Dual-Band Acoustics Promoted Low Frequency Antenna

A dual-band bulk acoustic wave (BAW)-mediated multiferroic antenna is proposed, modeled and simulated, which is mainly composed of two multiferroic materials, namely, ZnO and FeGaB. As the devised antenna is implemented with acoustic resonance, the size of low frequency antenna can be reduced compared with conventional low frequency antenna. In this case, the entire length of antenna is 2000 μm and its thickness is about 20 μm. A two-dimensional antenna model is created using commercial software COMSOL MULTIPHYSICS based on finite element. As a result, the antenna has two frequency bands operating at 251MHz and 528MHz. The imulation results show that the antenna provides good resonance at the desired working bands, and the stress generated by the resonance is smoothly transferred from the piezoelectric layer to the magnetostrictive layer, realizing the conversion of electric-magnetic converting.

I. Introduction

With the blooming and boosting of wireless communication (WC) technologies, many new techniques, methods and devices are going to be tiny and highly integrated [1]-[2]. Additionally, antenna is also moving to low frequency like 700MHz, which is also an important component for signal trans-receiving in a WC system. For MHz-band, antenna size is large, making it difficult for MIMO application in a small smart iPhone. Antenna miniaturization for MHz band designs is an interesting and meaningful work [3]-[5]. Especially, for rapid developing marine WC systems, low-frequency (LF) is very commonly used because of its strong penetrability for water, sea and underground environments. As we know, the conventional LF antenna based on 1/4 λ theory is large, making it impossible for mobile devices [6].