Microwave Acoustic Surface-Wave Components

Various acoustic surface-wave components operating at frequencies higher than 1 GHz have been realized using an electron beam pattern generator. Thus delay lines, filters and oscillators have been realized on lithium niobate and quartz substrates. Simple and tapped delay lines using transducers with constant or variable finger-spacing have been tested and the bandwidth and maximum delay were found to be respectively about 600 MHz and 10 ¿sec. A line coded according to a 13 chip Barker code was realized as well as dispersive delay lines using split fingers. A filter with a narrow bandwidth (8 × 10-4 in relative value) was looped with an amplifier in order to obtain an oscillator operating at 1.4 GHz.