SAW 4.3 GHz Delay Line and Reflector Design Results

Abstract

Surface acoustic wave (SAW) sensors provide wireless and passive operation within small embodiments. With the recent adoption of the 4.2 to 4.4 GHz band for Wireless Avionics Intra-Communication (WAIC), SAW sensors are a promising solution for current and future demands of this application. Although some experiments on SAW sensors have been done at GHz frequencies, very little is known about SAW propagation, important parameters, and properties at these frequencies. No SAW sensors have been demonstrated at WAIC frequencies up to date.This paper presents the design and analysis of SAW delay lines, and reflector devices at 4.3 GHz. Unmatched SAW delay line response having 33 dB loss has been achieved; even though this may seem high – it is acceptable for SAW sensors within near-field ranges expected in air- and space- craft frames. SAW device simulation using the coupling of modes (COM) model [1], device fabrication feasibility, preliminary measurements, and a demonstration of wireless sensor operation at 4.3 GHz will be given. Transducer design topologies explored are shown with validation of transduction coupling at harmonics. Device embodiment and antenna design will also be presented.