The design and construction of a comparison impedance bridge for frequencies of 40¿270 Mc/s

This paper describes two types of impedance bridge, one for measuring ¿unbalanced¿ and the other for measuring ¿balanced¿ impedances to earth. The frequency range is approximately ± 20% of the working midfrequency, and the bridges here described operate at a mid-frequency of 50¿250 Mc/s.