آنتن ریز نواری چاپی باند وسیع بارگذاری شده با ساختار AMC پهن‌باند برای سیستم‌های MIMO
الموضوعات :حسین ملک پور شهرکی 1 , علی ابوالمعصومی 2
1 - دانشگاه اراک
2 - دانشگاه اراک
الکلمات المفتاحية: آنتن چاپی, رسانای مغناطیسی ساختگی (AMC), پهن‌باند, WLAN, WiMAX,
ملخص المقالة :
در این مقاله یک آنتن چاپی پهن‌باند روی سطح رسانای مغناطیسی ساختگی ارائه شده که می‌توان از آن در کاربردهای بی‌سیم مانند WLAN، WiMAX و سیستم‌های چندین ورودی و چندین خروجی (MIMO) استفاده کرد. در ساختار پیشنهادی، سطح رسانای مغناطیسی ساختگی (AMC) مسطح به عنوان صفحه زمین برای یک‌طرفه شدن الگوی این آنتن و افزایش پهنای باند امپدانسی استفاده شده است. طرح آنتن پیشنهادی از دو المان ریز نوار چاپی تغذیه‌شده به وسیله یک خط میکرواستریپی E شکل برای تزویج المان‌های چاپی تشکیل گردیده است. پهنای باند آنتن ساخته‌شده از 94/4 تا 9/6 گیگاهرتز در محدوده موج برگشتی حدود 10- دسی‌بل برای قطبش خطی در باند C را شامل می‌شود. سلول واحد AMC لوزی‌شکل، پهنای باند 24/5 تا 15/7 گیگاهرتز برای فاز بازتابی 90± درجه را نشان می‌دهد. با اضافه‌کردن سطح AMC به آنتن چاپی، یک ساختار پهن‌باند با کوچک‌سازی قابل قبول و افزایش بهره تا dBi 25/7 به دست می‌آید. نتایج شبیه‌سازی خواص امپدانسی آنتن به وسیله نرم‌افزارهای تمام موج HFSS و CST انجام گرفته است. همچنین، آرایه دوالمانه از طرح پیشنهادی برای قطبش‌های مختلف مورد بررسی قرار گرفته است. بر اساس نتایج به دست آمده، پهنای باند کاری محدوده فرکانسی 18/5 تا 81/6 گیگاهرتز را در بر می‌گیرد و جداکنندگی بین عناصر آرایه کمتر از dB 22- است. به همین منظور، آرایه آنتن‌ها می‌تواند برای سیستم‌های MIMO مورد استفاده قرار گیرد.
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