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For example, the wavelength at 2.4 GHz is approximately 12 cm, which means the half and quarter wavelengths are 6 cm and 3 cm, respectively.  Therefore, a minimum wavelength of 3 cm is required to radiate properly in a 2.4 GHz system.  Most of Johanson Technology’s 2.4GHz antenna models can achieve under 1 cm in wavelength.  The unique internal dielectric material causes the effective wavelength to be shortened, which reduces the length of the internal metal spiral and hence the size of the chip antenna accordingly.  Other popular offerings besides 2.4 GHz applications include: ultra-wide band and WiMAX tri-band antenna models.