آنتن دوقطبی متعامد دارای المان‌های پارازیتیک ترنج شکل با قابلیت قطبش دایروی و کاربرد در سیستم موقعیت‌یاب جهانی
الموضوعات :
1 - استادیار، گروه برق، واحد سلماس، دانشگاه آزاد اسلامی، سلماس، ایران
الکلمات المفتاحية: آنتن دوقطبی متعامد, المان پارازیتیک, سیستم موقعیت¬یاب جهانی, قطبش دایروی.,
ملخص المقالة :
این مقاله یک آنتن دوقطبی چاپی متعامد با قطبش دایروی برای گیرنده¬های سیستم موقعیت¬یاب جهانی (Global Positioning System) در باند L1 (1575 مگاهرتز) را ارائه می‌دهد. ساختار آنتن متشکل از دو عدد دوقطبی چاپی است که بصورت متعامد نسبت به یکدیگر قرار گرفته‌اند و شامل دو بالن یکپارچه برای تغذیه دوقطبی‌ها و یک شبکه تغذیه متصل به بالن‌ها است. در این طراحی، شبکه تغذیه از یک تزویجگر شاخه‌ای (Branch-Line Coupler) با دو خروجی مربعی (Quadrature Outputs) تشکیل یافته است. بر این اساس، تغذیه دو دوقطبی متعامد با اختلاف فاز 90 درجه منجر به قطبش دایروی راست‌گرد می‌شود که برای کاربردهای سیستم موقعیت¬یاب جهانی امری الزامی است. با هدف بهبود قطبش دایروی آنتن، از چهار عدد المان پارازیتیک ترنج شکل در قسمت فوقانی بازوهای دوقطبی استفاده شده است. طبق نتایج عملی به دست آمده با تکنیک بکار گرفته‌شده، پهنای باند نسبت محوری (Axial Ratio) آنتن در حدود 21% افزایش یافته و هم‌زمان خلوص قطبش دایروی آنتن نیز بهبود قابل ملاحظه‌ای داشته است. نتایج تجربی تأیید می‌کنند که آنتن پیشنهادی برای سیستم موقعیت¬یاب جهانی دارای پهنای باند امپدانسی 28/46% (از 327/1 تا 126/2 گیگاهرتز)، پهنای باند نسبت محوری 36/41% (از 329/1 تا 022/2 گیگاهرتز) و حداکثر بهره 40/6 دسی¬بل است. ابعاد آنتن پیشنهادی کوچک بوده و این آنتن دارای الگوی تشعشعی پایداری است. در گام آخر آنتن پیشنهادی برای سیستم موقعیت¬یاب جهانی در آزمایشگاه آنتن ساخت و تست شده است.
In this research, a new design of orthogonal printed dipole antennas with circular polarization is presented.
This antenna is useful for use in global positioning system receivers in the 1575 MHz band.
In this design, four Torang-shaped parasitic elements are used to improve the circular polarization of the antenna.
According to the practical results obtained with the used technique, the bandwidth of the axial ratio of the antenna has increased by about 21%.
The purity of the circular polarization of the antenna has been significantly .improved by using the Torang-shaped parasitic elements
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