Can you help me with my project about rf harvesting thanks ^^

[slashx15]

I would like to ask for advice regarding my project, because i'm a bit lost T_T
I am planning to use the ff components:
a ultra wide band micro strip antenna as my receiver
dc to dc converter or charge pump

I have viewed various posts regarding this project but sadly i keep meeting a dead end..

My question is
1. Does ultra wide band has advantage over other types of antenna.. beacuse as i read the frequency that carries the largest amount of power is at 915-920Mhz
2. What soft can i use to design a micro-strip antenna?
3. knowing that rf signal has minimal power, can i integrate series/array of antenna to boost it? (for example: one antenna=1mw; ten antennas=10*1mw=10mw) is my equation right?
4. is their a passive rf amplifier?
5. is the diode 1n34a4 designed as a bridge type able to convert rf to pulsating dc with rf as an input?

Currently new here, i'm not familiar with the forums.. Sorry for the question if it is too many.. Help would greatly be appreciated.

anyone who has already done this type of project? can you pls assist me thanks a lot

 

[betwixt]

The amount of energy you can harvest is very, very, very tiny so don't expect great results.

1. If you know the frequency you can optimize the antenna by making it resonant. Wide band will probably give the poorest results but it depends on individual situations.
2. To get any appreciable power you either have to be in a very strong signal area or use an optimized antenna.
3. Yes, but the signals from the array need to be in phase and this would be extremely difficult, especially if you use a wide frequency range.
4. Power out can not be greater than power in - so the answer is no.
5. 1N34 is a small signal diode and not intended to be used as a power rectifier. Don't forget that a bridge drops twice the voltage of a single diode so you will get even less voltage out.

In summary, it will work but think in terms of getting enough power to light an LED and not even very brightly, and even that depends on you being in a high field strength area.

Brian.

 

[chuckey]

The 1N34a is a UHF germanium diode it is ideal for this sort of job. You won't get any real power out of this kit unless you stand it next door to a transmitting aerial. Ultra wideband aerials trade bandwidth for gain, you really want a narrowband aerial for this application. Such as a 20 element yagi.
Frank

 

[slashx15]

Yes thanks for the replies, after doing some readings i was thinking of using an array of narrowband microstrip antenna, but can anybody tell me is there a software to be used in designing one? thanks in advance ^^