Wireless Electric Transmitting

Why?

Google "radio" maybe?

If you want to see electric POWER being transmitted, see this link:

http://www.witricity.com/

It might be nice if they actually explained this, rather rather than merely producing cute graphics.

Of course, if the receiving antenna completely surrounds the transmitter, it might be able to capture 100% of the radiated energy. But otherwise...inverse square law, anyone?

If it's laser or microwave, they need to change their picture.

Just how much electric energy are we talking about?

Do you mean the Witricity people ? If so, i believe they have reached the level of being able to charge electric cars....

http://www.witricity.com/pages/technology.html

Lots more from MIT, where this research is being conducted.

if someone having more iron content enters in that room he gets some magical powers.

I tried this once, but the dog drank the water and slobbered in my glass.

Be nice Lynch, maybe Tesla missed something

Tesla transmitted through the earth, not the air.

Not unless all those fancy sparks coming off the toroid are just for show. Touch them, I dare you.

that was different equipment. with that equipment he was trying to generate lightning.

It is currently is common usage, as seen on America's Got Talent with the group "Arc Attack"

The Wardenclyffe and Colorado Springs power generation stations were much larger models of the open air mutual inductance coil. The power was produced at the discharge sphere, toroid, etc. depending on the construction. The Arc Attack team used a SSGTC.

Tesla was using the ground as a counterpoise to take advantage of what would later be termed as the Schumann resonance. Tesla had already discovered the physics behind generating electricity over long distances using ducting of energy in the Schumann cavity between the ionosphere and the earth. The energy is from the top of the coil, which is why it reaches for ground.

Is the sprinkler the oscillating type?

Come on guys...

i read in some other thread today that CR4 members are becoming "curmudgeons" and unwilling to change.

Let's not be like that. Please give an open mind to this new technology. It may not amount to anything, but...let's see where it goes.....

1. This is from MIT, no less.

2. There is 44 page patent granted to Dr Soljacic..7825543.pdf

3. Fujitsu have something going on to charge cellphones. Fujitsu

4. The power transfer will only happen when the emitter and receiver are in resonance. Power is not being scattered over the landscape indiscriminately....

Power transmission over short ditances for recharging purposes e.g Electric vehicle/mobile phone etc is feasible but arguable pretty pointless...hmm there's prob a joke there.
In fact I'm sure there would be a way of refueling a convention car without having to open the fuel cap, get out and stuff a hose in, but is it necessary?
For electric vehicles, maybe unattended contactless charging whilst parked does have some value.
I don't really consider these application to be power transmission, which to me implies a greater range.
Blimey I've even bored myself now.
I only get curmudgeonly because these same old chestnuts keep resurfacing and the poster obviously hasn't bothered to search this site for similar threads, but that's ok, I'm supposed to do the searching instead...
grumpy Del _{(I got a sore throat... all together Ah... poor poor puss)}

power and signal please explain.

Is that addressed to me?

These are simply "loosely coupled resonant circuits", which is basically what a Tesla coil is. This >100 year old idea is being revisited because modern electronics are being designed with very high efficiency and very low power needs which may be served by a low power wireless transmission method. Some wireless power transfer over a short (< 1m) distance is possible and new gadgets like "charging pads" may actually fill a good consumer niche. There is nothing really special here. While MIT is a top university, media over-hyping simple research and lab experiments does a disservice to both MIT and to the general public. (That's what makes me grumpy )

What about distances on the order of 10m? With many people already freaking out about the EXISTING soup of EM waves we live with every day, does anyone realistically think that increasing this EM soup several orders of magnitude (just to avoid pugging in) is a good idea?

Most of the advancement in industries and applications that are relying on the contacting connectors, physical are more prone to failure and wireless power is the most reliable problem solver over here.

In the 1890s, Nikola Tesla experimented the Wireless Power Transfer although it came into action only in the last decade and today if you see; most of the devices uses the wireless technology like mobile, Internet, Bluetooth, cordless phone etc. It is also common in inductive coupling, resonant power transfer, Inductive Power transfer etc. Each of these devices follows the transmission of power from a power source without any connectors to the electric load in short wireless.

Working of Wireless power

Through an oscillating magnetic field the transmission of load power from transmitter to receiver is the basis of Wireless technology. By specifically designed electronics into the transmitter you can achieve this by converting a DC supply to the power source into high frequency alternating current.

For generating a magnetic field alternating current induces a copper wire coil in the transmitter. In the receiver coil the field can induce an alternating current within the proximity of the magnetic field where the coil is placed.

The usable power or the DC current is produced by converting the alternating current by the electronics within the system.

1.The AC signal passing though the electronic transmitter circuit is converted into an AC signal by the mains voltage.

2.A magnetic field induced within a transmitter coil is extended into the receiver coil by the AC current.

