenna for Satellite based AIS Application." Defence Science Journal 70, no. 2 (March 9, 2020): 175–82. http://dx.doi.org/10.14429/dsj.70.14725.

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In this paper, a simple, low profile compact printed monopole antenna has been proposed for satellite based automatic identification system (SB-AIS). The design consists of a printed monopole, which has been meandered to achieve optimum size reduction. The detailed investigation in terms of bending of the arms of monopole, width of the patch and dimensions of the ground plane on the resonance frequency and input impedance is presented. The antenna is matched to a typical 50 Ω coaxial line without any requirement of external matching structures. The prototype of the antenna is fabricated and tested at an operating frequency of 161 MHz for SB-AIS, with compact size of 44.5 . 17 cm2. The measured results show that the antenna has a bandwidth of 15 MHz (9.3 per cent), gain of 1.87 dBi and beam-width of 82° in the elevation and omnidirectional in azimuthal plane. The size reduction is 53.8 per cent as compared to a linear printed monopole antenna.

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7

Kaushik, V. R., and R. K. Gangwar. "A Novel Four Element Low Profile and Compact Conical Dielectric Resonator Antenna for Wideband Applications." Advanced Electromagnetics 7, no. 2 (February 28, 2018): 1–4. http://dx.doi.org/10.7716/aem.v7i2.650.

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In this paper, a four element Conical Dielectric Resonator Antenna fed through coaxial probe is presented. This Low Profile and compact novel Antenna is designed for Wideband application and its input and radiation characteristics determined through the Ansoft High Frequency Structure Simulator (HFSS) Software. The proposed antenna provides wide Bandwidth (45%) and high average gain (5.15 dBi) with Monopole type Radiation Pattern.

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8

Tsukiji, T., Y. Kumon, and M. Yamasaki. "Double-folded monopole antenna using parallel line or coaxial cable." IEE Proceedings - Microwaves, Antennas and Propagation 149, no. 1 (February 1, 2002): 17–22. http://dx.doi.org/10.1049/ip-map:20020181.

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9

Pan, Chien-Yuan, Jhih-Hao Duan, and Jen-Yea Jan. "COPLANAR PRINTED MONOPOLE ANTENNA USING COAXIAL FEEDLINE FOR DTV APPLICATION." Progress In Electromagnetics Research Letters 34 (2012): 21–29. http://dx.doi.org/10.2528/pierl12071301.

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10

FUKUSHIMA, Takatsugu, Naobumi MICHISHITA, Hisashi MORISHITA, and Naoya FUJIMOTO. "Coaxially Fed Antenna Composed of Monopole and Choke Structure Using Two Different Configurations of Composite Right/Left-Handed Coaxial Lines." IEICE Transactions on Communications E102.B, no. 2 (February 1, 2019): 205–15. http://dx.doi.org/10.1587/transcom.2018isp0012.

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11

Zhiwei, Gao, Fang qingyuan, and Jiang shugang. "Research on a Novel Kind of Dual Polarized Stacked Printed Antenna." International Journal of Antennas and Propagation 2018 (November 4, 2018): 1–10. http://dx.doi.org/10.1155/2018/8690308.

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This paper presents a dual polarized antenna with high isolation for a wide-angle scanning phased array radar. For the proposed antenna, the electronic and magnetic resources are realized through a printed monopole antenna and a slot ring antenna, respectively. A metal reflector ground was introduced to achieve the unidirectional pattern, and the ratio of front to back of the pattern was improved. The printed monopole and slot ring antenna are fed by the coaxial and electromagnetic couplings, respectively. The radiation fields emitted by the electronic current resource and magnetic current resource are approximately orthogonal to each other among large space ranges. The measured port isolation of the designed antenna is above 20 dB, and the wide beam performance can be observed. The feasibility of the proposed antenna scheme is verified.

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12

LEE, Young Seung, and Hyo Joon EOM. "An Infinitely Long Monopole Antenna Driven by a Coaxial Cable: Revisited." IEICE Transactions on Communications E94-B, no. 11 (2011): 3140–42. http://dx.doi.org/10.1587/transcom.e94.b.3140.

