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طراحی و ساخت آنتن میکرواستریپ با پهنای باند بالا به روش آرایه‌ی متناوب لگاریتمی با تغذیه Inset و Proximity | ||
| الکترومغناطیس کاربردی | ||
| مقاله 5، دوره 4، شماره 3، آبان 1395، صفحه 45-56 اصل مقاله (1.63 M) | ||
| نویسندگان | ||
| جعفر خلیل پور* 1؛ اسماعیل زارع زاده2؛ مریم حاجبی2 | ||
| 1دانشگاه پدافند هوایی خاتم الانبیاء(ص) | ||
| 2دانشگاه صنعتی امیرکبیر | ||
| تاریخ دریافت: 23 مهر 1396، تاریخ بازنگری: 06 اسفند 1397، تاریخ پذیرش: 28 شهریور 1397 | ||
| 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 | ||
| آنتن میکرواستریپ؛ آرایه متناوب لگاریتمی؛ تغذیه Inset؛ تغذیه Proximity؛ تطبیق امپدانسی | ||
| 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 | ||
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