A Planar Millimeter-wave Bow-tie Metamaterial Structure for 5G Applications

In this paper, a new planar tunable bow-tie metamaterial unit cell (BTMUC) is designed for millimeter-wave frequency bands. The frequency range of the proposed BTMUC is 28–32 GHz suitable for 5G applications. In this structure, two triangle-shaped (TS) parts are used to form the bow-tie configuration. The resonance frequency of the proposed BTMUC can be tuned in the frequency range of 27 GHz to 42 GHz by changing the distance between the two TS parts. The final dimensions of the proposed BTMUC are $4 \times 4 \times 0.254 mm^{3}$corresponding to $0.011 \lambda_{g}^{3}$, where $\lambda_{g}$is the guided wavelength at 30 GHz. The proposed BTMUC has some critical advantages, such as design simplicity frequency tunability, and a large stopband (bandgap).