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13

Wang, Min, and Qing-Xin Chu. "High-Efficiency and Wideband Coaxial Dual-Tube Hybrid Monopole Water Antenna." IEEE Antennas and Wireless Propagation Letters 17, no. 5 (May 2018): 799–802. http://dx.doi.org/10.1109/lawp.2018.2816679.

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14

Shen, Zhongxiang, and Robert H. MacPhie. "Modal expansion analysis of monopole antennas driven from a coaxial line." Radio Science 31, no. 5 (September 1996): 1037–46. http://dx.doi.org/10.1029/96rs01733.

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15

Haykir, Yigit, and Adnan Koksal. "A Novel Singularity-Free Analysis of Coaxial-Fed Thick Monopole Antennas." IEEE Transactions on Antennas and Propagation 63, no. 12 (December 2015): 5860–63. http://dx.doi.org/10.1109/tap.2015.2479636.

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16

Sun, Baohua, Yicai Ji, and Qizhong Liu. "Hybrid MM/MoL approach for analyzing a coaxial FED monopole antenna." Journal of Electronics (China) 19, no. 1 (January 2002): 84–88. http://dx.doi.org/10.1007/s11767-002-0015-1.

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17

Debab, Mohamed, and Zoubir Mahdjoub. "Rectangular Dielectric Resonator Antenna with Single Band Rejection Characteristics." Journal of Telecommunications and Information Technology 1 (March 29, 2019): 76–82. http://dx.doi.org/10.26636/jtit.2019.124718.

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In this paper, a rectangular dielectric resonator antenna (DRA) suitable for wideband applications is presented and a band notch of WLAN (5.15–5.75) GHz is proposed. The DRA is mainly composed of a 20 × 20 mm rectangular dielectric resonator, coated with metal on the top surface, and a circular monopole excitation patch with an air gap insert. A coaxial line feed is used to excite the circular, planar monopole. An open-ended quarter wavelength C-shaped slot is embedded in the circular patch to create the notched band. The simulated results demonstrate that the proposed design produces an impedance bandwidth of more than 80%, ranging from 3.10 to 7.25 GHz for a reﬂection coeﬃcient of less than −10 dB and with a band rejection at 5.50 GHz. Band notch characteristics, VSWR, and radiation patterns are studied using the HFSS high-frequency simulator and CST Studio software.

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18

Chen, Wen-Shan, Chien-Min Cheng, Da-Huei Lee, Chun-Lin Ciou, Wei-Syun Sin, and Guang-Yuan Cai. "Small-Size Meandered Loop Antenna for WLAN Dongle Devices." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/897654.

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This paper proposes a loop-type USB dongle antenna, which is fabricated on a 1.6 mm thick FR-4 substrate for WLAN band systems. The front side of substrate consists of a 50-ohm coaxial line and a multiarm monopole antenna, while the back side has a meandered loop antenna connected to the ground by two via holes. The meandered loop resonates half-wavelength mode at about 2.4 GHz and its higher modes. The higher modes excited by the multiarm monopole form the 5.2 GHz frequency band. The bandwidth of the antenna covers the IEEE802.11 a/b/g WLAN applications. The overall dimensions of the antenna of 30 × 13.75 × 1.6 mm3with an antenna area of 7.5 × 13.75 mm2and a planar structure are exactly suitable for applying in dongle devices. The measured results of radiation patterns, antenna gain, and radiation efficiency are also proposed and discussed in the paper.

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19

Yala, H., and Y. Zebboudj. "Finite-element solution of monopolar corona in a coaxial system." European Physical Journal Applied Physics 19, no. 2 (July 24, 2002): 123–29. http://dx.doi.org/10.1051/epjap:2002058.

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20

Ranjan, Pinku, and Ravi Kumar Gangwar. "Probe Feed Multi-Element Multi-Segment Triangular Dielectric Resonator Antenna with RCS Analysis." Journal of Circuits, Systems and Computers 28, no. 12 (November 2019): 1950208. http://dx.doi.org/10.1142/s0218126619502086.

