آنتن دوقطبی متعامد دارای المان‌های پارازیتیک ترنج شکل با قابلیت قطبش دایروی و کاربرد در سیستم موقعیت‌یاب جهانی
محورهای موضوعی : مهندسی مخابرات
1 - استادیار، گروه برق، واحد سلماس، دانشگاه آزاد اسلامی، سلماس، ایران
کلید واژه: آنتن دوقطبی متعامد, المان پارازیتیک, سیستم موقعیت¬یاب جهانی, قطبش دایروی.,
چکیده مقاله :
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.
This paper presents a circularly polarized (CP) printed crossed-dipole antenna for Global Positioning System (GPS) receptions in the L1 (1575 MHz) band. Its structure consists of two orthogonally printed dipoles, two integrated baluns to feed the dipoles, and a feed network connected to the baluns. The feeding network comprises a Branch-Line Coupler with two quadrature outputs. Accordingly, providing two orthogonal dipoles with a 90-degree phase difference leads to right-handed circular polarization (RHCP), a must for GPS applications. Four Torang-shaped parasitic elements have been used in the upper part of the dipole arms to improve the circular polarization of the antenna. Based on the practical results obtained with the technique, the antenna's Axial Ratio (AR) bandwidth is increased by about 21%. At the same time, the purity of the circular polarization can also be seen. The experimental results show that the proposed GPS antenna has an impedance bandwidth of 46.28% (from 1.327 to 2.126 GHz), an axial ratio bandwidth of 41.36% (from 1.329 to 2.022 GHz), and a maximum gain of 6.40 dB. The dimensions of the proposed antenna are compact, and this antenna has a stable radiation pattern. In the last step, the proposed GPS antenna is fabricated and tested in the antenna laboratory.
در این تحقیق یک طراحی جدید از آنتن‌های دوقطبی چاپی متعامد با قطبش دایروی ارائه شده است.
این آنتن جهت استفاده در گیرنده‌های سیستم موقعیت یاب جهانی در باند 1575 مگا هرتز کاربردی است.
در این طراحی جهت بهبود قطبش دایروی آنتن، از چهار المان پارازیتیک ترنج شکل استفاده شده است.
طبق نتایج عملی بدست آمده با تکنیک بکار گرفته شده، پهنای باند نسبت محوری آنتن در حدود 21% افزایش یافته است.
خلوص قطبش دایروی آنتن نیز با استفاده از تکنیک المان های پارازیتیک ترنج شکل، بهبود قابل ملاحظه‌ای داشته است.
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JOURNAL OF Southern COMMUNICATION ENGINEERING Islamic Azad University Bushehr Branch |
E-ISSN: 2980-9231 https://jce.bushehr.iau.ir |
https://doi.org/... |
Vol. 13/ No.52/Summer 2024
Research Article |
The Crossed-Dipole Antenna with Torang-shaped Parasitic Elements and Circular Polarization for GPS Application
Amir Siahcheshm, Assistant Professor1* 
1Assistant Professor, Department of Electrical Engineering, Salmas Branch, Islamic Azad University, Salmas, Iran, amir.siahcheshm@iau.ac.ir
Correspondence Amir Siahcheshm, Assistant Professor, Department of Electrical Engineering, Salmas Branch, Islamic Azad University, Salmas, Iran, amir.siahcheshm@iau.ac.ir |
Abstract
Received: 26 November 2023 Revised: 22 December 2023 Accepted: 20 January 2024
|
Keywords: Crossed Dipole Antenna, Parasitic Element, Circular Polarization, GPS.
Highlights
· 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.
Citation: (in Persian).