A　60-GHz　half-mode　SIW　bandpass　filter　using　GaAs　technology　is　proposed　in　this　paper.　By　etching　four　slots　on　the　top　layer,　the　half-mode　SIW　cavity　is　divided　into　three　resonators.　Two　slots　centered　in　the　metal　layer　provide　the　electric　coupling　between　the　adjacent　resonators.　And　the　other　two　slots　away　from　center　are　used　to　adjust　the　impedance　matching　between　the　feed　lines　and　the　half-mode　SIW　cavity.　Based　on　the　concept　of　coupled　resonators　and　synthesis　method,　the　dimensions　of　filter　are　determined　and　well　tuned　to　get　a　predicted　transmission　zero　in　the　stopband,　which　sharpens　the　roll-off　skirt　and　improves　the　stopband　performance.　©　2021　IEEE.