SHANNON'S sampling theory suggests that frequency aliasing results whe
n a signal is reconstructed from the sampled data stream with a sampli
ng rate of less than 2f(s) (where f(s) is the maximum frequency of the
signal). The effects of aliasing are particularly deleterious for sur
face-acoustic-wave (SAW) filters with non-symmetric transfer functions
, This is demonstrated by experiments on non-symmetric SAW filters fab
ricated on 128 degrees YX lithium-niobate substrates.