Definition of "quarter-wave" []

• In physical, one fourth of a wave-length; the distance measured along the path of a wave-train which corresponds to a fourth of a period, or to a difference of phase of . (noun)

The Century Dictionary (Public Domain)

• "A quarter-wave coaxial cavity as a power processing plant"
• "Wireless transmission of electrical energyExtracting electromagnetic energy from the nonlinear Earth as a self-pumped phase conjugate mirrorThe distribution of electrical power by means of terrestrial cavity resonator modesWireless transmission of power - resonating planet EarthA quarter-wave coaxial cavity as a power processing plant"
• "These include low-residual-pulse quarter-wave stub with bandwidths in excess of an octave, as well as wide band gas tube protectors with options suitable for high-powered RF applications."