Mom analysis of loaded printed dipoles with applications in the design of electrically small antennas

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2015

Öğrenci: MEHMET NAZIM BATUR

Danışman: LALE ALATAN

Özet:

Mixed Potential Integral Equation based Method of Moments (MoM) code is developed in MATLAB environment to analyze a loaded printed dipole antenna. Closed-form spatial domain Green's functions are used in the formulation. The developed code is utilized in the analyses of Electrically Small Antennas (ESAs). It is known that real part of the input impedance of an ESA is very low, whereas imaginary part is negative and high. The inductive loading method is used in order to overcome this problem. Effects of load values and positions on the input impedance and on the efficieny of the antenna are investigated. The results obtained by the developed MoM code are compared to ones obtained by EMPro which is Agilent’s 3D electromagnetic solver and good agreement is observed. Then, three ESA’s with different lengths are manufactured and they are loaded with the proper load values at proper positions. The input return loss values of these antennas are measured and compared with simulations. It is seen that measurement results are in good agreement with the results obtained by the developed code.