From a process design perspective, the presence of distributed capacitance places stringent requirements on the high-frequency transformer winding process.
At high frequencies, core losses and winding copper losses can cause a significant temperature rise in the inductor. The permeability of the core material decreases with increasing temperature, which in turn reduces inductance and suppression capability.
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Eddy current losses in iron losses are proportional to the square of the frequency, while the degree to which copper losses are affected by frequency depends on the winding structure and the severity of the skin effect.
Increasing the winding spacing or using insulating medium isolation can reduce the inter-turn capacitance.