David Ulm
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View article: Influence of LO cable movements on VNA measurements using Frequency Extensions
Influence of LO cable movements on VNA measurements using Frequency Extensions Open
In this study, the impact of local oscillator cable movements or drift during VNA measurements using frequency extenders is investigated. A non-reciprocal measurement error caused by alterations of the local oscillator signal in R 900 (WR …
View article: Achromatic Quarter-Waveplate for the Terahertz Frequency Range Made by 3D Printing
Achromatic Quarter-Waveplate for the Terahertz Frequency Range Made by 3D Printing Open
Here we propose a 3D printed form-birefringent achromatic quarter-waveplate targeting the lower terahertz frequency range. The monolithically fabricated waveplate consists of three individual layers of different thickness and orientation o…
View article: Report describing the comparison of material parameter measurements at millimetre-wave and THz frequencies
Report describing the comparison of material parameter measurements at millimetre-wave and THz frequencies Open
This pilot study was part of the EMPIR (18SIB09) TEMMT project and was registered as the EURAMET 1514 comparison. Therein, different methods for material parameter measurements in the THz spectral range were compared. The different measure…
View article: High-resolution signal-in-space measurements of VHF omnidirectional ranges using UAS
High-resolution signal-in-space measurements of VHF omnidirectional ranges using UAS Open
In this paper, we describe measurement results of the signal-in-space of very high frequency (VHF) omnidirectional range (VOR) facilities. In aviation VOR are used to display the current course of the aircraft in the cockpit. To understand…
View article: Results of the national antenna intercomparison 2017/2018 within the German Calibration Service (Deutscher Kalibrierdienst – DKD)
Results of the national antenna intercomparison 2017/2018 within the German Calibration Service (Deutscher Kalibrierdienst – DKD) Open
In an intercomparison organized within the framework of the German Calibration Service (Deutscher Kalibrierdienst – DKD), seven different calibration laboratories participated in the measurement of the antenna factor for three different an…