مراجعة حول تقنيات تحسين عرض النطاق الترددي في هوائيات النطاق العريض جدًا (UWB)
محتوى المقالة الرئيسي
الملخص
أصبحت هوائيات النطاق العريض جدًا (UWB) مكوّنًا أساسيًا في التطبيقات اللاسلكية المتقدمة نظرًا لقدرتها على توفير نطاق ترددي واسع جدًا مطلوب للاتصالات السريعة، وأنظمة الرادار، والاستشعار، وتطبيقات التصوير. ومن جهة أخرى، فإن تحقيق نطاق عريض ومستقر لمعاوقة الدخل مع الحفاظ على الحجم المصغّر، والكسب المقبول، وخصائص الإشعاع المستقرة، لا يزال يمثل تحديًا تصميميًا كبيرًا. وفي السنوات الأخيرة، تركزت جهود بحثية واسعة على تقنيات تحسين عرض النطاق الترددي للتغلب على هذه التحديات. يقدّم هذا البحث الاستعراضي مسحًا شاملًا لتقنيات تعزيز عرض النطاق المستخدمة في تصاميم هوائيات UWB المنشورة خلال الفترة من 2018 إلى 2025. وقد تم تصنيف التقنيات المستعرضة بشكل منهجي إلى تقنيات قائمة على تعديل الشكل الهندسي، وتعديل مستوى الأرضي، وتحسين أساليب التغذية، بالإضافة إلى دمج التراكيب الكهرومغناطيسية مثل الهياكل ذات الأرضي المعيب (DGS)، والأسطح الانتقائية للتردد (FSS)، والميتامواد، والأشكال الكسيرية. كما تم استعراض التقنيات الهجينة والتصاميم المعتمدة على الخوارزميات التحسينية نظرًا لأهميتها المتزايدة في تحقيق أداء عالٍ للنطاق العريض. ويُقدَّم تحليل مقارن لتطبيقات ممثِّلة يوضح الأداء، والمزايا، والمقايضات المرتبطة بكل تقنية. وأخيرًا، تم تحديد التحديات الأساسية واتجاهات البحث المستقبلية لدعم تطوير هوائيات UWB محسّنة لتطبيقات الاتصالات اللاسلكية للجيل القادم.
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