3) The current flowing through the coil of the receiving device is generated by a magnetic field. Magnetic or Resonant coupling comes from the name where energy is transmitted between receiver coil and transmitter. The power for the device or the DC current is produced by converting the current flowing into the receiver coil.

Define Resonance

Resignation happens at the same frequency between the distance at which energy can be transferred between transmitter and receiver coils.

An object vibrates naturally at a frequency similar to tuning fork at a particular frequency for achieving maximum amplitude is called resonant frequency.

Advantages of Wireless Power

•Cost reduction with respect to maintaining direct connections (like those in the traditional slide ring).

•Greater comfort for the usage of every day electronics.

•Safe power transmission without any loss of data.

•For reducing the risk of corrosion such as oxygen and water, electronics can be insulated.

•High mobile industrial equipment and continuous power supply.

•Irrespective of wet or dirty environment surrounding power supply is successful.

Thus it can be said that wireless transfer plays a major role today when compared to physically wired connection which are slowly getting outdated. The future of wireless transmissions can also lead to developing smart home like today’s smart phone.

For more information join the electrical training institute in Pune to be a successful electrical engineer.

Charging roads

Thank you for the good insight into this. Here is what we can look forward to...

"i read in some other thread today that CR4 members are becoming "curmudgeons" and unwilling to change."

Be, or Be Not! There is no Becoming!

Oh i don't know....when i was 10 years old, i knew everything. i was very impatient with my father who seemed so stupid. Funny how smart he became as i grew older.

Today, at 66, i know how much i don't know .... i am curious, willing to learn from anyone, young or old....i was a curmudgeon at 10, and slowly un-became one

You seem to be confusing "power" and "signal" transmission.

If you were transmitting power - why would you need to amplify it?

Or is this, as has been suggested, just about wireless signal transmission?

Please clarify.

Perhaps we can call this a loosely coupled air-core transformer. (The farther apart the primary and secondary coils, the looser the coupling.)

The first link (post 2) shows what looks like rather uniform spherical radiation. The second link (post 5) is better. Just like two nearby magnets with a relatively more concentrated flux between, the two coils (send/receive) can have higher flux between them. The closer they are to each other, the stronger the directionality.

Right ... let's step back and see where we are.

1. The OP wanted RF transmission. Not magnetic resonance. Maybe it is Tesla/Marconi/Bell/ even Don Ameche suddenly reincarnated (we Indians believe in it strongly you know) and seeing ... hold your horses .... NO LAND LINES !!! Only cell phones. So, naturally the question.

2. i mentioned WiTricity in good faith. Trying to help the OP. i knew that this was done by Soljacic and team in 2007. Many blogs on CR4 on this. No big commercial success yet i guess? So, maybe the curmudgeons are right after all...still, people, i wish they would succeed with one of those breakthroughs...i would love to see my cellphone charging by itself. After all, we have many 'mobile charging centres' at airports with lots of adaptors hanging. Also 'laptop centres' with many sockets..... would be nice to get rid of all of them.

Right ... let's step back even further and see where we are.

1. The OP wanted to "transmit the electric energy" [sic].

2. The OP also wanted to demodulate and amplify the signal (to paraphrase).

I have asked the question, and it has not been answered - is this about transmitting (useful) power, or just a naïve request for information about radio (AKA wireless transmission)?

This is yet another example of the evanescence of Guest.

"amen" to that ~

Why didn't EVERYONE fully read the OP, and simply pause a moment ... "take-it-all-in" before replying.

[OP] --- "i want to transmit the electric energy by the one transmitting antenna and at the receiving end use the other antenna which recieve the RF signal. At the recieving end i'm using demodulator then the signal is amplified. --- so pls. suggest me the circuit by which it will possible, there is no need of high efficieny."

Ahem ... "yup" ... What are the chances that THIS guy knows ANYTHING about ANYTHING?

How much you wanna bet the guy can't EVEN find his way BACK here to check for answers...?!

Send me one-o-them Honorary_Curmudgeon certificates, NOW!!!

IMHO , y'all are contributing to the downfall of this (what was once a *most* interesting) site by encouraging such dufuses to keep posting such innane gobble-de-gook, creating such lengthy drivel-ridden razzmatazz-filled threads.

Just my 2 pesos, fer whut they're wurth.

We still don't know HOW MUCH energy the OP was needing. There are "wireless" electric transmission systems available, just not a lot of energy. Balluff for example has a wireless energy transfer system that can power up sensors on moving components across small air gaps, 10mm max. at 300ma. Not much, but it is "wireless electric transmitting". But if we are talking about large amounts of energy, the problems become logarithmic with distance and power.

Maybe the problems are not insurmountable, but so far nobody has been able to get there.

Try this Nikola Tesla envisioned a world where there was no need for electrical wires.

http://www.tfcbooks.com/tesla/1904-03-05.htm