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This paper presents W-waveform Standing Surface Acoustic Waves (W-SSAW), andas its application, patterning of two groups of microparticles with differentsizes alternately without fixing firstly patterned particles. W-SSAW isconstructed by two standing surface acoustic waves of frequencies $f$ and $2f$.Combined with linear phase modulation to translate Gor'kov potential at aconstant speed, W-SSAW can selectively trap particles. The trapped particlesfollow the moving Gor'kov potential maintaining force equilibrium betweenStokes' drag and the radiation force by W-SSAW. There exist two asymmetricequilibrium positions every period, and by the asymmetry, each group ofparticles is trapped at different equilibrium positions to form an alternatepattern. This technique is extended to two-dimensional alternate patterning bymaintaining phase difference $90^\circ$ between X- and Y-directional W-SSAWs.The patterning method utilizing W-SSAW is advantageous over SSAW-basedpatterning in that it does not require temporal separation to fix firstlypatterned particles.

W-waveform Standing Surface Acoustic Waves with Two Equilibrium  Positions under Linear Phase Modulation for Patterning Microparticles into  Alternate Grid Patterns