Miniaturized ultra-thin dual-band antenna with independent customizable operating frequencies based on SSPP structure

Abstract A miniaturized ultra-thin dual-band antenna based on spoof surface plasmon polaritons (SSPPs) is proposed in this work. The antenna consists of a top radiation patch etched with SSPP structure and bottom feeding plane which are connected by a series of shorting pins. The introduction of shorting pins and SSPP structure has achieved miniaturization of microstrip patch antennas. To achieve dual-band operation, a U-shaped slot is etched inside the radiation patch to divide the entire patch into an inner patch and an outer patch, and the resonant frequencies of the two patches are 2.6 GHz and 4.9 GHz, respectively. On this basis, by introducing SSPP structure into the inner patch, the two independent customizable operating frequencies can be realized. In addition, due to the use of two identical TM 1/2,0 resonant modes, it avoids the need for additional circuit structures to generate another resonant mode, which is beneficial for reducing thickness. With a miniaturized antenna size of 0.26 λ 0 × 0.43 λ 0 × 0.004 λ 0 ( λ 0 is the wavelength at 2.6 GHz), the proposed antenna has potential application prospects in highly integrated communication systems.