آنتن ریز نواری چاپی باند وسیع بارگذاری شده با ساختار AMC پهن‌باند برای سیستم‌های MIMO
محورهای موضوعی : مهندسی برق و کامپیوتر
حسین ملک پور شهرکی
1
(دانشگاه اراک)
علی ابوالمعصومی
2
(دانشگاه اراک)
کلید واژه: آنتن چاپی, رسانای مغناطیسی ساختگی (AMC), پهن‌باند, WLAN, WiMAX,
چکیده مقاله :
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.
In this paper, a wideband printed antenna over an artificial magnetic conductor (AMC) surface is introduced which can be utilized for wireless applications such as WLAN, WiMAX, and multiple-input multiple-output (MIMO) systems. In the proposed structure, a planar AMC surface as the antenna ground plane is used to direct the radiation pattern of the antenna, and enhancing the impedance bandwidth. The proposed antenna design is composed of a pair of printed microstrip elements fed by an E-shape feed line for coupling the elements. The bandwidth of the designed antenna includes from 4.94 GHz to 6.9 GHz with a return loss of less than -10dBforlinear polarization in C-band. The rhombic-shape AMC unit cell indicates the bandwidth of 5.24-7.15 GHz for the ±90˚ reflection phase. By adding the AMC surface into the printed antenna, a wideband structure with acceptable miniaturization and gain enhancement to 7.25 dBi is achieved. The simulated results of the antenna’s impedance properties are performed by using full-wave simulators of HFSS and CST. Also, two-element array of the proposed design are investigated for different polarizations. Based on the obtained results, the operating bandwidth includes the frequency range from5.18GHz to 6.81 GHz and the isolation between the array elements is less than -22 dB. For this purpose, the antenna arrays can be applied for MIMO systems.
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