Patent ID: 8227707

Claim:
A circuit board comprising: a multilayer substrate having a top surface, a top surface earth pattern on the top surface, a signal line on the top surface, an inside earth pattern in the multilayer substrate, a lateral surface at an outer periphery of the multilayer substrate, a connector arrangement space at the outer periphery, and a cut out via hole at the outer periphery, the lateral surface including a first portion defined by the cut out via hole and a second portion defined by the connector arrangement space, the inside earth pattern reaching the first portion and not reaching the second portion; a connecting conductor pattern arranged at an end of the inside earth pattern and at the first portion of the lateral surface, the connecting conductor pattern electrically connecting the top surface earth pattern with the inside earth pattern; and a connector arranged at the connector arrangement space and having an inside conductor and an outside conductor, the inside conductor electrically connected with the signal line, the outside conductor electrically connected with the connecting conductor pattern.