The Study of Bandwidth Expansion of Metamaterial Antenna Designed by Using Spiral Resonator

In the few years, the development of communication technology is rapidly. The metamaterial is interesting for radio frequency fielded researchers. Normally the metamaterial antenna behavior is narrowband. Therefore, the spiral resonator metamaterial antenna used for bandwidth expansion is presented in this work. The proposed antenna is designed by using a monopolar patch antenna with 2×4 different sizes of the spiral resonator (SR). Because the combination of four nearly interval resonant frequencies from 2×4 different sizes of SR make the resonant frequency around 1.7–2.63 GHz, the bandwidth is wider from 400 MHz to 930 MHz.