تعیین محل تغذیه و شکل دهی الگوی میدان در آنتن هم موقعیت MIMO با استفاده از تئوری مود مشخصه
محورهای موضوعی : مهندسی برق و کامپیوترمصطفی پروین 1 , جواد احمدی شکوه 2 * , حمیده دشتی خویدکی 3
1 - مهندسی برق و کامپیوتر
2 - دانشگاه سیستان و بلوچستان
3 - دانشگاه سیستان و بلوچستان
کلید واژه: تعیین محل تغذیهمودهای مشخصهدامنه تحریکالگوی میدان دور,
چکیده مقاله :
در این مقاله روشی برای تعیین محل تغذیه در یک آنتن هم‌موقعیت چندورودی- چندخروجی (MIMO) بر مبنای تئوری مود مشخصه ارائه می‌شود. از خاصیت تعامد جریان‌های مشخصه برای تعیین محل‌های بهینه تغذیه در آنتن مورد نظر استفاده می‌شود. ابتدا تحلیل مود مشخصه برای تعیین مودهای رزونانسی متعامد آنتن، انجام و سپس محل‌های بهینه تغذیه برای تحریک این مودها، تعیین می‌شود. همچنین با تغییر دامنه تحریک این مودها، شکل الگوی میدان دور آنتن را تغییر می‌دهیم. مشاهده می‌شود که تنها با تغییر دامنه تحریک مودهای متعامد آنتن و ترکیب آنها در فرکانس مورد نظر، شکل و پهنای پرتوی آنتن تغییر می‌کند.
In this paper, a procedure for feed placement in a collocated Multiple Input Multiple Output (MIMO) antenna is presented based on characteristic mode theory. The orthogonality of characteristic currents is used to determine optimal feed locations in the presented antenna. First, characteristic mode analysis is done to determine the resonance modes of the antenna; Then the optimal feed locations are determined to excite these orthogonal modes. Moreover, we modify the shape of the radiation pattern of the antenna by changing amplitude excitation of these modes. It is observed that only by changing amplitudes of the antenna modes and their composition at the desired frequency, the shape and the beam width of the antenna pattern is changed.
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