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The aim of the paper is to propose a design and analysis of multi-element multi-segment triangular dielectric resonator antenna (MEMS TDRA) with Radar Cross-Section (RCS). The proposed antenna has been excited through coaxial probe feed. The coaxial probe feed excites TM[Formula: see text] dominant mode fields within the TDR elements. A general guideline for wide bandwidth and high gain has been prepared for designing of MEMS TDRA. The model of the proposed MEMS TDRA has been studied through simulation (Ansoft HFSS software) and fabricated for measurement. The simulated antenna performance has good agreement with the measured one. The proposed MEMS TDRA performance has been compared with some similar type of previously published structure and found wider bandwidth and higher gain. The proposed MEMS TDRA provides monopole-like radiation pattern with nearly 39% bandwidth ([Formula: see text] dB). The average gain of 6.0 dBi has been found over the entire bandwidth. The RCS analysis has been performed for monostatic and bistatic modes at different frequencies and angles. The proposed antenna is appropriate for WLAN and WiMAX applications.

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21

Banafaa, Mohammed, Mohmed Jamaluddin, Samsul Dahlan, and Ayman Althuwayb. "Miniature Dual Band Button Antenna Using Cylindrical Dielectric Resonator." Applied Computational Electromagnetics Society 36, no. 4 (May 10, 2021): 479–85. http://dx.doi.org/10.47037/2020.aces.j.360415.

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This paper presents miniature dual-band cylindrical dielectric resonator antenna (CDRA) based on button antenna for wireless body area network (WBAN) applications. A button antenna is designed by stacking two CDRAs (low and high permittivity) fed by coaxial probe through the ground plane and penetrates the bottom CDRA. The prime contributions of using DRAs are to enhance the performance and to provide a compact size of antenna. However, the coaxial probe realizes two radiation patterns, monopole and broadside patterns. A comprehensive validation using CST microwave studio is carried out to determine the characteristics of the proposed button antenna. In addition, to ensure that the results are acceptable to the practitioner in this field, a prototype was fabricated and tested. The superiority of the proposed antenna is confirmed by possessing 39% more compact size compared to previously reported studies, efficiency of more than 63% and bandwidth of 4.9% and 6.6% for lower and upper band, respectively. This proposed design is a promising candidate to benefit on/off body communication devices operating at 2.4 and 5.6 GHz.

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22

Morris, M. E., and T. T. Wu. "Admittance of thin, coaxially-driven infinite monopole antennas." Journal of Electromagnetic Waves and Applications 10, no. 5 (January 1996): 643–92. http://dx.doi.org/10.1163/156939396x00577.

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23

Park, M. Y., H. J. Eom, and Y. B. Park. "Coupling between coaxially fed monopoles in a parallel-plate waveguide." IEEE Transactions on Antennas and Propagation 53, no. 9 (September 2005): 3109–12. http://dx.doi.org/10.1109/tap.2005.854546.

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24

Misra, Devendra K. "A study on coaxial line excited monopole probes for in situ permittivity measurements." IEEE Transactions on Instrumentation and Measurement IM-36, no. 4 (December 1987): 1015–19. http://dx.doi.org/10.1109/tim.1987.6312601.

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25

Gangwar, Ravi Kumar, Pinku Ranjan, and Abhishek Aigal. "Wideband four-element two-segment triangular dielectric resonator antenna with monopole-like radiation." International Journal of Microwave and Wireless Technologies 9, no. 2 (November 20, 2015): 411–18. http://dx.doi.org/10.1017/s1759078715001622.

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In this paper, a wideband two-segmented four-element triangular dielectric resonator antenna (TDRA) with coaxial probe feed has been proposed. The proposed antenna has been analyzed, optimized, and studied through Ansoft HFSS simulation software. The prototype of the proposed antenna has been fabricated and its input characteristics are measured with the help of R&S Vector Network Analyzer. Good agreement has been obtained between simulated and measured results. The proposed design has been compared with two segments TDRA and found wider bandwidth with lower resonant frequency. The proposed antenna provides monopole-like radiation pattern over the entire bandwidth with nearly 33% bandwidth (return loss ≥10 dB) at a resonant frequency 6.9 GHz and 4.93 dBi peak gain. The proposed antenna is suitable for application of C-band microwave frequencies.

