Figure 3 - uploaded by Jerome Sokoloff
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Picture of the contactless RF transition with blue dielectric support (for preliminary tests). 1, 2, 3 and 4 are the port numbers.
Source publication
In this paper, a contactless microwave transition is described and characterized. In our ``ElectroMagnetic Drive'' (EMDrive) measuring setup, it will be dedicated to transmit high Radio Frequency (RF) powers without any mechanical effort. It exhibits very good matching and transmission performances. It is found to transmit 100 W microwave power ran...
Contexts in source publication
Context 1
... have limited the number of Electromagnetic Band-Gap (EBG) cells. All the dimensions of the contactless transition are specified in the following diagrams (Figures 1 and 2), and pictures of the transition and the EBG structure are displayed in Figures 3 and 4. The part of the transition positioned on the balance (left part in Figures 1 and 3) has been manufactured with a mass reduction effort, which leads to a 670.9 g mass. ...
Context 2
... have limited the number of Electromagnetic Band-Gap (EBG) cells. All the dimensions of the contactless transition are specified in the following diagrams (Figures 1 and 2), and pictures of the transition and the EBG structure are displayed in Figures 3 and 4. The part of the transition positioned on the balance (left part in Figures 1 and 3) has been manufactured with a mass reduction effort, which leads to a 670.9 g mass. ...
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Citations
... For our study, at the LAPLACE Plasma and Energy Conversion Laboratory, we developed a basic setup producing almost instantaneous calibrations and results [4][5][6]. In this paper, we present how we replicated two NASA-like cavities in order to exploit the same electromagnetic configuration, or resonant mode. ...
... The main parts of the LAPLACE's EMDrive experimental setup, depicted in Figure 5, are extensively described in our previous papers [4][5][6]. Actually, the setup configuration is almost identical to that established in reference [6]: the cavities in Shaker configuration, positioned on the precision balance, are fed by the RF power unit through the contactless microwave transition. The two quasi-identical copper cavities are assembled and oriented in opposite directions. ...
... The two quasi-identical copper cavities are assembled and oriented in opposite directions. Combined with an RF switch, this Shaker configuration allows to switch the direction of the hypothetical EMDrive- [5]; (f) power probes collect the incident and reflected powers, (g) and F1 class standard weights are used for the calibration processes of the balance, achieved thanks to (h) the double calibration mechanism. On the left of the enclosure, the monitoring part is made up of (i) the microwave source, (j) the powermeters, (k) a computer for real-time monitoring and control, (l) and the RF switch driver to remotely select which cavity to feed. ...
... To eliminate this parasitic effect, a contactless microwave transition has next been designed. Its characterization is presented in the second publication [5]. It was found to exhibit satisfying electromagnetic performances and to transmit 150 W microwave power without affecting the force measurement. ...
... The main objective of this paper is to present the first EMDrive-like force measurements performed thanks to the assembly of the Shaker configuration with our contactless microwave transition ( Figure 1). This transition has been designed to transmit high microwave power (≈ 150 W) using two separate channels without affecting the force measurement [5]. Although a low gap difference has a minimal influence on the electromagnetic performances of the contactless transition, an effort has been made to maintain an air gap of 3 mm between the two parts of the transition, throughout the whole study. ...
... After the work described in [4] and [5] and for this third step of the EMDrive setup development at the LAPLACE, we are using a simple design of frustum cavity (without any dielectric part) that has been previously simulated and manufactured in two units. These cavities' shape creates an electromagnetic asymmetry (conical angle of 58 • ) seemingly necessary to produce an EMDrive-like force. ...
This paper presents the work of the LAPLACE Electromagnetism Research Group to build an experimental setup able to measure tiny forces that may appear in microwave cavities, in the context of EMDrive investigations. It is based on a commercial balance in the range of 0.1 mN sensitivity, a contactless feeding for more than 150 W RF power, and self calibrating device process. It requires a double cavity system in mirror configuration and is here experimented with frustum cavities, different from the NASA one [1]. The global setup can make force measurement and calibration in less than two seconds. Investigating two different cavities and various electromagnetic modes for the biggest, no force is reported while the 0.1 mN sensitivity is demonstrated.
