A novel ultra-high-frequency (UHF) radio frequency identification (RFID) tag antenna has been proposed in this article, which can be mounted on the surfaces of the human body and water. The proposed antenna is realized by an elliptical structure, whose long and short axes are 72 and 30 mm, respectively. The tag antenna consists of an elliptical loop radiation element, microstrip feed lines, arc matching networks, and tuning patches. We have analyzed the antenna radiation characteristics influenced by the structural parameters of the antenna and the thicknesses of the human body and water. The simulation and measurement results show that the proposed antenna can operate steadily on the surfaces of the human body and water with good conjugate impedance matching. The maximum measured reading range of the tag antenna on the surfaces of the human body and water can reach 5 and 7 m, respectively. The novelties exhibited in the proposed antenna include an elliptical structure, the stable performance on the surfaces of the human body and water, small size, and long reading range. K E Y W O R D S elliptical structure, human body surface, tag antenna, UHF RFID, water surface

A compact slotted Y‐shape patch antenna fed with a coplanar waveguide is described in this manuscript. The proposed antenna configuration comprises a modified rectangular slot printed on a single FR4 substrate which holds a Y‐shape patch antenna, and 2 equal length arms used to widen the impedance bandwidth. The antenna is manufactured and measurement results show good correspondence with the simulation analysis, with measured impedance bandwidth (defined for S11 ≤ −10 dB) of 44.9% (from 2.28 to 3.6 GHz) and stable gain larger than 2 dBi within the bandwidth of interest. The proposed antenna can be used for Wi‐Fi and WiMAX applications.

As a circuit element, memristor behaves like a nonlinear resistor with memory. It is demonstrated as the fourth fundamental circuit element in addition to resistor, capacitor and inductor. This paper summarized the main progress in this field, such as, the development of models and mechanism, the selection of new materials, the experimental results, and the similarities and differences of unipolar and bipolar Resistive Switching Characteristics

A radio frequency chamber for rapid food thawing is presented. The proposed chamber is mainly composed of an aluminum shell, a plastic tray, and two metal cylinders with two metal disks located in the top and bottom of the chamber. The size of the thawing chamber is 300 × 300 × 230 mm. The proposed chamber resonates at a frequency of 433 MHz. The influences of the size of the frozen models and the chamber structure on the resonant frequency are analyzed. The simulated electric field of the chamber is distributed evenly and concentrated. Experimental results demonstrate that the proposed chamber can provide a fast and uniform thawing effect compared with the other three current methods.

Resistive random access memory (RRAM) has attracted comprehensive attention from academia and industry as a new-type of nonvolatile memory. This memory has many advantages, such as high-speed, low power consumption, simple structure, high-density integration, etc. Therefore, it has a strong potential to replace DRAM. This paper summarizes the recent progress of the studies on RRAM. Although the achievement obtained has been summarized, there is still a long way from the real application. We also discuss the principle and related properties of RRAM and forecast the preparation trends of RRAM