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Questions tagged [microwaves]

8 questions
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Can air be ionized using microwaves?

I have been doing a good bit of research lately into a new form of electric "jet engine" developed by researchers in Wuhan, China; in the article summarizing the technologies used to produce this remarkable device, they state that they used a…
CJL
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What are the materials most transparent to microwaves?

I need to build special equipment for a microwave oven ( 2.45 (GHz)). But even glass and plastics do heat up in microwave ovens. Where can I find a list of the materials that are the most transparent to this frequency ? Thanks
Manu de Hanoi
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Homogeneous magnetic field inside aperture of PCB

I need to create a homogeneous magnetic field of a certain strength across a 10mm diameter opening of a PCB by using a current track on said PCB around the opening. The signal sent through the conductor track is a microwave signal of about 3 GHz…
Swoopoo
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Please explain this flatbed microwave design

Here is a Galantz flatbed microwave The waveguide is smaller than a wavelength. 1)Usually apertures of less than a wavelength are considered to block EM wave but not here, why ? 2)The width of the waveguide is 6 cm and the height about 2 cm, does…
Manu de Hanoi
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What's the shortest wavelength that can be created with dipole antenna?

I know that a dipole antenna is used to create/receive radio frequency signals (~1m wavelength), which are waves of the electromagnetic spectrum, same as visible light. Now I was wondering if, by the same physical principle, visible light (400-700…
philohippo
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How to calculate the current sourced by a vector network analyzer?

I am delivering power to my device using a VNA with frequency ranging from 300kHz to 8GHz. I am trying to figure out the current that passes through my sample, or DUT. I can set the output power of the VVNA and measure the S11. Here is my…
Joey
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can I extend the the antenna of a magnetron with a cable?

If I connect a piece of heavy copper wire or copper rod to the antenna cap of a magnetron can I guide the current so that microwaves would be emitted further away ?
Manu de Hanoi
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What is the plastic cover thing for in microwave ovens?

With every microwave oven I have ever had, it has come with a plastic thing that you are (apparently) supposed to put over the food when microwaving it. Some food products mention this and tell you to do it in the instructions, but most don't…
Midian
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