گسترش پهنای پرتو آنتن آرایه‌ای مایکرواستریپ به کمک لایه‌های تطبیق امپدانس زاویه گسترده

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی مالک اشتر

چکیده

در این مقاله یک روش جدید برای محاسبه ضریب انعکاس فعال آنتن‌های آرایه-ای ارائه شده‌است و به کمک آن، لایه تطبیق امپدانس ناهمسانگرد جهت انتقال نقاط کور طراحی شده‌است. آنتن طراحی شده شامل یک آرایه‌ی مایکرواستریپ با چیدمان مستطیلی بوده که فاصله بین عناصر آن برابر 63/0 طول موج در باند فرکانسی X می‌باشد. جهت جبران عدم تطبیق امپدانس بین آنتن و فضای آزاد بالای دریچه در نزدیکی نقاط کور و همچنین افزایش بازه پویش آنتن، با استفاده از روش بهینه‌سازی الگوریتم ژنتیک، مشخصات لایه تطبیق ناهمسانگرد استخراج می‌شود. سپس در نرم‌افزارهایCST MICROWAVE STUDIO@2016 و HFSS کارآمدی آن بررسی می‌گردد. از مزایای روش پیشنهادی نسبت به سایر روش‌ها می‌توان به سادگی، سرعت بالاتر، عدم نیاز به ساخت و اندازه‌گیری ضرایب تزویج آنتن اشاره کرد. این روش، یک ابزار قوی برای محاسبه ضریب انعکاس فعال آنتن‌های آرایه‌ای مایکرواستریپ ،که استخراج معادلات تحلیلی برای آن-ها دشوار است، به حساب می‌آید. لایه تطبیق امپدانس زاویه گسترده طراحی شده با انتقال نقاط کور سبب افزایش بازه پویش آنتن از °34± به °42± شده-است.

کلیدواژه‌ها


عنوان مقاله [English]

Beam width expansion of microstrip array antenna by wide angle impedance matching layer

نویسندگان [English]

  • mahboube Safari Dehnavi
  • sayed mohammad javad razavi
  • S. Hossein Mohseni Armaki
malek ashtar university of technology
چکیده [English]

In this paper, a new method for calculation the active reflection coefficient of an array antenna has been proposed, and accordingly an anisotropic wide angle impedance matching layer has been designed to mitigate blind spots. The designed antenna consists of a microstrip array with rectangular arrangement. The space between the elements in the mentioned array is equal with 0.63 wavelength in X band. In order to compensate the impedance mismatch near the blind spots between the antenna and the free space above the aperture and also to increase the antenna scan range, the anisotropic matching layer characteristics are extracted by genetic algorithm optimization method. Finally, its efficiency is investigated in CST Microwave Studio and HFSS software. Compared with other similar techniques, the proposed method is simpler, faster, and does not require to fabricate and coupling coefficients measurement. It is a powerful tool for deriving the active reflection of microstrip array antenna that is difficult to extract their analytical equations. The designed wide-angle impedance matching layer has increased the scan range of antenna from ±34° to ±42° by shifting blind spots.

کلیدواژه‌ها [English]

  • Microstrip array antenna
  • Blind spots
  • X band
  • Optimization
  • WAIM
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