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26

Wang, Jian, Yin-Shui Xia, and Lun-Yao Wang. "Electromagnetic responses of a metallic conical frustum cabin with one coaxial feeding monopole antenna." International Journal of Applied Electromagnetics and Mechanics 47, no. 3 (March 1, 2015): 765–76. http://dx.doi.org/10.3233/jae-140112.

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27

Deng, Sheng-Ming, Ching-Long Tsai, Sheng-Far Chang, and Sheau-Shong Bor. "Coaxial-fed monopole antenna coupled by dual rectangular ceramic dielectric resonators for wideband operation." Microwave and Optical Technology Letters 46, no. 5 (2005): 500–503. http://dx.doi.org/10.1002/mop.21028.

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28

Park, M. Y., and H. J. Eom. "Analysis of a coaxially fed monopole in a rectangular waveguide." IEEE Microwave and Wireless Components Letters 15, no. 4 (April 2005): 253–55. http://dx.doi.org/10.1109/lmwc.2005.845732.

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29

Liu, Gang, and Craig A. Grimes. "A quasistatic FDTD source model for coaxially driven monopole antennas." Microwave and Optical Technology Letters 26, no. 1 (July 5, 2000): 30–34. http://dx.doi.org/10.1002/(sici)1098-2760(20000705)26:1<30::aid-mop9>3.0.co;2-l.

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30

Do-Nhat, T., and R. H. MacPhie. "The admittance of a monopole antenna fed through a ground plane by a coaxial line." IEEE Transactions on Antennas and Propagation 39, no. 8 (1991): 1243–47. http://dx.doi.org/10.1109/8.97365.

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31

Yang, Ming, Yufa Sun, and Fan Li. "A Compact Wideband Printed Antenna for 4G/5G/WLAN Wireless Applications." International Journal of Antennas and Propagation 2019 (September 10, 2019): 1–9. http://dx.doi.org/10.1155/2019/3209840.

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A compact wideband printed antenna with deca-band 4G/5G/WLAN for mobile phone devices is proposed in this paper. The complete structure is composed of a monopole antenna and a coupling strip, occupying a small C-shape PCB area of 27 × 10.8 mm2. This antenna, which is printed on FR4 substrate with 0.8 mm thickness and fed by a coaxial cable, can provide three wide operating bandwidths that cover 685–1012 MHz, 1596–2837 MHz, and 3288–3613 MHz for 4G/5G/WLAN communication systems. The gains and total radiation efficiencies of the antenna in the low, middle, and high bands are 1.4 dBi–2.5 dBi and 38%–47%, respectively. Besides, the measured results are in good agreement with the simulated results. Further experiments demonstrate that the proposed antenna exhibits a good performance for mobile phones.

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32

INOUE, O., Y. HATTORI, and T. SASAKI. "Sound generation by coaxial collision of two vortex rings." Journal of Fluid Mechanics 424 (November 16, 2000): 327–65. http://dx.doi.org/10.1017/s0022112000002123.

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Sound pressure fields generated by coaxial collisions of two vortex rings with equal/unequal strengths are simulated numerically. The axisymmetric, unsteady, compressible Navier–Stokes equations are solved by a finite difference method, not only for a near field but also for a far field. The sixth-order-accurate compact Padé scheme is used for spatial derivatives, together with the fourth-order-accurate Runge–Kutta scheme for time integration. The results show that the generation of sound is closely related to the change of direction of the vortex ring motion induced by the mutual interaction of the two vortex rings. For the case of equal strength (head-on collision), the change of direction is associated with stretching of the vortex rings. Generated sound waves consist of compression parts and rarefaction parts, and have a quadrupolar nature. For the case of unequal strengths, the two vortex rings pass through each other; the weaker vortex ring moves outside the stronger vortex ring which shows a loop motion. The number of generated waves depends on the relative strength of the two vortex rings. The sound pressure includes dipolar and octupolar components, in addition to monopolar and quadrupolar components which are observed for the case of a head-on collision.

