near millimeter wave; submillimeter wave
Technical term used in radio engineering and telecommunications for electromagnetic waves with frequencies just below the millimeter-wave band (typically around 30–300 GHz).
The near millimeter wave band is attracting attention in next-generation communications.
This antenna supports submillimeter waves.
Compound of 準 (jun, 'quasi-', 'near-') and ミリ波 (miri-ha, 'millimeter wave'), a direct calque of English 'near millimeter wave' or 'submillimeter wave'.