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Old 10-17-2005   #1 (permalink)
snarfer
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Flat Pannel Aerials
Hi,

I am currently working on a Power over Ethernet project at home. I have never built an aerial and want a flat pannel aerial to be attached on the box that I have. This is for a frequency of 2.4GHz. Distance is not that much of an issue at the moment, also I would like it to be semi-directional if at all possible. Would any body be able to help me out or give me some advice on creating an aerial that would suit my needs?

Regards,

Oliver Neighbour
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Old 10-17-2005   #2 (permalink)
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Quote:
Originally Posted by snarfer
Hi,

I am currently working on a Power over Ethernet project at home. I have never built an aerial and want a flat pannel aerial to be attached on the box that I have. This is for a frequency of 2.4GHz. Distance is not that much of an issue at the moment, also I would like it to be semi-directional if at all possible. Would any body be able to help me out or give me some advice on creating an aerial that would suit my needs?

Regards,

Oliver Neighbour
Have you checked out all the information provided in the Antennas FAQ on this forum? Everything from Pringles cantennas to antenna theory to RF calculus. I'll even provide you a linky thing to get you started. Have fun exploring and learning!
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Old 10-17-2005   #3 (permalink)
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Quote:
Originally Posted by snarfer
Hi,

I am currently working on a Power over Ethernet project at home. I have never built an aerial and want a flat pannel aerial to be attached on the box that I have. This is for a frequency of 2.4GHz. Distance is not that much of an issue at the moment, also I would like it to be semi-directional if at all possible. Would any body be able to help me out or give me some advice on creating an aerial that would suit my needs?

Regards,

Oliver Neighbour
What does one have to do with the other?
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Old 10-17-2005   #4 (permalink)
snarfer
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PoE
Well the wireless access point is incorporated in the box that I have built, which is going to sit at the top of my house. The aerial is just to connected to it. Its just a little bit of an experiment thats all.
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Old 10-17-2005   #5 (permalink)
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Quote:
Originally Posted by snarfer
Hi,

I am currently working on a Power over Ethernet project at home. I have never built an aerial and want a flat pannel aerial to be attached on the box that I have. This is for a frequency of 2.4GHz. Distance is not that much of an issue at the moment, also I would like it to be semi-directional if at all possible. Would any body be able to help me out or give me some advice on creating an aerial that would suit my needs?

Regards,

Oliver Neighbour
Quote:
Originally Posted by snarfer
Well the wireless access point is incorporated in the box that I have built, which is going to sit at the top of my house. The aerial is just to connected to it. Its just a little bit of an experiment thats all.
Two posts in and you still havn't defined what your needs are. Are we simply expected to read your mind?
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Old 10-17-2005   #6 (permalink)
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Originally Posted by The Others
Two posts in and you still havn't defined what your needs are. Are we simply expected to read your mind?
Apprently so, can you guess what I'm thinking right now?
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Old 10-17-2005   #7 (permalink)
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Originally Posted by streaker69
Apprently so, can you guess what I'm thinking right now?

Yes I...

Wait I think you...

















































I'm getting nothing here!
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Old 10-17-2005   #8 (permalink)
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You can't read his mind unless he takes off this:
Attached Images
File Type: jpg tfh.jpg (35.2 KB, 83 views)
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:00475160 0E A6 AE A0 19 E3 A3 46 .......F
:00475168 0D 65 17 0C 53 70 6F 6F .e..Spoo
:00475170 6E 66 65 65 64 65 72 2E nfeeder.
:00475178 45 78 74 72 61 6F 72 64 Extraord
:00475180 69 6E 61 69 72 65 5D 3B inaire];
:00475188 8B 9E 92 5A FF 5D A6 F0 ...Z.]..
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Old 10-17-2005   #9 (permalink)
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Quote:
Originally Posted by snarfer
Hi,

I am currently working on a Power over Ethernet project at home. I have never built an aerial and want a flat pannel aerial to be attached on the box that I have. This is for a frequency of 2.4GHz. Distance is not that much of an issue at the moment, also I would like it to be semi-directional if at all possible. Would any body be able to help me out or give me some advice on creating an aerial that would suit my needs?

Regards,

Oliver Neighbour
Why does it need to be PoE? Have you researched what is all involved in doing PoE? do yo know your limitations?
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Old 10-17-2005   #10 (permalink)
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Yeah, apparently Cat 5 can only handle about 12 amps
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Old 10-17-2005   #11 (permalink)
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Quote:
Originally Posted by King_Ice_Flash
Yeah, apparently Cat 5 can only handle about 12 amps
No, that's not right, it's the CAT# x # of Conductors.

Therefore it's 5 x 8 = 40amps.

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Old 10-17-2005   #12 (permalink)
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Quote:
Originally Posted by theprez98
You can't read his mind unless he takes off this:
You ain't right.
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Old 10-18-2005   #13 (permalink)
theprez98
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Originally Posted by G8tK33per
You ain't right.
Why thank you, very much.
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:00475160 0E A6 AE A0 19 E3 A3 46 .......F
:00475168 0D 65 17 0C 53 70 6F 6F .e..Spoo
:00475170 6E 66 65 65 64 65 72 2E nfeeder.
:00475178 45 78 74 72 61 6F 72 64 Extraord
:00475180 69 6E 61 69 72 65 5D 3B inaire];
:00475188 8B 9E 92 5A FF 5D A6 F0 ...Z.]..
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Old 10-18-2005   #14 (permalink)
skizziks
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Flat Panel Aerials
For POE they pair up the blue and blue/white for positive DC and brown and white/brown for negitive DC. They pair up the wires because of the voltage drop on longer cables.
My advise for making a Flat Panel Aerial is do not attemp it unless you are an engineer with the right tools for designing pc boards and know somthing about RF circuit design. A Flat Pannel Aerial is a complicated design and most of the larger Flat Panel Aerials contain an array of smaller Aerials acting as one large Aerial.
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Old 10-18-2005   #15 (permalink)
Starpoint
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Quote:
Originally Posted by King_Ice_Flash
Yeah, apparently Cat 5 can only handle about 12 amps

In theory it could handle 12 amps...course you would need to use ALL 8 wires for the positive, and another segment of cat 5 and all of its 8 wires for the negative.

It should handle it for a few minutes before meltdown.

the spec however states 44-56 VDC with up to 350mA so... let em fry his antenna
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