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33

Ramírez-Guzmán, Texar Javier, Citlalli Jessica Trujillo-Romero, Raquel Martínez-Valdez, Lorenzo Leija-Salas, Arturo Vera-Hernández, Genaro Rico-Martínez, Rocío Ortega-Palacios, and Josefina Gutiérrez-Martínez. "Thermal Evaluation of a Micro-Coaxial Antenna Set to Treat Bone Tumors: Design, Parametric FEM Modeling and Evaluation in Multilayer Phantom and Ex Vivo Porcine Tissue." Electronics 10, no. 18 (September 17, 2021): 2289. http://dx.doi.org/10.3390/electronics10182289.

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Bone cancer is rare in adults, the most affected persons by this disease are young people and children. The common treatments for bone cancer are surgery, chemotherapy, and targeted therapies; however, all of them have side-effects that decrease the patient’s quality of life. Thermotherapy is one of the most promising treatments for bone cancer; its main goal is to increase the tumor temperature to kill cancerous cells. Although some micro-coaxial antennas have been used to treat bone tumors, most of them are designed to treat soft tissue. Therefore, the purpose of this work is to analyze the thermal behavior of four micro-coaxial antennas specifically designed to generate thermal ablation in bone tissue to treat bone tumors, at 2.45 GHz. The proposed antennas were the metal-tip monopole (MTM), the choked metal-tip monopole (CMTM), the double slot (DS) and the choked double slot (CDS). The design and optimization of the antennas by using the Finite Element Method (FEM) allow to predict the optimal antenna dimensions and their performance when they are in contact with the affected biological tissues (bone, muscle, and fat). In the FEM model, a maximum power transmission was selected as the main parameter to choose the optimum antenna design, i.e., a Standing Wave Ratio (SWR) value around 1.2–1.5. The four optimized antennas were constructed and experimentally evaluated. The evaluation was carried out in multilayer phantoms (fat, muscle, cortical, and cancellous bone) and ex vivo porcine tissue at different insertion depths of the antennas. To fully evaluate the antennas performance, the standing wave ratio (SWR), power loss, temperature profiles, and thermal distributions were analyzed. In the experimentation, the four antennas were able to reach ablation temperatures (>60 °C) and the highest reached SWR was 1.7; the MTM (power loss around 16%) and the CDS (power loss around 6.4%) antennas presented the lowest SWR values depending on the antenna insertion depth, either in multilayer tissue phantom or in ex vivo tissue. These proposed antennas allow to obtain ablation temperatures with an input power of 5 W after 5 min of treatment; these values are lower than the ones reported in the literature.

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34

Papakanellos, Panagiotis J., and Christos N. Capsalis. "Analysis of coaxially fed monopole antennas using an auxiliary sources technique." Radio Science 37, no. 3 (June 2002): 12–1. http://dx.doi.org/10.1029/2001rs002566.

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35

Kumar, P., and J. L. Masa-Campos. "Dual Polarized Monopole Patch Antennas for UWB Applications with Elimination of WLAN Signals." Advanced Electromagnetics 5, no. 1 (May 1, 2016): 46. http://dx.doi.org/10.7716/aem.v5i1.305.

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This paper presents the design, fabrication and measurement of dual polarized microstrip patch antennas for ultra wideband (UWB) applications with notch at 5-6 GHz band. The proposed antenna rejects the wireless local area network (WLAN) signals and work properly in the entire remaining ultra-wideband. Two antennas are designed for two different frequency bands of ultra wideband and both antennas together produce the entire ultra wideband with notch at 5-6 GHz band. The antennas are fed by a 50 coaxial probe and the entire design is optimized using CST Microwave Studio. The bandwidth of 3.1-5 GHz is achieved by the optimized design of Antenna-1 and the bandwidth of 6 -10.6 GHz is achieved by the optimized design of Antenna-2. The bandwidth of the optimized combined antenna is 3.1-10.6 GHz with elimination of the 5-6 GHz band. Both antennas are simulated, developed and measured. The simulated and measured results are presented. The two designed dual polarized antennas i.e. Antenna-1 and Antenna-2 can be used for 3.1-5 GHz band and 6-10.6 GHz band dual polarized applications, respectively, and the combined antenna structure can be used for UWB dual polarized applications with elimination of 5-6 GHz band signals.

