This article experimentally studies the application of vanadium dioxide (VO 2 ) thin film for tunable inductor design. VO 2 's temperature-dependent conductivity is used for implementing a tunable inductor using VO 2 as the control material. Two different configurations of inductors are designed. One design uses a short VO 2 bar as a circuit switch and the other uses VO 2 to replace the full spiral coil inductor. The frequency range in the experiments is 0.3-2 GHz. Experimental results show a 32% tuning range (1-0.68 nH) through applied temperature variation (25-1008C) in the devices. These results are matched by a working circuit p model.
ABSTRACT:In this work, a dual bands omnidirectional monopole antenna is proposed. A planer Y-shaped patch is loaded on the top of the surface and a slot is loaded on the ground plane to obtained broadband. Rogers RT/duroid5880(tm) substrate is used with dielectric constant 2.2 and loss tangent 0.0009. The results of the proposed antenna for the variation of width and length of the ground plane are investigated. Two licensed free frequency bands at 2.4 GHz and 5.8 GHz are obtained for WiFi and Bluetooth application. The measured frequency bands of 2.3-2.52 GHz at 2.4 GHz and 4.22-10.30 GHz with two resonant frequencies at 4.96 and 8.36 GHz are obtained. The peak antenna gain of 4.6 dBi at 2.4 GHz is achieved. Simulation has been done using MOM base Ansoft designer software.
It is still a challenge to employ the acoustic method to investigate the molecular relaxation phenomena in excitable gases. Here we present an algorithm to capture the primary relaxation processes by only measuring the sound absorption and sound speed of two operating frequencies at a single pressure, without the necessity of detecting the gas density. This algorithm is developed from the fact that the frequency-dependent sound absorption curve due to a single-relaxation process can be reconstructed from the two values of the relaxation frequency and the maximum relaxational absorption, and they can be synthesized by the acoustic measurements at two frequencies. Moreover, by acquiring the high-frequency sound speed, those two synthesized values can be used to reconstruct the sound dispersion curve. The simulations demonstrate the validity of the proposed algorithm and its robustness against errors of acoustic measurements.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.