Frequency limitation in the calibration of microwave2000 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 51, NO. 9, SEPTEMBER 2003 Frequency Limitation in the Calibration of Microwave Test Fixtures Ning Hua Zhu, Member, IEEE, Chen Qian, You Lin Wang, Edwin Y. B. Pun, Senior Member, IEEE, and Po-Shuen Chung, Senior Member, IEEE Abstract―The problem of frequency limitation arising from the calibration of asymmetric and symmetric test fixtures has been investigated. For asymmetric test fixtures, a new algorithm based on the thru……