Abstract: A connecting apparatus for connecting a first electronic device and a second electronic device together comprises a first port, a second port electronically connected to the first port, and a printed circuit board (PCB). The PCB comprises a first grounded region, a second grounded region, and a first electronic element. The first electronic element is electronically connected between the first grounded region and the second grounded region. When the first electronic device is electronically connected to the second electronic device together via the connecting apparatus, the first port is electronically connected to the first electronic device, and the second port is electronically connected to the second electronic device. The first grounded region, the first electronic element, and the second grounded region form a first return current path for allowing high frequency signals to pass through. A printed circuit board thereof is also provided.