IJE TRANSACTIONS A: Basics Vol. 27, No. 10 (October 2014) 1565-1572   

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Ch. Ghobadi and M. Majidzadeh
( Received: February 11, 2014 – Accepted: May 22, 2014 )

Abstract    A compact microstrip-fed antenna with dual notched bands is proposed. First, a simple basic configuration is presented for Ultra Wide Band (UWB) applications and then the dual band notched structure is extended from the UWB one. The basic structure of the UWB antenna consists of a simple square radiating patch and a ground plane with a wide square slot on back of the substrate. A semi-circle shaped slot is cut from the ground plane to improve the antenna impedance matching. In the sequel, aimed at filtering Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local Area Network (WLAN), via-fed inverted T-shaped element and two rectangular stubs are embedded in the antenna structure. The presented antenna is printed on a 20 × 20 × 0.8 mm3 FR4 substrate and operates over the frequency range of 2.9-16 GHz with WiMAX WLAN notched. To compare the performance of the proposed UWB antenna with respect to some previous designes, a novel framework based on the Analytical Hierarchy Process (AHP) is proposed. Using AHP methodology, the important operational aspects of antennas are taken into account simultaneously, resulting in a comprehensive comparison. Expert Choice software is used to apply the AHP technique.


Keywords    Analytical hierarchy Process, Dual band-notch, Expert choice software, UWB antenna, Via-fed elements


چکیده    چكيده در اين مقاله ساختار جديدی از يک آنتن ميکرواستريپ کوچک دارای دو ناچ فرکانسی ارائه شده است. در ابتدا يک آنتن پايه برای حوزه فرکانسی فرا پهن باند ارائه شده و سپس ساختار آنتن دارای ناچ فرکانسی از ساختار پايه به وجود آمده است. ساختار پايه آنتن فرا پهن باند از يک پچ تشعشتعي مربعي ساده و يک صفحه زمين دارای اسلات در پشت زيرلايه تشکيل شده است. يک شکاف نيم دايره­ای درست در پشت لبه پايينی پچ تشعشعي از صفحه زمين بريده شده است که باعث بهبود تطبيق امپدانسی مي­شود. سپس با هدف فيلتر کردن باندهای فرکانسی WiMAX و WLAN از باند فرکانسی فرا پهن باند، يک المان T وارونه و دو بازوی مستطيلی تغذيه شونده با via در ساختار آنتن جاسازی شده­اند. آنتن ارئه شده برروی زيرلايه FR4 به اندازه 8/0×20×20 ميليمتر مکعب چاپ شده است و پهنای باند 16-9/2 گيگاهرتز را به جز باندهای فرکانسی فيلتر شده WiMAX و WLAN را پوشش مي­دهد. برای مقايسه عملکرد آنتن ارائه شده در اين مقاله با برخی از ساختارهای ارائه شده قبلی يک چارچوب جديد بر پايه فرآيند تحليل سلسله مراتبی (AHP) ارائه شده است. با استفاده از روش AHP مي­توان آنتن­های مورد نظر را به طور همزمان نسبت به جنبه­های عملکردی مختلف مقايسه کرد و به اين ترتيب مقايسه­ای کامل و جامع انجام داد. برای اعمال متد AHP از نرم­افزار Expert Choice استفاده شده است.



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