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Design of defected ground structure (DGS) for mutual coupling reduction of microstrip antenna array

Mohamed, Mohamed Hashi (2014) Design of defected ground structure (DGS) for mutual coupling reduction of microstrip antenna array. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Mutual coupling is a well-known effect in multi element array antennas. Generally, mutual coupling is an unwanted phenomenon that distorts the behavior of the radiating elements in an antenna array. Every element in an antenna array affects every other element by radiating over the air or by propagating surface currents through the ground plane. Surface currents can be a bigger problem, especially when antenna elements are closely packed. Microstrip patch antennas are well-known antenna types in different kinds of applications, like mobile and satellite communications. In practice, an array of several antenna elements is used for applications requiring high gain and/or high directivity. However, the performance of such antennas tends to drop due to the strong mutual interaction between the antenna elements. In this project, a two compact T-shaped defected ground structure (DGS) placed back to back are applied to reduce the mutual coupling between elements in a microstrip antenna array design. The proposed compact DGS slots are inserted between the adjacent E-plane coupled elements in the array to limit the propagation of surface waves between the elements of the array. In order to validate the feasibility of the proposed structure, a two-element array with 0.45λo distance between centers of two patches is designed, fabricated, and measured. The measured results show a reduction in mutual coupling of 19 dB obtained between elements at the operation frequency. Radiation patterns have minimal change in the broadside direction but back lobe level is increased because of the existence of the slots in the ground plane.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2000-2891 Dynamoelectric machinery and auxiliaries
Depositing User: Normajihan Abd. Rahman
Date Deposited: 27 May 2014 02:43
Last Modified: 27 May 2014 02:43
URI: http://eprints.uthm.edu.my/id/eprint/5501
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