Connector and signal transmission method using the same

A connector to be mounted to a mounting object and connected to a connecting object, the connector comprising:

• a plurality of high-speed differential signal lanes each of which is composed of two first contacts arranged adjacent to each other and two ground contacts sandwiching the two first contacts and arranged on opposite sides of the two first contacts, one on each side;
• and
• at least one second contact which is disposed between adjacent ones of the high-speed differential signal lanes;
• each of the first contacts, the ground contacts, and the second contact having a contacting portion to be connected to the connecting object and a terminal portion to be connected to a mounting object;
• each of the first contacts being a contact for transmitting a high-speed electric signal containing a frequency component corresponding to a wavelength λ satisfying L>(λ/20) where L represents a length of the first contact from the contacting portion to the terminal portion;
• the second contact being a contact used when a signal to be transmitted does not contain a frequency component corresponding to a wavelength λ satisfying M>(λ/20) where M represents a length of the second contact from the contacting portion to the terminal portion;
• the connector having a first connection side for connection with the connecting object, where the contacting portions of the first contacts, the contacting portions of the ground contacts, and the contacting portion of the second contact are arranged in a single row at a distance from one another;
• the connector having a second connection side for connection with the mounting object, where the terminal portions of the first contacts and the terminal portions of the ground contacts are arranged in a first row at a distance wider than that between the contacting portions while the terminal portion of the second contact is arranged in a second row different from the first row.