طراحی و ساخت آنتن میکرواستریپ با پهنای باند بالا به روش آرایه‌ی متناوب لگاریتمی با تغذیه Inset و Proximity

خلیل پور, جعفر; زارع زاده, اسماعیل; حاجبی, مریم

طراحی و ساخت آنتن میکرواستریپ با پهنای باند بالا به روش آرایه‌ی متناوب لگاریتمی با تغذیه Inset و Proximity

نویسندگان

¹ دانشگاه پدافند هوایی خاتم الانبیاء(ص)

² دانشگاه صنعتی امیرکبیر

چکیده

در این مقاله برای افزایش پهنای باند آنتن‌های میکرواستریپی، از آرایه‌های متناوب لگاریتمی استفاده شده است و برای تغذیه آرایه‌ها نیز روش‌های تغذیه‌ی ‌Inset و Proximity انتخاب شدند. شبیه‌سازی‌ها و نتایج آزمایشگاهی نشان دادند که با استفاده از تغذیه Inset پهنای باند افزایش یافته و تطبیق امپدانسی بهتر از ترمینال ورودی حاصل می‌شود. بعلاوه با استفاده از تغذیه Proximity به دلیل حذف اتصالات T شکل و لحیم‌کاری‌ها، تشعشعات ناخواسته از بین رفته و در نتیجه بهره و پهنای باند بیشتر و ابعاد کوچکتری نسبت به آنتن با تغذیه Inset به دست می‌آید. در این مقاله از یک ماده دی‌الکتریک از جنس FR4 با ضخامت mm6/1 و ثابت دی‌الکتریک 4/4ε_r= استفاده شده است و فرکانس تشدید و امپدانس مشخصه خط تغذیه به ترتیب GHz 03/3 و Ω50 در نظر گرفته شده‌اند. با استفاده از آرایه متناوب لگاریتمی، پهنای‌باند امپدانسی و بهره‌ی آنتن میکرواستریپ به ترتیب از %7/2 و حدودdB 2 برای تک المان، به %4/27 وdB 8 برای 5 المان افزایش می یابد.

کلیدواژه‌ها

20.1001.1.26455153.1395.4.3.5.1

عنوان مقاله [English]

Numerical Modelling for AC Loss of the Second Generation HTS Tapes Under Alternating External Magnetic Fields Using the Finite Element Method ‎

چکیده [English]

Superconductivity is one of the most advanced technologies to use in technical applications especially in
electrical engineering applications. This technology is of great interest in R&D stage to fabricate electrical
power arraratus because of promising features such as higher efficiency, lower loss, better reliability, smaller
size and compact assembly compared with conventional electrical components. The most important properties of
high temperature superconducting (HTS) tapes are large current density, high power density and very low AC
loss. Yttrium-based second generation HTS tapes have got 100 times higher current density and 20 times higher
price compared with conventional copper wires. The most important limitation on application of
superconducting technology in power applications is AC loss of the HTS tapes. Many methods have been
developed during last decay in order to measure, estimate and calculate the AC loss of the HTS wires. One of the
low-cost, fast, and precise approaches is numerical modelling methods. In this paper, a numerical model for
yttrium-based second generation HTS tapes has been developed in order to calculate AC loss in transport
current mode and under external magnetic fields using the H-formaulation finite element method. The
dependency of the current density of tape to magnetic field has been considerd in the model.

کلیدواژه‌ها [English]

Microstrip Antenna
log-periodic array
Inset feed
Proximity feed
impedance matching

مراجع

[1] X. Yang, X. Li, Y. He, X. Wang, and B. Xu, “Investigation on stresses of superconductors under pulsed magnetic fields based on multiphysics model,” Physica C: Superconductivity and its applications, vol. 535, pp. 1-8, 2017.

[2] B. G. Marchionini, Y. Yamada, L. Martini, and H. Ohsaki, “High Temperature Superconductivity: A Roadmap for Electric Power Sector Applications, 2015-2030,” IEEE Transactions on Applied Superconductivity, vol. 27, no. 4, pp. 1-6, 2017.

[3] S. Fukui, S. Tsukamoto, K. Nohara, J. Ogawa, T. Sato, and T. Nakamura, “Study on AC Loss Reduction in HTS Coil for Armature Winding of AC Rotating Machines,” IEEE Transactions on Applied Superconductivity, vol. 26, no. 4, pp. 1-5, 2016.

[4] X. Obradors and T. Puig, “Coated conductors for power applications: materials challenges,” Superconductor Science and Technology, vol. 27, pp. 1-17, 2014.

[5] S. Stavrev, F. Grilli, B. Dutoit, N. Nibbio, E. Vinot, I. Klutsch, G. Meunier, P. Tixador, Y. Yang, and E. Martinez, “Comparison of numerical methods for modeling of superconductors,” IEEE Transactions on Magnetics, vol. 38, no. 1, pp. 849-852, 2002.

[6] A. M. Campbell, “A direct method for obtaining the critical state in two and three dimensions,” Superconductor Science and Technology, vol. 22, pp. 1-8, 2009.

[7] S. Stavrev, F. Grilli, B. Dutoit, and S. P. Ashworth, “Comparison of the AC losses of BSCCO and YBCO conductors by means of numerical analysis,” Superconductor Science and Technology, vol. 18, no. 10, pp. 1300-1312, 2005.

