استفاده از ساختارهای باند شکاف الکترومغناطیسی در طراحی، شبیه‌سازی و ساخت آنتن آرایه‌ای چند‌ورودی – چند‌خروجی با قطبش دایروی و مشخصات بهبود‌یافته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه برق، دانشکده فنی مهندسی ، واحد نقده، دانشگاه آزاد اسلامی، نقده، ایران

2 گروه برق، دانشکده فنی مهندسی ، واحد ارومیه، دانشگاه آزاد اسلامی، ارومیه، ایران

چکیده

یک آنتن آرایه ای قطبش دایروی باند وسیع چند ورودی – چند خروجی با شبکه تغذیه 2×4 برای کاربردهای باند C ارائه می‌شود. روش‌های مختلفی در آرایه پیشنهادی جهت بهبود مشخصه‌های آنتنی همچون بهره، پهنای باند نسبت محوری، تطبیق امپدانس و اثرات مخرب تزویج متقابل ارائه می‌شود. برای بهبود بیشتر ویژگی قطبش دایروی یک شبکه تغذیه سلسله مراتبی چند‌ورودی- چند‌خروجی 2×4 برای عریض تر کردن پهنای باند استفاده شده است. علاوه بر آن ویژگی چند ورودی- چند خروجی شبکه تغذیه توانایی کنترل قطبش دایروی راستگرد و چپگرد را دارد. ساختار باند شکاف الکترومغناطیسی برای بهبود عملکرد کلی آرایه طراحی و تحلیل می‌شود. در نهایت شکل خاصی از ساختارهای باند شکاف الکترومغناطیسی به لایه خارجی شبکه تغذیه چند ورودی-چند خروجی اعمال می‌شود که منجر به ایزولاسیون بالا در عناصر تشعشعی و شبکه آرایه ای می‌شود. نتایج اندازه‌گیری به دست آمده از آزمایشگاه آنتن، پهنای باند امپدانسی 6/4 تا 3/7 گیگاهرتز برای درگاه یک و 25/4 تا 2/7 گیگاهرتز در درگاه دو و پهنای باند نسبت محوری 3 دسیبل در درگاه یک 9/4 تا65/6 گیگاهرتز و در درگاه دو 7/4 تا 8/6گیگاهرتز می‌باشند. مقدار بهره اندازه گیری شده با مقدار 3/10دسیبل در فرکانس 6 گیگاهرتز اندازه‌گیری می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Circularly Polarized MIMO Antenna Array with Enhanced Characteristics Using EBG Structure

نویسندگان [English]

  • mahdi jalali 1
  • tohid sedghi 2
1 - Department of Electrical Engineering, Naghadeh Branch, Islamic Azad University, Naghadeh, Iran
2 Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
چکیده [English]

Abstract: A broadband circularly polarized MIMO antenna array with a 2×4 feed network was proposed for C-band application. Different unique techniques were utilized in the proposed array to enhance the antenna characteristics, such as gain, 3dB Axial Ratio Bandwidth (ARBW), impedance tuning, and ruinous mutual coupling effects. For a better improvement of circular polarization features, a 2*4 MIMO Sequentially Rotated (MIMO-SR) feed network was used to achieve broader 3dB ARBW. Besides, the MIMO feature of the feed network could control the left- and right-handed CP, respectively. Moreover, electromagnetic band-gap structure was applied to enhance the overall performance of antenna array. Ultimately, specific forms of slot and slit structures were applied onto the top layer of MIMO feed network that provided a high isolation between the radiating elements and array network. The extracted measured results illustrated an impedance bandwidth of 4.6-7.3 GHz at port 1 and 4.25-7.2 GHz at port 2 for VWSR

کلیدواژه‌ها [English]

  • Circular Polarization
  • MIMO
  • Axial-Ratio
  • Impedance Bandwidth
  • Electromagnetic band-gap structure
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