Planar transformers are a specialized type of transformer designed for high-frequency applications and characterized by their low-profile and compact design. These transformers use planar construction techniques, where the windings are made from flat copper traces or layers on a printed circuit board (PCB) or other flat substrates, rather than traditional wire windings. This construction method allows for a more compact design, improved thermal performance, and greater consistency in manufacturing. The key advantages of planar transformers include their ability to handle high power densities while maintaining a low profile, making them ideal for applications with space constraints, such as in telecommunications, automotive electronics, and aerospace. Planar transformers offer excellent thermal management due to their large surface area, allowing heat to dissipate efficiently. Additionally, the planar construction enables precise winding configurations, resulting in improved electrical characteristics such as lower leakage inductance and reduced parasitic capacitance. These features contribute to higher efficiency and lower electromagnetic interference (EMI), which are crucial in high-frequency power applications. Planar transformers are a preferred choice for applications requiring a combination of compact design, high power density, and efficient thermal management.