حذف تزویج متقابل دو آرایه آنتن پچ هم‌فرکانس با استفاده از پوشش فراسطحی برای کاربردهای چرخش پرتو

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی برق و کامپیوتر، دانشگاه تبریز، تبریز، ایران

2 گروه مخابرات، دانشکده برق و کامپیوتر، دانشگاه تبریز، تبریز، ایران

چکیده

در این مقاله، روش پوشش صفحه‌ای برای حذف تزویج متقابل دو آرایه آنتن پچ فشرده هم‌فرکانس و با قطبش‌های متعامد به کار رفته‌است. ابعاد پچ‌ها با قرار دادن دو شکاف در لبه‌های رزونانسی نسبت به پچ معمولی 33% کاهش یافته تا فاصله بین المان‌ها کمتر شده و امکان چرخش پرتو فراهم شود. برای کاهش تزویج متقابل قوی بین المان‌ها، یک پوشش فراسطح نازک روی سطوح بالا و پایین پچ‌ها قرار می‌گیرند. پوشش فراسطحی در فرکانس کار موردنظر راکتانس خازنی از خود نشان داده و راکتانس سلفی ناشی از جریانهای القایی از پچ‌های مجاور را حذف می‌کند، در نتیجه المان‌های دو آرایه نسبت به هم نامرئی می‌شوند. عملکرد ساختار پوشش پیشنهادی با شبیه‌سازی تمام‌موج از نظر مشخصات تشعشعی آرایه‌ها ارزیابی شده است. بازده آرایه‌ها بعد از افزودن پوشش‌ نسبت به حالت بدون پوشش 35% افزایش یافته و ایزولاسیون بین عناصر بیش از dB  24 در فرکانس کار بهبود یافته‌است. الگوهای تشعشعی نیز در حالت پوشش‌دار 98.5% نسبت به آرایه‌های مجزا از هم مشابهت نشان می‌دهد. مقادیر بهره آنتن‌ها در حالت پوشش‌دار، در آرایه I و II به ترتیب تنها  dB 0.1 و dB  0.2 کاهش و سطح لوبهای فرعی نیز به ترتیبdB  0.5و  dB 0.2 نسبت به حالت مجزا از هم افزایش نشان می‌دهد. نتایج حاصل، موفقیت طرح پوشش پیشنهادی در بازیابی ویژگی‌های تشعشعی آرایه‌های درهم تنیده مشابه آرایه‌های مجزا از هم را تایید می‌کنند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Decoupling of Two Co-Frequency Small Patch Array Antennas Using Meta surface Mantle Cloaking for Beam Steering Applications

نویسندگان [English]

  • R. Masoumi 1
  • R. Kazemi 2
1 Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
2 Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
چکیده [English]

In this study, the mantle cloaking method is utilized to eliminate strong mutual coupling between two compact co-frequency patch antenna arrays with orthogonal polarizations. The patches are reduced in size by 33% through the addition of two slots on the resonant edges, allowing a reduction in distance between elements and enabling beam steering. To mitigate the destructive effects of mutual coupling between elements, a thin metasurface cloak is placed on the top and bottom surfaces of the patches. The metasurface cloak exhibits capacitive reactance at the desired operating frequency and eliminates the inductive reactance caused by induced currents from adjacent patches, making the elements of the two arrays invisible to each other. Full-wave simulation is used to evaluate the performance of this cloak structure in terms of array radiation characteristics. Results show that adding the cloak increased array efficiency by 35% compared to the uncloaked case, with isolation between elements improving by over 24 dB at the operating frequency. Radiation patterns in the cloaked case demonstrate a 98.5% similarity to those of isolated arrays. The antenna gains in the cloaked case slightly decreased by 0.1 dB and 0.2 dB for arrays I and II, respectively, and the sidelobe levels increased by 0.5 dB and 0.2 dB compared to isolated arrays. These findings confirm that this metasurface cloak design successfully restores radiation characteristics of tightly coupled arrays similar to those of isolated arrays.

کلیدواژه‌ها [English]

  • Decoupling of antennas
  • anisotropic mantle cloaking
  • meta surface elliptical cloak
  • beam steering
  • polarization isolation

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