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power divider

 
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nurul
Antenna Theory Regular


Joined: 26 Apr 2011
Posts: 23

PostPosted: Thu Dec 01, 2011 11:52 am    Post subject: power divider Reply with quote

hello,

a power divider is used to split the power source to a number of antenna. I normally see power divider being divided to 2,4,8 and ...

How can I use a power divider if I only have an array of 7 antennas? is it ok if I use 1 to 8 power divider and I use a terminator at one of the end of the power divider?

thanks in advance for the reply.
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bigSteve
Antenna Wizard


Joined: 14 Mar 2009
Posts: 265

PostPosted: Thu Dec 01, 2011 6:31 pm    Post subject: Reply with quote

If you don't mind the wasted power of having one of 8 ports terminated in a loss, it is fine to do it that way. Just make sure the termination you use has an impedance similar to the other antennas.
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qcu89
Antenna Theory Regular


Joined: 01 Nov 2011
Posts: 13

PostPosted: Thu Dec 01, 2011 7:27 pm    Post subject: Reply with quote

I've heared that you can combine for example two dividers to get the results but i don't know how it works.
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bigSteve
Antenna Wizard


Joined: 14 Mar 2009
Posts: 265

PostPosted: Thu Dec 01, 2011 9:42 pm    Post subject: Reply with quote

I think you are talking about cascading.

That is, if you take a 2:1 power divider, it has two outputs, each with half the power. Then you feed each output into 2 distinct 2:1 power dividers, and then you have 4 outputs each with 1/4 of the initial power......
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wolberine
Antenna Theory Regular


Joined: 01 Mar 2011
Posts: 35

PostPosted: Fri Dec 02, 2011 1:38 pm    Post subject: Reply with quote

If you don't want to waste power, is there a reason it would be bad to put a combiner onto two of the ports?

The power wouldn't be evenly distributed, but at least it wouldn't be wasted.
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qcu89
Antenna Theory Regular


Joined: 01 Nov 2011
Posts: 13

PostPosted: Fri Dec 02, 2011 2:39 pm    Post subject: Reply with quote

My friend made divider 1:3 on kapton and it works pretty well so you can design something like that if you have software(he was desiging in CST microwave studio)
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