Title :
Attenuation-Measurement System in the Frequency Range of 18–40 GHz
Author :
Widarta, Anton ; Iida, Hitoshi ; Kawakami, Tomoteru
Author_Institution :
National Metrol. Inst. of Japan, National Inst. of Adv. Ind. Sci. & Technol., Tsukuba
fDate :
4/1/2007 12:00:00 AM
Abstract :
The attenuation-measurement system of the National Metrology Institute of Japan - the dual-channel intermediate-frequency (IF)-substitution method using an inductive-voltage divider (IVD) as a reference standard - is improved to cover the frequency measurement range of 18-40 GHz. Higher accuracy is obtained by raising the IF to 10 kHz and employing two seven-decade IVDs in cascade arrangement. The use of the frequency doublers at each local port of the mixers allows the low-pass filters to be installed to satisfy the essential isolation between the channels. A 10-kHz voltage-ratio standard has been constructed and used as a reliable technique for uncertainty evaluation and long-term accuracy control of the 10-kHz null-balance receiver. The expanded uncertainties are expected to be 0.002 dB for attenuation up to 40 dB, 0.005 dB for 60 dB, and 0.03 dB for 80 dB
Keywords :
attenuation measurement; frequency multipliers; low-pass filters; measurement standards; microwave measurement; voltage dividers; voltage measurement; 10 kHz; 18 to 40 GHz; attenuation measurement; cascade arrangement; frequency doublers; inductive-voltage divider; intermediate frequency substitution; low-pass filters; microwave measurements; voltage-ratio standard; Attenuation; Frequency conversion; Frequency measurement; Low pass filters; Metrology; Microwave measurements; RF signals; Radio frequency; Testing; Voltage control; Attenuation; dual channel; inductive-voltage divider (IVD); intermediate-frequency (IF) substitution; microwave measurements; standards;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891133