Compact Dual-Band Antenna Using an Anisotropic Metamaterial

This paper presents a resonant type dual-band antenna with compact size which is realized by using an anisotropic metamaterial. The artificial anisotropic medium is implemented by employing a composite right/left-handed transmission line. The dispersion relation and the antenna physical size only depend on the composition of the unit cell and the number of cells used. By engineering the characteristics of the unit cells to be different in two orthogonal directions, the corresponding propagation constants can be controlled, thus enabling dual-band antenna resonances. In addition, the antenna dimensions can be markedly minimized by maximally reducing the unit cell size. The proposed antenna is designed at frequencies for PCS/Bluetooth applications. The physical size of the proposed dual-band antenna is 1/17λ
₀
x1/17λ
₀
x1/19λ
₀
where λ
₀
is the free space wavelength at 2.37GHz.