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

Download
2015
Batur, Mehmet Nazım
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.

Suggestions

Design and realization a quasi yagi antenna array and its feed system printed on a ceramic substrate for x-band radar applications
Atabay, Berkay; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2019)
This thesis includes design, simulation, realization and measurement of a four-element quasi- Yagi antenna array printed on a ceramic substrate for X-band radar applications. The microstrip array antenna is designed using four quasi-Yagi antennas in a linear configuration and is printed on Alumina 99.6% substrate made by Coorstek Corporation. The antenna can fit into small areas because of compact structure due to the use of high dielectric constant substrates. In addition, the use of alumina ceramic substr...
Design of asymmetric coplanar strip folded dipole antennas /
Karaciğer, Kamil; Alatan, Lale; Department of Electrical and Electronics Engineering (2014)
This thesis includes the design, simulation, production and measurement of an asymmetric coplanar strip folded dipole antenna suitable to be used as an element in a linear array operating at S-band (2.7 GHz - 3.3 GHz). In this same manner, its usefulness as an array antenna is also explored in this thesis. This antenna element consists of a microstrip line feed, microstrip to coplanar stripline transition (BALUN) and asymmetric coplanar strip (ACPS) folded dipole. The planar folded dipole can be constructed...
Full wave electromagnetic optimizations using surface integral equations and the multilevel fast multipole algorithm
KARAOSMANOGLU, BARISCAN; ONOL, CAN; GULER, SADRI; ALTINOKLU, ASKIN; Ergül, Özgür Salih (2016-08-11)
We present an electromagnetic optimization environment based on full-wave solutions via surface integral equations and the multilevel fast multipole algorithm (MLFMA). Optimizations are performed by using genetic algorithms, while the required trials are performed accurately via MLFMA. The developed mechanism can handle many different operations, such as portion moving/removing, rotation, and gap opening, that have different effects in the constructed matrix equations but that can efficiently be executed in...
Novel multi-band metamaterials in microwave region with applications in antennas
Küçüksarı, Öznur; Sayan, Gönül; Department of Electrical and Electronics Engineering (2014)
This dissertation is focused on the design, fabrication, and characterization of multi-band metamaterials in microwave region with novel applications in antennas with the following outcomes: In the first part of dissertation, important concepts that have to be considered during the design, simulation and characterization of planar metamaterial arrays are investigated. All investigations are performed using the planar dual band nested U-ring resonator (2-NURR) metamaterial array that is a novel exemplar of t...
Method of lines for transient flow fields
Tarhan, T; Selçuk, Nevin (2001-01-01)
A computational fluid dynamics (CFD) code based on the method of lines (MOL) approach was developed for the solution of transient, two-dimensional Navier-Stokes equations for incompressible separated internal flows in complex rectangular geometries. The predictive accuracy of the code was tested by applying it to the prediction of flow fields in both laminar and turbulent channel flows with and without sudden expansion, and comparing its predictions with either measured data or numerical results available i...
Citation Formats
M. N. Batur, “MOM analysis of loaded printed dipoles with applications in the design of electrically small antennas,” M.S. - Master of Science, Middle East Technical University, 2015.