Minimising interferences caused by switching low current
It is doubtful that it would directly interfere at 2.4 GHz but there are subsystems such as local oscillators, IF chains, etc. that could be affected.

Follow the spec sheet for the switcher with regard to PCB layout, bypassing, and Q of components. The use of EMI shielding techniques for the switcher and a solid LC low pass filter on the output will go a long way in mitigating potential interference. Don't overlook proper bypassing on the input connections of the switcher either.