Conference Paper

Design of a Subwavelength Patch Antenna Using Metamaterials

Electron. Eng. Dept., Gyeongsang Nat. Univ., Jinju
DOI: 10.1109/EUMC.2008.4751687 Conference: Microwave Conference, 2008. EuMC 2008. 38th European
Source: IEEE Xplore


We present our design of a subwavelength patch antenna using metamaterials for its small size. Metamaterials are constructed of periodic resonant embedded circuits made up of 8 times 2 loop arrays with an inductance L terminated to a series capacitor C in the substrate to create an artificial magnetic molecule. The subwavelength elements in these structures make them behave as an effective medium with negative values of permittivity and permeability at the frequencies of interest. Their performance and physical parameters can be characterized using the analytical transmission line model. To simplify construction, our antenna was composed of six substrate layers for the periodic resonant embedded loop circuits, with inductance L terminated to a series capacitor C in the substrate. The radiation characteristics of a subwavelength patch antenna using metamaterials are calculated using CST Microwave Studio. The experimental results show that the wavelength of our subwavelength patch antenna using metamaterials with rectangular LC loop arrays is 1/18 that of the conventional patch antenna without LC loop arrays. The measured results are in good agreement with the calculated results.

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    ABSTRACT: In this paper a miniature rectangular patch antenna is specifically designed and analyzed using metamaterial concepts. Based on an ordinary patch antenna, it has a double C shaped resonant structure embedded in the center of the substrate of the rectangular patch antenna. The resonant structure has a strong electric response in a certain frequency of interest, and can be used to construct metamaterials with negative permittivity. It is found the great impact on the antenna performance to modify the dimension to 58% of a conventional patch antenna. This antenna has strong radiation in the 45° to the horizontal direction for some specific applications within the sub-resonant band, and can construct a dual frequencies antenna under certain conditions. Numerical results verify that the novel antenna performance is satisfactorily.
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