Patent ID: 8791705

Claim:
A calibration substrate having at least one calibration standard comprising at least two electrical connection points, each for one measurement port of a vector network analyzer, at least one of said at least two electrical connection points of said at least one calibration standard including a switch, wherein the switch comprises: one first electrical contact which is electrically connected to an electrical connection point of the calibration standard; a second electrical contact which is configured for electrically connecting to a measurement port of the vector network analyzer; and a third electrical contact, wherein the switch is configured such that with the second electrical contact free and electrically connected to nothing, the switch makes an electrical connection between the first and third electrical contacts; wherein an electrical connection between the second and first electrical contacts and between the second and third electrical contacts is broken, and that with the second electrical contact electrically connected to said measurement port of the vector network analyzer, the switch breaks the electrical connection between the third and first electrical contacts and makes an electrical connection between the first and second electrical contacts, wherein an electrical connection between the third electrical contact and the second electrical contact is broken.