مروری جامع بر سنتز آرایههای آنتن خطی و صفحهای
محورهای موضوعی : مهندسی برق و کامپیوترعلی پسرک لو 1 , محمد خلج امیرحسینی 2
1 - دانشكده مهندسي برق و كامپيوتر، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
2 - دانشکده مهندسی برق، دانشگاه علم و صنعت ایران، تهران، ایران
کلید واژه: آرایه آنتن, سنتز پترن تشعشعی, آرایه با فاصله¬گذاری یکنواخت, آرایه با فاصله-گذاری غیر یکنواخت.,
چکیده مقاله :
آرایه آنتن از کنار هم قرار دادن یک مجموعه از عناصر تشعشعی در یک ساختار هندسی مشخص بهدست میآید و ویژگیهای خاصی را ایجاد میکند که آنتنهای معمول، قادر به انجام آن ها نیستند. از جملهی این ویژگی ها قابلیت پویش پترن تشعشعی، پترنهای تشعشعی با سمتگرایی بالا و پترنهای تشعشعی با شکلهای دلخواه میباشند. برای طراحی آرایههای آنتنی سه راهبرد کلی وجود دارد: تعیین دامنههای جریان تحریک، تعیین فاز جریانهای تحریک و تعیین فاصلهی بین عناصر. برای هر کدام از این راهبردها تاکنون روشهای سنتز پترن متفاوتی ارائه شده است.
در سنتز پترنهای پهلوآتش، روشهای سنتز متعارفی که بر اساس تنها تعیین دامنه ی تحریک عناصر هستند عبارتند از تحریک یکنواخت برای دستیابی به حداکثر سمتگرایی ممکن و تحریک چبیشف و تیلور برای دستیابی به حداقل سطح گلبرگ کناری (SLL)به ازای پهنای بیم نصف توان (HPBW) مشخص. اخیرا برای دستیابی به پترنهای پهلوآتش با حداکثر سمتگرایی همراه با کنترل SLL یا HPBW، روش های سنتز تحلیلی جدیدی ارائه شده است که در بخش اول، که راهبرد تعیین دامنهی تحریک عناصر میباشد به بیان آنها پرداخته و با روشهای مرسوم چبیشف و تحریک یکنواخت مقایسه شدهاند.
برای دستیابی به پترنهای با شکل دلخواه و نامتقارن، روش متعارف، تعیین توام دامنه و فاز تحریک عناصر می باشد. اما پیادهسازی این نوع تحریک، بسیار پیچیده و پرهزینه است. اخیرا در مقالات روشهای سنتز پترنهای نامتقارن با استفاده از تعیین تنها فاز تحریک عناصر ارائه شده است که در بخش دوم به بررسی این روش ها و نقاط قوت و ضعف آنها پرداخته شده است.
در سالهای اخیر روش جدیدی برای سنتز پترن های پهلوآتش با سطح گلبرگ کناری معین ارائه شده است که در آن به جای وزندهی دامنهی تحریک عناصر، وزندهی بر روی فاصلهی بین عناصر انجام شود که به این آرایهها، آرایههای با فاصلهگذاری غیر یکنواخت میگویند و از ویژگی سادگی در پیادهسازی برخوردار است. در بخش سوم به بررسی روشهای سنتز این نوع آرایهها پرداخته میشود و مقایسهای بین آنها و آرایههای با فاصلهگذاری یکنواخت انجام شده و نقاط قوت و ضعف آنها بیان میشود.
An antenna array is created by assembling a set of radiating elements in a specific geometric structure, enabling unique features that conventional antennas cannot achieve. These features include the ability to scan radiation patterns, patterns with high directivity, and patterns with arbitrary shapes. Three general strategies are used for designing antenna arrays: determining excitation current amplitudes, excitation current phases, and the distance between elements. Various pattern synthesis methods have been proposed for each of these strategies.
In the synthesis of broadside radiation patterns, traditional methods focus on determining the excitation amplitude of elements. These methods include uniform excitation for maximum directivity and Chebyshev and Taylor excitation for minimizing the Side Lobe Level (SLL) for a specific Half-Power Beam Width (HPBW). Recently, new analytical synthesis methods have been introduced to achieve broadside patterns with maximum directivity, SLL, or HPBW control. The first part of this process, concentrating on determining the excitation amplitude strategy, explains these methods and compares them to traditional Chebyshev and uniform excitation methods.
To generate patterns with arbitrary and asymmetric shapes, the conventional approach involves determining both the excitation amplitude and phase of elements. However, implementing such excitation is intricate and costly. Recent articles have presented methods for synthesizing asymmetric patterns by solely determining the excitation phase of elements. In the second part, these methods are scrutinized along with their strengths and weaknesses.
A novel method has recently emerged for synthesizing broadside patterns with a specified Side Lobe Level. Instead of adjusting the excitation amplitude of elements, this method focuses on the distance between elements. These arrays, termed non-uniformly spaced arrays, are known for their straightforward implementation. The third part explores the synthesis methods of these arrays, comparing them to uniformly spaced arrays and outlining their advantages and disadvantages.
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