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36

Yung, Edward K. N., Z. M. Xie, R. S. Chen, and Y. F. Han. "The rigorous analysis of a monopole antenna fed by a circumferential slot in a coaxial line." Radio Science 34, no. 3 (May 1999): 615–27. http://dx.doi.org/10.1029/1999rs900004.

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37

Kok Yeow You, Z. Abbas, K. Khalid, and Ngoon Fah Kong. "Improved Formulation for Admittance of Thin and Short Monopole Driving From Coaxial Line Into Dissipative Media." IEEE Antennas and Wireless Propagation Letters 8 (2009): 1246–49. http://dx.doi.org/10.1109/lawp.2009.2035645.

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38

Fukushima, Takatsugu, Naobumi Michishita, Hisashi Morishita, and Naoya Fujimoto. "Coaxially Fed Monopole Antenna With Choke Structure Using Left-Handed Transmission Line." IEEE Transactions on Antennas and Propagation 65, no. 12 (December 2017): 6856–63. http://dx.doi.org/10.1109/tap.2017.2758399.

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39

Park, Mi Y., and Hyo J. Eom. "A series solution for a coaxially fed monopole in a rectangular cavity." AEU - International Journal of Electronics and Communications 69, no. 1 (January 2015): 90–94. http://dx.doi.org/10.1016/j.aeue.2014.07.020.

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40

Thansandote, A., and J. Ponukkha. "Shielded-Open-Coaxial-Linf, and Short-Monopole Reflection Techniques for Measuring Ivioisture Content of Grain and Peanuts." Journal of Microwave Power and Electromagnetic Energy 25, no. 4 (January 1990): 195–201. http://dx.doi.org/10.1080/08327823.1990.11688127.

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41

Bialkowski, M. E., F. K. Schwering, and M. A. Morgan. "On the link between top-hat monopole antennas, disk-resonator diode mounts, and coaxial-to-waveguide transitions [and reply]." IEEE Transactions on Antennas and Propagation 48, no. 6 (June 2000): 1011–14. http://dx.doi.org/10.1109/8.865244.

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42

Tomasic, B., and A. Hessel. "Linear array of coaxially fed monopole elements in a parallel plate waveguide. I. Theory." IEEE Transactions on Antennas and Propagation 36, no. 4 (April 1988): 449–62. http://dx.doi.org/10.1109/8.1133.

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43

Tomasic, B., and A. Hessel. "Linear array of coaxially fed monopole elements in a parallel-plate waveguide. II. Experiment." IEEE Transactions on Antennas and Propagation 36, no. 4 (April 1988): 463–67. http://dx.doi.org/10.1109/8.1134.

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Nasibullaeva, E. Sh. "Investigation of acoustic scattering from a pair soundproof spheres under external influence." Multiphase Systems 14, no. 1 (March 2019): 44–51. http://dx.doi.org/10.21662/mfs2019.1.006.

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A mathematical model extension is presented and numerical studies were made for the problem of acoustic scattering from two soundproof spheres (the case of hard spheres) with an arbitrary acoustic impedance under the action a spherical wave from a monopole radiation source arbitrarily located in space. The case of two spheres is of practical interest, since, on the one hand, the scattered fields from the spheres interact with each other, and on the other hand, the interaction is simple enough for it to be studied in detail. When solving the Helmholtz equations, a numerical technique based on the fast multipole method is used, which allows to achieve high accuracy of the results obtained with minimal computer time. The testing of the algorithm was carried out on the basis of the known data (from the literature) of the response on the surface of one of the spheres in the case when the axis connecting the monopole radiation source and the center of the first sphere is perpendicular to the axis connecting the centers of the two spheres. The pressure distribution around the spheres is investigated for different values of the distance between the centers of the spheres and the arbitrary location of the monopole radiation source in space. It is shown that with certain parameters of the system, the presence of a second sphere can lead to the appearance of an increase or decrease zone of pressure. The obtained results will further allow generalizations of the mathematical model to the cases of acoustic scattering from a pair of sound-permeable spheres (cases of gas bubbles or liquid droplets) and many spheres (both coaxially and arbitrarily arranged in space), and can also be used for test calculations during verification numerical solution of these generalized problems.

