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amicloud
Joined: 11 Oct 2004
Posts: 133
Helped: 2
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 11 Mar 2005 10:50 14GHz directional coupler |
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| handle 1W power,20 dB coupled.how to make?how to avoid high frequency effects?
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11 Mar 2005 10:50 Ads |
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borich_03
Joined: 07 Oct 2003
Posts: 145
Helped: 14
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11 Mar 2005 12:16 Re: 14GHz directional coupler |
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| amicloud wrote: |
| handle 1W power,20 dB coupled.how to make?how to avoid high frequency effects? |
Very poor specs! What about bandwidth, directivity? What do you mean by "frequency effects"?
Very good specs you can get by using waveguide structure.
Look at the Pozar's("Microwave engineering") and Matthaei's("Microwave filters, impedance-matching networks...") books. These books are the best for such problems.
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eladg
Joined: 13 Jan 2002
Posts: 208
Helped: 4
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17 Mar 2005 23:09 Re: 14GHz directional coupler |
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| amicloud wrote: |
| handle 1W power,20 dB coupled.how to make?how to avoid high frequency effects? |
use slot line with about 15 dB coupling and 5 dB att ( to improve the directivity)
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mreza1355
Joined: 28 Feb 2005
Posts: 47
Helped: 3
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18 Mar 2005 2:09 Re: 14GHz directional coupler |
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| why don't you use microstrip one?
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XuQing
Joined: 19 Feb 2004
Posts: 50
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18 Mar 2005 8:58 Re: 14GHz directional coupler |
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| Stripline directional coupler is good for your spec.
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elusquinos
Joined: 11 Feb 2005
Posts: 7
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18 Mar 2005 16:28 Re: 14GHz directional coupler |
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| Do you need your coupler in waveguide?
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eladg
Joined: 13 Jan 2002
Posts: 208
Helped: 4
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20 Mar 2005 17:57 Re: 14GHz directional coupler |
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| XuQing wrote: |
| Stripline directional coupler is good for your spec. |
stripline have more loss then microstrip, so i suggest overlay coupler
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XuQing
Joined: 19 Feb 2004
Posts: 50
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22 Mar 2005 7:50 Re: 14GHz directional coupler |
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| Quote: |
| stripline have more loss then microstrip, so i suggest overlay coupler |
That's right , but is tolerable for general case.
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carrier
Joined: 14 Apr 2001
Posts: 341
Helped: 8
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22 Mar 2005 9:29 14GHz directional coupler |
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you can use lang coupler with fr4 microssrip line or wilkinson coupler.
for more information to design this coupler you can:
1- search throgh the google
2- download book "RF circuit design by:ludwic"
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