[8] Y. Ichiki and H. Ohsaki, “Numerical analysis of ac loss characteristics of YBCO coated conductors arranged in parallel,” IEEE Transactions on Applied Superconductivity, vol. 15, no. 2, pp. 2851-2854, 2005.

[9] V. M. Rodriguez-Zermeno, N. Mijatovic, C. Traholt, T. Zirngibl, E. Seiler, A. B. Abrahamsen, N. F. Pedersen, and M. P. Sorensen, “Towards Faster FEM Simulation of Thin Film Superconductors: A Multiscale Approach,” IEEE Transactions on Applied Superconductivity, vol. 21, no. 3, pp. 3273-3276, 2011.

[10] A. Stenvall, V. Lahtinen, and M. Lyly, “An H-formulation-based three-dimensional hysteresis loss modelling tool in a simulation including time varying applied field and transport current: the fundamental problem and its solution,” Superconductor Science and Technology, vol. 27, no. 10, pp. 1-7, 2014.

[11] Z. Hong and T. A. Coombs, “Numerical Modelling of AC Loss in Coated Conductors by Finite Element Software Using H Formulation,” Journal of Superconductivity and Novel Magnetism, vol. 23, no. 8, pp. 1551-1562, 2010.

[12] M. D. Ainslie, T. J. Flack, Z. Hong, and T. A. Coombs, “Comparison of first- and second-order 2D finite element models for calculating AC loss in high temperature superconductor coated conductors,” COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 30, no. 2, pp. 762-774, 2011.

[13] G. Escamez, A. Badel, P. Tixador, B. Ramdane, G. Meunier, A. Allais, and C. E. Bruzek, “Numerical Modelling of AC Hysteresis Losses in HTS Tubes,” IEEE Transactions on Applied Superconductivity, vol. 25, no. 3, pp. 1-5, 2015.

[14] S. Li, D. X. Chen, Y. Fan, and J. Fang, “Transport ac loss in a rectangular thin strip with power-law E(J) relation,” Physica C: Superconductivity and its applications, vol. 508, pp. 12-16, 2015.

[15] D. X. Chen, S. Li, and J. Fang, “Scaling law and general expression for transport ac loss of a rectangular thin strip with power-law E(J) relation,” Physica C: Superconductivity and its applications, vol. 519, pp. 89-94, 2015.

[16] V. M. R. Zermeno, K. Habelok, M. Stepien, and F. Grilli, “A parameter-free method to extract the superconductor’s Jc(B,θ) field-dependence from in-field current–voltage characteristics of high temperature superconductor tapes,” Superconductor Science and Technology, vol. 30, no. 3, pp. 1-7, 2017.

[17] F. Gomory, M. Vojenciak, E. Pardo, M. Solovyov, and J. Souc, “AC losses in coated conductors,” Superconductor Science and Technology, vol. 23, no. 3, pp. 1-9, 2010.

[18] F. Grilli, E. Pardo, A. Stenvall, D. N. Nguyen, W. Yuan, and F. Gomory, “Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents,” IEEE Transactions on Applied Superconductivity, vol. 24, no. 1, pp. 1-33, 2014.

[19] X. Pei, A. C. Smith, M. Barnes, “AC Losses Measurement and Analysis for a 2G YBCO Coil in Metallic Containment Vessels,” IEEE Transactions on Applied Superconductivity, vol. 27, no. 4, pp. 1-5, 2017.

[20] J. H. Kim, C. H. Kim, G. Iyyani, J. Kvitkovic, and S. Pamidi, “Transport AC Loss Measurements in Superconducting Coils,” IEEE Transactions on Applied Superconductivity, vol. 21, no. 3, pp. 3962-3972, 2011.

[21] C. M. Rey, R. C. Duckworth, S. W. Schwenterly, and E. Pleva, “Electrical AC Loss Measurements on a 2G YBCO Coil,” IEEE Transactions on Applied Superconductivity, vol. 21, no. 3, pp. 2424-2427, 2011.

[22] L. Queval, V. M. R. Zermeno, and F. Grilli, “Numerical models for ac loss calculation in large-scale applications of HTS coated conductors,” Superconductor Science and Technology, vol. 29, no. 2, pp. 1-10, 2016.

[23] R. Brambilla, F. Grilli, L. Martini, and F. Sirois, “Integral equations for the current density in thin conductors and their solution by the finite-element method,” Superconductor Science and Technology, vol. 21, no. 10, pp. 1-8, 2008.

[24] D. N. Nguyen, S. P. Ashworth, and J. O. Willis, “Experimental and finite-element method studies of the effects of ferromagnetic substrate on the total ac loss in a rolling-assisted biaxially textured substrate YBa2Cu3O7 tape exposed to a parallel ac magnetic field,” Journal of Applied Physics, vol. 106, no. 9, pp. 1-7, 2009.

[25] Y. Wang, H. Song, W. Yuan, Z. Jin, and Z. Hong, “Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil,” Journal of Applied Physics, vol. 121, no. 11, pp. 1-16, 2017.

[26] B. Shen, J. Li, J. Geng, L. Fu, X. Zhang, H. Zhang, C. Li, F. Grilli, and T. A. Coombs, “Investigation of AC losses in horizontally parallel HTS tapes,” Superconductor Science and Technology, vol. 30, no. 7, pp. 1-9, 2017.