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Gangwar, Ravi Kumar, Pinku Ranjan, and Abhishek Aigal. "Four element triangular dielectric resonator antenna for wireless application." International Journal of Microwave and Wireless Technologies 9, no. 1 (May 20, 2015): 113–19. http://dx.doi.org/10.1017/s1759078715000860.

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A wideband four element triangular dielectric resonator antenna (TDRA) has been designed and fabricated by using 50 Ω coaxial probe feed. The input and radiation characteristics of the proposed antenna have been extracted through Ansoft HFSS and CST Microwave Studio simulation software and compared with the experimental results. The simulated results have been in good agreement with the experimental results. The proposed antenna characteristics have also been compared with the same dimensions of the single element TDRA, and found enhancement in bandwidth with lower resonant frequency. Its performance has also been compared with same area (equal to proposed antenna) of single element TDRA. The proposed antenna provides nearly 37% bandwidth (|S11| < −10 dB) at a resonant frequency of 5.45 GHz with 4.76 dBi peak gain. The symmetry and uniformity in the radiation patterns is obtained consistently for the entire operating bandwidth. The proposed antenna shows consistently symmetric monopole type radiation pattern with low cross polarization for WLAN (IEEE 802.16) and WiMAX applications. The performance of the proposed antenna has been compared with some similar type of dielectric resonator antenna (DRA) shapes and it has been observed that TDRA is taking very less radiation area for giving better performance than other DRA shapes.

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Nasibullaeva, E. Sh. "The study of acoustic scattering from a single sound-permeable sphere." Multiphase Systems 13, no. 4 (November 30, 2018): 79–91. http://dx.doi.org/10.21662/mfs2018.4.012.

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The paper presents a generalized mathematical model and numerical investigation of the problem of acoustic scattering from a single sound-permeable sphere during the passage of two types of waves - spherical from a monopole radiation source and a plane one. In solving the Helmholtz equation, a numerical technique based on the fast method of multipoles is used, which allows achieving high accuracy of the results obtained at the lowest cost of computer time. The calculations are compared with known experimental data and a good agreement is obtained. The formulas for calculating the main characteristic of the scattering field (the total scattering cross section) for a sound-permeable sphere are generalized. The effect on this characteristic of the physical parameters of media outside and inside the sphere, such as the density and speed of sound, is shown. A numerical parametric analysis of the pressure distribution around a single sound-permeable sphere for different values of the wave radius, density, and speed of sound of the outer and inner medium of the sphere is carried out. The obtained results will later be used for test verification calculations for the numerical solution of the generalized problem of acoustic scattering of a set of sound-permeable spheres (coaxial or arbitrarily located in space).

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LEE, Young Seung, and Seung Keun PARK. "Mode-Matching Analysis of a Coaxially-Driven Finite Monopole Based on a Variable Bound Approach." IEICE Transactions on Communications E96.B, no. 4 (2013): 994–1000. http://dx.doi.org/10.1587/transcom.e96.b.994.

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Moradpour, Amin, Olympia Karadima, Ivan Alic, Mykolas Ragulskis, Ferry Kienberger, and Panagiotis Kosmas. "Development of a Solid and Flexible Matching Medium for Microwave Medical Diagnostic Systems." Diagnostics 11, no. 3 (March 19, 2021): 550. http://dx.doi.org/10.3390/diagnostics11030550.

