Magnetic feedthrough cancelling surface acoustic wave device

A surface acoustic wave (SAW) device comprising an input transducer and an output transducer, the input transducer connected to a first reference potential point and to an input signal potential point, the output transducer connected to a second reference potential point and to an output signal potential point, one of the transducers having a plurality of loops, said input transducer functioning on application of an oscillatory signal at its signal potential point to generate a SAW and a magnetic flux, the SAW and the magnetic flux functioning to generate SAW induced voltage and magnetic flux induced voltage at the output transducer, both induced voltages having components corresponding to respective loops, the loops of said one transducer being so connected to one another and to the reference and signal potential points of said one transducer that at the output transducer signal potential point, the components of the magnetic flux induced voltage substantially cancel and the components of the SAW induced voltage add.