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Hishamsaleh
Joined: 06 Jan 2003
Posts: 100
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 12 Jan 2003 17:57 Frequensy shift modulation and phase modulation!!! |
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through bulding antenna... an array antenna to get a scaning beam probagation I need to change phase shift of transmetted signal to let the beam scan the area needed.. how can I do that... I need onlythe idea of how to design my transmitter. a block diagram or what ever...
thanks
ya! the problem is that i couldn't get a useful diagram or design to change the phase w/t changing the frequency!
Am I lost in this????
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Google
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12 Jan 2003 17:57 Ads |
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Hishamsaleh
Joined: 06 Jan 2003
Posts: 100
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12 Jan 2003 18:06 I want to scan this beam! |
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| this pic may help u... the main beam is what i need to rotate... lets say from 45 to -45 degree...
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sick_man
Guest
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| 12 Jan 2003 18:40 |
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phase modulation is easily done
by using a varicap diode at the referance xtal in the pll
this way you freq modulate the referance oscillator of the pll a little this results in phase modulation of the carrier
another way is too do a similar thing too the vco
but this gives phase freq modulation so is no use too you
stick to also feeding audio as i described to the referances
i hope i helped
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MonkeyBusiness
Joined: 16 Jan 2003
Posts: 42
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16 Jan 2003 15:19 Maybe you can use adaptive array techniques |
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When implementing scanning arrays you usually use several antenna elements (dipoles for example), and the beam direction is determined by the relative phase shift between the elements.
A simple way to create a phase shift is to insert a delay line in the path of each antenna element.
Practically this can be easily done by switching transmission line sections in and out of the feed path.
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Hishamsaleh
Joined: 06 Jan 2003
Posts: 100
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| 16 Jan 2003 16:49 |
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| EM algoritms like FDTD (XFDTD,ZELAND,CST MWS,ANSOFT)
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Hishamsaleh
Joined: 06 Jan 2003
Posts: 100
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| 16 Jan 2003 16:49 |
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| I think that CST MWS is the best choice !
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