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This paper reports the development of a new composite material as a matching medium for medical microwave diagnostic systems, where maximizing the microwave energy that penetrates the interrogated tissue is critical for improving the quality of the diagnostic images. The proposed material has several advantages over what is commonly used in microwave diagnostic systems: it is semi-flexible and rigid, and it can maximize microwave energy coupling by matching the tissue’s dielectric constant without introducing high loss. The developed matching medium is a mirocomposite of barium titanate filler in polydimethylsiloxane (PDMS) in different weight-based mixing ratios. Dielectric properties of the material are measured using a Keysight open-ended coaxial slim probe from 0.5 to 10 GHz. To avoid systematic errors, a full dielectric properties calibration is performed before measurements of sample materials. Furthermore, the repeatability of the measurements and the homogeneity of the sample of interest are considered. Finally, to evaluate the proposed matching medium, its impact on a printed monopole antenna is studied. We demonstrate that the permittivity of the investigated mixtures can be increased in a controlled manner to reach values that have been previously shown to be optimal for medical microwave imaging (MWI) such as stroke and breast cancer diagnostic applications. As a result, the material is a good candidate for supporting antenna arrays designed for portable MWI scanners in applications such as stroke detection.

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Ranjan, Pinku, and Ravi Kumar Gangwar. "Segmented quarter cylindrical dielectric resonator antenna: simulation and experimental investigation in composite form for wideband applications." International Journal of Microwave and Wireless Technologies 9, no. 4 (June 6, 2016): 881–90. http://dx.doi.org/10.1017/s1759078716000714.

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A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenna (q-CDRA) in composite forms have been proposed. The q-CDRA has been introduced by splitting CDRA into four uniform quarters and multi-segmentation approach has been castoff for further improvement in bandwidth of q-CDRA. The dual segments q-CDRA has been designed and analyzed using theoretical analysis and Ansoft HFSS simulation software. Further the dual segment multi-element q-CDRAs in composite form have been designed. A coaxial probe has been placed at the center of the ground plane for the excitation of proposed multi-element and multi-segmented composite form of q-CDRA, which excite TM01δ mode in the proposed antenna. The input characteristics and radiation patterns of the proposed composite antennas have been studied and their results are compared with corresponding experimental results. Prototype of single, two, and four elements dual-segment composite q-CDRAs have been fabricated and input characteristics of the proposed composite antennas have been compared with each other. Four elements dual-segment composite q-CDRA has shown wide impedance bandwidth (|S11| ≤ −10 dB) of 85.13% with monopole-like radiation pattern. The peak gain of 4.85 dBi with 98.5% radiation efficiency has been achieved for dual-segment four elements composite q-CDRA. The proposed multi-element dual-segment composite q-CDRAs may find suitable applications in C and X-band with complete covering of the 5.0 GHZ wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) band.

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Ribner, Herbert S. "Effects of jet flow on jet noise via an extension to the Lighthill model." Journal of Fluid Mechanics 321 (August 25, 1996): 1–24. http://dx.doi.org/10.1017/s0022112096007628.

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The Lighthill formalism for jet noise prediction is extended to accommodate wave transport by the mean jet flow. The extended theory combines the simplicity of the Lighthill approach with the generality of the more complex Lilley approach. There is full allowance for ‘flow-acoustic’ effects: shielding, as well as the refractive ‘cone of (relative) silence’. A source term expansion yielda a convected wave equation that retains the basic Lighthill source term. This leads to a general formula for power spectral density emitted from unit volume as the Lighthill-based value multiplied by a squared ‘normalized’ Green's function. The Green's function, referred to a stationary point source, delineates the refraction dominated ‘cone of silence’. The convective motion of the sources, with its powerful amplifying effect, also directional, is accounted for in the Lighthill factor. Source convection and wave convection are thereby decoupled, in contrast with the Lilley approach: this makes the physics more transparent. Moreover, the normalized Green's function appears to be near unity outside the ‘cone of silence’. This greatly reduces the labour of calculation: the relatively simple Lighthill-based prediction may be used beyond the cone, with extension inside via the Green's function. The function is obtained either experimentally (injected ‘point’ source) or numerically (computational aeroacoustics). Approximation by unity seems adequate except near the cone and except when there are coaxial or shrouding jets: in that case the difference from unity will quantify the shielding effect. Further extension yields dipole and monopole source terms (cf. Morfey, Mani, and others) when the mean flow possesses density gradients (e.g. hot jets).

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