ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without ... more ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without source and load being matched to the line impedance. Insertion loss measurements to the DUT and to the DUT fitted by quarter-wavelength lines are carried out, then the attenuation is obtained simply, unrelated to the source and load reflection coefficients. Experiment results on two 20-dB attenuators at 11 GHz show good agreements with those being impedance matched.
Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method ... more Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method for radio frequency(RF) attenuation measurement. Basically, the conversion equation V=kappaEs alpha (alpha=1, kappa=constant) is valid in a proper range of Es where Es and V are RF input and IF output amplitudes, respectively. This paper discusses the possibility that alphane1
2008 Conference on Precision Electromagnetic Measurements Digest, 2008
ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without ... more ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without source and load being matched to the line impedance. Insertion loss measurements to the DUT and to the DUT fitted by quarter-wavelength lines are carried out, then the attenuation is obtained simply, unrelated to the source and load reflection coefficients. Experiment results on two 20-dB attenuators at 11 GHz show good agreements with those being impedance matched.
2004 Conference on Precision Electromagnetic Measurements, 2004
Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method ... more Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method for radio frequency(RF) attenuation measurement. Basically, the conversion equation V=kappaEs alpha (alpha=1, kappa=constant) is valid in a proper range of Es where Es and V are RF input and IF output amplitudes, respectively. This paper discusses the possibility that alphane1
2019 IEEE Conference on Antenna Measurements & Applications (CAMA)
Attenuation standards in the frequency range of 9 kHz to 50 GHz have been established at the Nati... more Attenuation standards in the frequency range of 9 kHz to 50 GHz have been established at the National Metrology Institute of Japan (NMIJ/AIST) for ensuring traceability of antenna and EMC measurements in Japan. The standards were realized by two originally developed precision attenuation measurement systems based on the intermediate frequency (IF) substitution method. The first system works in the frequency range of 9 kHz to 1 GHz, built in the highest accuracy dual channel null detection configuration using an inductive voltage divider (IVD) at 1 kHz as IF reference standard. The second system functions to extend the frequency range of 1 GHz to 50 GHz, built in a simple single channel configuration using a step attenuator at 30 MHz as IF reference standard. Traceability of the IVD is obtained directly to the Japan national standard of low-frequency voltage ratio, however, the traceability of the step attenuator standard is obtained through calibration using the first system. Attenuation calibration and measurement capabilities range from 0 to 110 dB with a frequency range of 9 kHz to 50 GHz and an expanded uncertainty range of 0.002 dB to 0.068 dB.
2020 Conference on Precision Electromagnetic Measurements (CPEM)
Primary standard of attenuation in the frequency range of 1 kHz to 10 MHz is developed to meet th... more Primary standard of attenuation in the frequency range of 1 kHz to 10 MHz is developed to meet the demands in recent EMC regulations that require traceability of measurements to national standards. A null detection system with an IVD as a reference standard is constructed to allow attenuation at 1 kHz, 9 kHz, and 10 kHz to be measured accurately by comparing to the voltage ratio of the IVD. Attenuation in the frequency range of 100 kHz to 10 MHz is measured in the same procedure after being down converted to 1 kHz using heterodyne detection technique. A double step technique is introduced in measurements at 9 kHz and 10kHz to keep high accuracy results due to increasing of the IVD uncertainties. Higher dynamic range is obtained by installing toroidal ferrite chokes in the system to minimize common-mode leakages in the kilohertz frequency range. The measurement capability is expected to be larger than 60 dB with the expanded uncertainty range starting from 0.0016 dB.
ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without ... more ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without source and load being matched to the line impedance. Insertion loss measurements to the DUT and to the DUT fitted by quarter-wavelength lines are carried out, then the attenuation is obtained simply, unrelated to the source and load reflection coefficients. Experiment results on two 20-dB attenuators at 11 GHz show good agreements with those being impedance matched.
Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method ... more Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method for radio frequency(RF) attenuation measurement. Basically, the conversion equation V=kappaEs alpha (alpha=1, kappa=constant) is valid in a proper range of Es where Es and V are RF input and IF output amplitudes, respectively. This paper discusses the possibility that alphane1
2008 Conference on Precision Electromagnetic Measurements Digest, 2008
ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without ... more ABSTRACT An accurate RF attenuation measurement, with small mismatch effect, is achieved without source and load being matched to the line impedance. Insertion loss measurements to the DUT and to the DUT fitted by quarter-wavelength lines are carried out, then the attenuation is obtained simply, unrelated to the source and load reflection coefficients. Experiment results on two 20-dB attenuators at 11 GHz show good agreements with those being impedance matched.
2004 Conference on Precision Electromagnetic Measurements, 2004
Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method ... more Linearity of heterodyne detection is important in intermediate frequency(IF) substitution method for radio frequency(RF) attenuation measurement. Basically, the conversion equation V=kappaEs alpha (alpha=1, kappa=constant) is valid in a proper range of Es where Es and V are RF input and IF output amplitudes, respectively. This paper discusses the possibility that alphane1
2019 IEEE Conference on Antenna Measurements & Applications (CAMA)
Attenuation standards in the frequency range of 9 kHz to 50 GHz have been established at the Nati... more Attenuation standards in the frequency range of 9 kHz to 50 GHz have been established at the National Metrology Institute of Japan (NMIJ/AIST) for ensuring traceability of antenna and EMC measurements in Japan. The standards were realized by two originally developed precision attenuation measurement systems based on the intermediate frequency (IF) substitution method. The first system works in the frequency range of 9 kHz to 1 GHz, built in the highest accuracy dual channel null detection configuration using an inductive voltage divider (IVD) at 1 kHz as IF reference standard. The second system functions to extend the frequency range of 1 GHz to 50 GHz, built in a simple single channel configuration using a step attenuator at 30 MHz as IF reference standard. Traceability of the IVD is obtained directly to the Japan national standard of low-frequency voltage ratio, however, the traceability of the step attenuator standard is obtained through calibration using the first system. Attenuation calibration and measurement capabilities range from 0 to 110 dB with a frequency range of 9 kHz to 50 GHz and an expanded uncertainty range of 0.002 dB to 0.068 dB.
2020 Conference on Precision Electromagnetic Measurements (CPEM)
Primary standard of attenuation in the frequency range of 1 kHz to 10 MHz is developed to meet th... more Primary standard of attenuation in the frequency range of 1 kHz to 10 MHz is developed to meet the demands in recent EMC regulations that require traceability of measurements to national standards. A null detection system with an IVD as a reference standard is constructed to allow attenuation at 1 kHz, 9 kHz, and 10 kHz to be measured accurately by comparing to the voltage ratio of the IVD. Attenuation in the frequency range of 100 kHz to 10 MHz is measured in the same procedure after being down converted to 1 kHz using heterodyne detection technique. A double step technique is introduced in measurements at 9 kHz and 10kHz to keep high accuracy results due to increasing of the IVD uncertainties. Higher dynamic range is obtained by installing toroidal ferrite chokes in the system to minimize common-mode leakages in the kilohertz frequency range. The measurement capability is expected to be larger than 60 dB with the expanded uncertainty range starting from 0.0016 dB.
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Papers by Anton Widarta