[hamdani yusuf (OP)]

It's been a while since the last time I made a video on microwave transceiver. Here's a good demonstration using dipole antennae to explore the behavior of microwave when not directed by horn antenna.

[hamdani yusuf (OP)]

I've made a new video investigating diffraction of microwave using metamaterials. Previously, it was shown that an aluminum plate, which virtually reflects all of microwave power, didn't show any observable diffraction effect. This time, we tested if diffraction effect can be observed in a partially transparent obstacle which is constructed as metamaterial. The metamaterial obstacle is made from an array of aluminum stripes. There will be some follow up videos to eliminate some uncertainties around diffraction phenomenon.

[vdblnkr34]

Make a Macrowave gun, Nanowave gun, Pikowave gun.  Add some more magnets to see what it will do, remove them to see what it do, make a loner coil or bigger, add some iron core into it or ferrite. etc...

People able to melt metals in microwaves this days. They create dielectric wall and inside metal start melting, check you tube. Find out why it does that. And make very powerful metal melting machine, that melts anything on its way. 

[hamdani yusuf (OP)]

There are already many ways to melt metals. That's not the goal of starting this thread.
Microwave was chosen due to its convenient wavelength to build metamaterials to investigate its behaviours.

[vdblnkr34]

Ok. I have a question.

What material protects from this waves? Grounded peace of metal would be enough?

[hamdani yusuf (OP)]

Ok. I have a question.

What material protects from this waves? Grounded peace of metal would be enough?

Even ungrounded peace of metal sheet can prevent the wave to pass through, providing that it can generate adequate reactional electric field to cancel out the oscillating electric field of the incoming wave. In general, higher intensity wave requires thicker material to block.

[hamdani yusuf (OP)]

I've made a new video investigating diffraction of microwave using metamaterials. Previously, it was shown that an aluminum plate, which virtually reflects all of microwave power, didn't show any observable diffraction effect. This time, we tested if diffraction effect can be observed in a partially transparent obstacle which is constructed as metamaterial. The metamaterial obstacle is made from an array of aluminum stripes. There will be some follow up videos to eliminate some uncertainties around diffraction phenomenon.

Here it is. I hope you enjoy it.

[hamdani yusuf (OP)]

Edge effect on diffraction of microwave.

[hamdani yusuf (OP)]

I've recorded two new experiments using microwave transceiver. The first investigates the effect of polarized diffraction in microwave. The other one revisits the experiment with conjoined twin polarizer with slight change in the setup, but shows some significant results. Stay tuned.

[GertrudeFranklin]

So?
What do you have to say as a result?
We are waiting and curious.

[hamdani yusuf (OP)]

So?
What do you have to say as a result?
We are waiting and curious.

I've just finished the editing. But since the videos are quite large, I"ll upload them when I get access to a reliable internet connection.

Do you really want a spoiler?

Spoiler: show

- Polarization state of the  diffracted wave is determined by polarization of the source, as well as the obstacle.  It's not so surprising if you are already informed of my other experiment on polarized diffraction of light.
- The conjoined twin polarizer can rotate polarization of incoming microwave. It should not be surprising either if we consider that ordinary polarizer can do the same.
- The sequence of polarization axis of the conjoined twin polarizers determines the transmission of the microwave.
In my previous video on conjoined twin polarizer, the electrical conduction between the two polarizers seem to remove the effect of the sequence.

[GertrudeFranklin]

Ok, I got you. I'll wait

[GertrudeFranklin]

Or even if there are some little spoiler details - I am ready

[hamdani yusuf (OP)]

Here's the first one, showing the effect of polarized diffraction in microwave.

[hamdani yusuf (OP)]

Here's the other one.

In this video we will revisit the experiment of microwave transceiver on conjoined twin polarizers. This time the polarization axis of the transmitter is perpendicular to the receiver. It will show how much microwave polarization axis is rotated by the polarizers.

You can compare the result with previous experiment on separated twin polarizer in reply#77
https://www.thenakedscientists.com/forum/index.php?topic=66414.msg619477#msg619477
And the first experiment on conjoined twin polarizer in reply#78
https://www.thenakedscientists.com/forum/index.php?topic=66414.msg619552#msg619552