Patent ID: 7769555
Filing Date: 2010-08-03
Classification: G01R

Abstract:
1. Method for calibration of a vectorial network analyzer, having n measurement ports for n>1 and m measurement sites, in which, n+1<m<2n, by consecutive measurement of reflection and transmission parameters at k=sum (n−i) for (i=1, 2, . . . , n−1) different, two-port calibration standards connected between the measurement ports in any sequence, all of which must have a transmission path, and three different additional n-port calibration standards connected between the measurement ports in any sequence, which may have no transmission, by mathematical determination of error coefficients of the network analyzer by means of ten-term methods in a k-fold application, using the measured two-port calibration standards and by mathematical determination of error-corrected scattering matrices [S x ] of the n-port calibration standards from the error coefficients of each two-port calibration standard, with consideration of transmission error quantities of other n−2 measurement ports by means of ten-term multiport methods, in which (a) said k calibration measurements are conducted on a two-port, which is implemented by means of direct connection of the measurement ports (through connection, T=thru) or a short adapted line (L=line) of known length and attenuation, and which is connected between each k possible measurement port combination, (b) one of said additional calibration measurements is carried out on an n-fold one-port (n-one-port), which is implemented by means of n known impedances, in which the n known impedances can be different in comparison with each other, (c) one of said additional calibration measurements is conducted on an n-one-port, which is implemented by means of n unknown, strongly reflecting terminations (R=reflect), whose electrical properties are similar to those of shorts (S=short), (d) one of said additional calibration measurements is conducted on an n-one-port, which is implemented by means of n unknown, strongly reflecting terminations (R=reflect) whose electrical properties are similar to those of opens (O=open), and (e) the reflection values of the n-one-ports, which are implemented by unknown reflecting terminations, similar to shorts or opens, are determined mathematically.