High Power Transmission Using Contactless Microwave Transition on an Emdrive Setup

Abstract

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 range at 2.45 GHz without any visible mechanical effect on a 10 mg precision balance, contrary to a previous coaxial cable. This device appears useful to every EMDrive setup and can be easily implemented.

Straightforward Emdrive Setup Using a Microwave Contactless Transition: First Results on Frustum Cavities

“…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.…”

“…The elimination of the parasitic thermal effect of the coaxial cable, using the contactless feeding device [5] together with almost instantaneous measurement and Shaker calibration, makes the new force measurement protocol radically different from that of our reference [4] and others [1,3]. No need to postprocess the measurement data to extract an EMDrive-like force: this improved setup is straightforward.…”

“…The measurement runs presented in Section 4 (see Figures 4,5,and 6) are composed of a calibration step immediately followed by a powering-up phase. The first operation (t ≈ 5 s) is therefore a deposit of a 20 mg standard weight on top of the Shaker configuration to make sure that the balance is able to measure at least a 0.2 mN force under these experimental conditions.…”

“…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.…”