Design of a miniaturization printed circular-slot UWB antenna by the half-cutting method

In this letter, the miniaturization design of a novel printed circular slot UWB antenna is presented and investigated. By the half-cutting method and adjusting VSWR, the size of the proposed antenna is reduced from 40 × 40 to 10 × 20 mm₂. Experimental results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1-10.6 GHz with VSWR < 2. Monopole-like radiation pattern is observed in both H-plane and E-plane. The study of transfer function (magnitude and phase of S₂₁) and signal waveform indicate a good time-domain characteristic of the antenna. The proposed antenna has a compact size, good radiation characteristics, ultrawide bandwidth, and good time-domain behaviors to satisfy the requirement of the current wireless communication systems.