In order to calculate the reflection coefficient, incident and reflected waves need to be measured. The purpose of the directional coupler is to capture reflected signal coming from the DUT. Reflection Coefficient MeasurementĪ reflection coefficient measurement can be performed using a third-party directional coupler, e.g. The plot now displays the ratio between the two signals, i.e., the transmission coefficient.įigure 4: Transmission coefficient of the BLP-300+ low-pass filter from Mini-Circuits. To obtain the transmission coefficient, select the Incident wave in the History sub-tab and set it as the reference. Sweep Input Signal 1 using the Sweeper Tab in LabOne over the frequency range of interest.įigure 3: Transmission measurement and calibration setup.Connect the device under test (DUT) between Signal Output 1 and Signal Input 1 as shown in Figure 3.
The transmitted wave can be measured by performing the following steps:
The incident wave can be measured as follows: To calculate the transmission coefficient, the transmission and incident waves need to be measured. Zurich Instruments UHFLI Lock-in Amplifier.\Ĭombined with a directional coupler, the UHFLI can be used to measure transmission and reflection coefficients and perform a simple 1-point calibration through the LabOne ® user interface. The reflection coefficient (Γ), or S-parameter S 11, is the ratio of the reflected signal voltage to the incident signal voltage: Often, the term S-parameters (scattering parameters) is used to describe reflection and transmission coefficients. Non-Contact Atomic Force Microscopy (NC-AFM)Ī vector network analyzer (VNA) measures the amplitude and phase of the wave quantities and uses these values to describe the high-frequency characteristics, such as reflection and transmission, of the device under test (DUT). Multi-Frequency Atomic Force Microscopy (MF-AFM) Tunable Diode Laser Absorption Spectroscopy Magnetometry with Ensembles of NV Centers Quantum Computing with Superconducting Qubits
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