Super Antenna

[Madebymonkeys]

Good gain and omniderectional. (Is there a reason why this is impossible?)

Yes, an omnidirectional antenna cannot be directional, you can only acheive antenna gain by making it directional in one way or another.

The mess of RF (sums and difference frequencies etc) should be rectified by a full bridge rectifier. (This needs HF-Diodes.) Even if the power is minimal, a small 1.2 Volt rechargable batterie could be charged over time.

I doubt you would be able to get 1.2V plus the 2 diode drops out of an antenna like the one you suggest, just a hunch but I suspect you would be looking at mV.
To charge the 1.2V battery you would need 1.2V plus the diode drops.

See the attached circuit. The antenna is the problem. Somewhere a ground connection is also necessary. Be aware that the circuit might not work.

I don't think you need a ground for your loop antenna.

What I want to hear from an expert are technical or theoretical reasons why such a "very broadband antenna" with good gain in all frequencies and omnidrectionality is not possible. One could then do some research on how to overcome these problems.

http://en.wikipedia.org/wiki/Antenna_gain

I found that collecting some power from the 45 Hz or 50 Hz hum (radiation or electromagnetic smog from the 110 Volt or 220 Volt AC mains net) is possible with a very long isolated cable just lying on the ground or hanging at a few meters height. This cable is connected to one AC input of a full bridge rectifier and the ground is connected to the other AC input of the full bridge rectifier. See the second attached drawing. This circuit works, the amount of collected power depends very much on the location. Of course it is quite good in an environment with many big electrical appliances.

How are you measuring the power?

Greetings, Conrad

[Neo-X]

Hi Neo.

This is up one of my favorite ally's, I studied antenna theory say 20 years ago, very interesting to say the least, I look at radio waves as a cool source of potential energy, I like an antenna design in the shape of a full band slice of pie, hexagonal antenna with 6 individual slices that form a radial and omni-directional antenna.

if you need an idea of the design, imagine 3 bow tie antenna's that form a hexagon, pretty simple.

looking forward to your next post.

Jerry

Hi onthecuttingedge2005

Im sorry to say, i have no interest in constructing fractal antenna but I love that movie "The Cutting Edge"... 

[Neo-X]

@Jerry: I always wanted to ask a specialist about a "very broad band antenna". I want an antenna that is pretty good at receiving electromagnetic waves from 60 Mhz to 10 GHz. That would cover most of the radio transmissions in Europe (FM radio, TV, cell phones and WLANs).

I do not want to tune into one specific station (frequency). I want to catch all transmissions in order to convert them into usefable energy (rectification of all received frequencies into DC, e.g. to charge a 1.2 Volt rechargeable battery).

May be you have some ideas? How would such a "very broad band antenna" look like (its geometry)?

Is it possible to build an antenna which receives all frequences in this broad range (60 MHz to 10 GHz) equally well (not equally weakly).

Greetings, Conrad

Hi Conrad

What your thinking is not hard to achieve... The only way to recieve such a very broadband frequency is using long vertical antenna. But the problem is you cant get as much as voltage u need to charge a battery unless you use a extremely long antenna and making such antenna is hard and dangerous becauce of the wind and the potential risk of lightning strike.

[wings]

@Wings: I am afraid, the antennas you mentioned (for sure the fractal antenna and the plasma antenna) still have to be designed or at least tuned into a specific narrow band (narrow range of frequencies). And the frequency range of the Lakhovsky antenna is not clear.

What I want is to receive alle frequencies from 60 MHz to 10 GHz at once or together (seems it is difficult to make myself understood). Not only the station which is the most powerful at a given location, but also all other stations or transmitters weak or strong. So, I want to receive the whole elctromagnetic smog souurounding us with one antenna.

There are some FM radio stations in every area, there are some TV stations, there are a few cell phone towers everywhere, and there are some WLANs everywhere. In Vienna one sees 20 or more WLANS in an aparement building and I see the WLAN in the houses of my neighbour. And I want to receive all that "electromegnetic smog" with one antenna and I want to rectify the whole lot into DC.

The contribuition of each transmitter might be low, but in sum there could be useful power to be fed into a rechargable battery over time.

Whenever I talk to a specialist about antennas I end up with something that is not "very broad band". The specialists just naturally think in "adapting the antenna to the frequency" and think that this is the only thing required. And normaly that is the case, we are normaly only receiving the transmission from one transmitter. And the specialist always has this situation in mind. "What do you want to recieve?" they ask me (meaning "At what frequency does the transmitter transmit"?). And I say "I want to receive everything", and then the specialists "switch of mentally".

Greetings, Conrad

like this
http://hackaday.com/2011/07/11/scavenging-ambient-electromagnetic-energy/

http://www.sciencedaily.com/releases/2011/07/110707131545.htm

http://blogs.discovermagazine.com/80beats/2011/07/15/inkject-printed-antenna-gathers-ambient-energy-from-tv-transmissions/#.UO5Z4Inm6wM


http://gtresearchnews.gatech.edu/device-captures-ambient-energy/

[onthecuttingedge2005]

@Jerry: I always wanted to ask a specialist about a "very broad band antenna". I want an antenna that is pretty good at receiving electromagnetic waves from 60 Mhz to 10 GHz. That would cover most of the radio transmissions in Europe (FM radio, TV, cell phones and WLANs).

I do not want to tune into one specific station (frequency). I want to catch all transmissions in order to convert them into usefable energy (rectification of all received frequencies into DC, e.g. to charge a 1.2 Volt rechargeable battery).

May be you have some ideas? How would such a "very broad band antenna" look like (its geometry)?

Is it possible to build an antenna which receives all frequences in this broad range (60 MHz to 10 GHz) equally well (not equally weakly).

Greetings, Conrad

This might give you a good picture for the type of antenna you are looking for, it could be modified to suit your broad band needs.

http://www.cv.nrao.edu/ntcweb/Pictures/GBSRBSantenna.jpg