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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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 12 Mar 2003 20:25 90 degree phase shifter |
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Is it posible to design a 90 degree phase shifter using a single PIN diode and microstrip lines??
  
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 12 Mar 2003 21:48 suspect not |
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| The only way I know uses some form of reflection network like a branch line coupler. The signal goes in one input and out the other input. The load on one of the outputs is selected or not by the PIN diode.
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 13 Mar 2003 0:32 Re: suspect not |
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That actually needs two PIN diodes:(
| flatulent wrote: |
| The only way I know uses some form of reflection network like a branch line coupler. The signal goes in one input and out the other input. The load on one of the outputs is selected or not by the PIN diode. |
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huntmine
Joined: 07 Mar 2002
Posts: 39
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| 13 Mar 2003 2:02 use difference amplifier |
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| why do you use the difference or integrate amplifier
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 13 Mar 2003 13:43 |
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conventionally there are required, at least, either two diodes per bit (reflection and loaded-line type) or four diodes per bit(switched line).
I've found a paper (MW and Optical technology letters vol 14 no.2 1997) which makes the analysis with a single diode per bit and compares with a loaded-line type). maybe it is useful to you, but i think that both in match and bandwidth response, conventional ones behave much better
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 13 Mar 2003 14:16 |
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Thanks for the info. I will try to find it out. But for the time being can you please tell one or two sentences about the method they have suggested if you can remember them.
Have a nice time,
| dowjones wrote: |
conventionally there are required, at least, either two diodes per bit (reflection and loaded-line type) or four diodes per bit(switched line).
I've found a paper (MW and Optical technology letters vol 14 no.2 1997) which makes the analysis with a single diode per bit and compares with a loaded-line type). maybe it is useful to you, but i think that both in match and bandwidth response, conventional ones behave much better |
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 13 Mar 2003 18:03 phase shifter |
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better than that, here you have it
regards
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 13 Mar 2003 21:24 Re: phase shifter |
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dowjones,
It is really a nice paper. Thank you very much and really appreciate your efforts.
g86
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Lupin
Joined: 22 Jan 2003
Posts: 326
Helped: 2
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| 14 Mar 2003 9:02 |
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In a -3 dB hybrid coupler, if a mismatched load at the output port 1 (e.g. -15 dB) and the same load at the output port 2... how much is the matching at the input port and the matching at the load port?
I want to compare my considerations with yours.
Regards
Lupin
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jamez
Joined: 15 Jan 2002
Posts: 57
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| 14 Mar 2003 11:57 |
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 Hi,
In a High\low filter network you can use a single pin diode do the 90 degree phaseshift.I have do it as 90 45 22.5 and so on.
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 14 Mar 2003 17:40 |
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H jamez,
I want to know little bit more. Can you please...
regards,
| jamez wrote: |
Hi,
In a High\low filter network you can use a single pin diode do the 90 degree phaseshift.I have do it as 90 45 22.5 and so on. |
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