آنتن فرستنده‌ی لورن چهار دکله به صورت تک قطبی با بار بالایی مربعی

فرتوک زاده, مهدی; محسنی ارمکی, سید حسین; رضوی, سید محمد جواد; یاوری, احیائ; راشد محصل, جلیل

آنتن فرستنده‌ی لورن چهار دکله به صورت تک قطبی با بار بالایی مربعی

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه صنعتی مالک اشتر

² دانشگاه تهران

چکیده

در این مقاله روابط تحلیلی مقاومت تشعشعی آنتن‌های چهار دکله‌ی فرستنده‌ی لورن که از سیم های معلق استفاده می کنند، بررسی شده است. با استفاده از این روابط مقاومت تشعشعی آنتن های فرستنده‌ی لورن چند بخشی (SLT) و با بار بالایی مربعی (STL) محاسبه شده و با هم مقایسه شده اند. همچنین امپدانس این آنتن ها به همراه آنتن STL با راکتانس بهبود داده شده با استفاده از روش های عددی ارائه شده است. آنتن نهایی با ارتفاع 100 متر ساخته شده و تصاویر ماهواره ای و زمینی آن ارائه شده است. الگوی تشعشعی زمینی این آنتن با استفاده از مکان یابی GPS و محاسبه ی فاصله ی نقاط اندازه‌گیری از آنتن و جبران آن ها محاسبه شده‌است. الگوی تشعشعی بدست آمده متقارن است و فقط اثرات اشیاء فیزیکی مثل کوه‌ها و ساختمان ها درآن مشاهده می شود. به علاوه امپداس آنتن نیز اندازه گیری شده و تطبیق خوبی با نتایج پیش بینی شده بدست آمد.

کلیدواژه‌ها

20.1001.1.26455153.1394.3.2.5.2

عنوان مقاله [English]

Design and Fabrication of Square Top-Loaded Monopole Antenna as the Loran Transmitter with Four Masts

چکیده [English]

In this paper design method and measurement results of the antennas with square-toploadings (STL) as the
modified versions of sectionalized Loran transmitter (SLT) antennas are presented. An advantage of the
proposed antenna is the improved reactance using additional toploaded wires. Comparison between the
proposed antenna and previous structures indicates that the radiation resistance is multiplied by two and the
realized gain is improved 6 dB. The final structure with 100 m height is fabricated and its photographs are
indicated. The radiation pattern of the realized antenna is obtained by turning around the antenna and
recording the power amplitude. The position of each point is obtained using GPS and the distance differences
are compensated for the radiation pattern. Therefore a symmetrical pattern is obtained and only the effects of
natural objects like mountains or large buildings are observed in the radiation pattern. Finally, the antenna
impedance is measured using vector network analyzer and the predicted results are validated successfully.

کلیدواژه‌ها [English]

Monopole antennas
Small antennas
Wire antennas
Loran system

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