WordNet (r) 3.0 (2006):

frequency band
    n 1: a band of adjacent radio frequencies (e.g., assigned for
         transmitting radio or television signals) [syn: frequency
         band, waveband]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "frequency band":
   amateur band, amplitude, antinode, band, channel, citizens band,
   crest, de Broglie wave, diffraction, electromagnetic radiation,
   electromagnetic wave, fluctuation, frequency, frequency spectrum,
   guided wave, harmonic motion, in phase, interference, libration,
   light, longitudinal wave, mechanical wave, node, nutation,
   oscillation, out of phase, pendulation, period, periodic wave,
   periodicity, police band, radio channel, radio wave, ray,
   reinforcement, resonance, resonance frequency, seismic wave,
   shock wave, shortwave band, sound wave, standard band,
   surface wave, tidal wave, transverse wave, trough, vacillation,
   vibrancy, vibratility, vibration, wave, wave equation, wave motion,
   wave number, wavelength, wavering