High-performance temperature sensing is a key technique in modern Internet of Things. However, it is hard to attain a high precision while achieving a compact size for wireless sensing. Recently, metamaterials have been proposed to design a microwave, wireless temperature sensor, but precision is still an unsolved problem. By combining the high-quality factor (Q-factor) feature of a EIT-like metamaterial unit and the large temperature-sensing sensitivity performance of liquid metals, this paper designs and experimentally investigates an Hg-EIT-like metamaterial unit block for high figure-of-merit (FOM) temperature-sensing applications. A measured FOM of about 0.68 is realized, which is larger than most of the reported metamaterial-inspired temperature sensors.
This article presents a new defected ground structure (DGS) and expands its application for designing high-performance bandpass filters based on substrate integrated waveguide (SIW) platform. The presented DGS is consisted of two complementary stepped-impedance E-shaped structures and placed them together face-to-face. Such designed DGS is inserted into the top layer of a millimeter-wave SIW to act as high-frequency stopping property. Based on the proposed DGS, two high-performance SIW bandpass filters with single-band and dual-band features are achieved, by fabricating prototypes and experimentally investigating the filtering performances. Good agreements between the simulations and experiments are obtained. Such proposed SIW bandpass filters based on the designed new DGS can be widely used in the upcoming 5G communication area.
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