Question about microwave reflections

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    Experiment Microwave
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Discussion Overview

The discussion revolves around the best materials to use for holders in an experimental setup involving microwaves, specifically focusing on reducing unwanted scattering of microwaves in a vacuum environment. Participants explore various material properties and their interactions with microwaves.

Discussion Character

  • Exploratory, Technical explanation, Experimental/applied

Main Points Raised

  • One participant suggests that aluminum will reflect microwaves like a mirror, while edges or wires may cause diffraction.
  • Another participant notes that solid insulators such as glass, plastic, or ceramics will refract microwaves, with thin glass fibers or low-density ceramic foam being particularly transparent.
  • A different participant requests more details about the experimental setup, including the microwave band and transmission level, and mentions the importance of compliance with EMI regulations. They also propose the use of EM absorbent cone material to mitigate stray reflections.
  • One participant proposes that wood could be beneficial due to its slightly lossy nature with respect to microwaves.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of various materials, indicating that multiple competing perspectives exist regarding the best options for reducing microwave scattering. The discussion remains unresolved as no consensus is reached.

Contextual Notes

Some participants have not provided specific details about the experimental conditions, such as the frequency range of microwaves or the power levels used, which may affect the applicability of their suggestions.

kelly0303
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Hello! I have an experimental setup in which I need to send microwaves (MW). I would like to reduce the unwanted scattering of the MW as much as possible and I was wondering what materials are best for this (in vacuum). For example, if I make some holders of metal (e.g. aluminum or steel) I assume they will affect the MW trajectory. If I make them of ceramics for example would that help i.e. do microwave interact with ceramics?
 
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To microwaves, aluminium will be like a mirror, while the edges, or wires, will diffract the beam.

Solid insulators, like glass, plastic or ceramic, will behave like a lens, so will refract the beam.

The most transparent will be thin glass fibres, or a low density ceramic foam.
 
kelly0303 said:
I have an experimental setup in which I need to send microwaves (MW). I would like to reduce the unwanted scattering of the MW as much as possible and I was wondering what materials are best for this (in vacuum).
Can you give any more details of the experiment? What band of microwaves and at what Tx level? Are you sure you will be compliant with EMI regulations outside of your lab?

More details would help, but have you looked at EM absorbent cone material to absorb any stray reflections? The material is commonly used in RF anechoic chambers and in places where you want to absorb EM:

1719323165805.png

https://theemcshop.com/anechoic-cha...-expandable-polypropylene-microwave-absorber/
 
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I think wood might be useful as it is slightly lossy to microwaves.
 

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