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khaled fayed
Joined: 30 Apr 2006
Posts: 4
Helped: 1
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 09 Jan 2008 16:46 broadband matching |
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| Hi, thanks for this important topic! From my experience with matching networks, I suggest that u use AWR (Microwave office). it is very helpfull. u can use its optimizer to design the matching network that u want easily. put multiple sections of L and C. then by setting ur goals and running the optimizer (optimize the L, C and Q factors), u can know what is the Bode-Fano limitations for ur case
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 11 Jan 2008 0:28 Re: broadband matching |
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Thank you.
| khaled fayed wrote: |
| Hi, thanks for this important topic! From my experience with matching networks, I suggest that u use AWR (Microwave office). it is very helpfull. u can use its optimizer to design the matching network that u want easily. put multiple sections of L and C. then by setting ur goals and running the optimizer (optimize the L, C and Q factors), u can know what is the Bode-Fano limitations for ur case |
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microwave_1960
Joined: 20 May 2006
Posts: 8
Helped: 2
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| 12 Jan 2008 18:05 Re: broadband matching |
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| Try http://www.trcpep.com/articles.htm
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IamnotJunk
Joined: 29 Nov 2007
Posts: 39
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| 12 Jan 2008 18:36 broadband matching |
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| Have you used spice to simulate?
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 17 Jan 2008 2:19 Re: broadband matching |
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Yes.
| IamnotJunk wrote: |
| Have you used spice to simulate? |
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AmirMohammad
Joined: 07 Apr 2007
Posts: 13
Helped: 2
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| 31 Jan 2008 16:03 Re: broadband matching |
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Dear luqing
you can study more about real frequency technique at a book named "solid state microwave amplifier design" written by T.T.Ha, although it is not an easy method.
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 02 Feb 2008 2:45 Re: broadband matching |
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Thanks
| AmirMohammad wrote: |
Dear luqing
you can study more about real frequency technique at a book named "solid state microwave amplifier design" written by T.T.Ha, although it is not an easy method. |
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Bibhu166
Joined: 07 Feb 2007
Posts: 10
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| 02 Feb 2008 4:57 Re: broadband matching |
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Hi,
Yeh, matching is what you have said.In this case, it will be very narrow bandwidth as Q is so high.The power will be tranfered when it is matched to 50 ohm, .sO, in band the input resitance should be near about 50 ohm.Witht this low resitance and high Q it is difficult. You may refer Pozar how to match with another LC element.You may match to some intermidiare load.
Regards,
Bibhu
| derek_lkm wrote: |
Hi all,
Find this topic interesting, however i not really sure why the matching is diffcult. From my basic understanding, it would just be made with the movement on the smith chart and its corresponding passive values. I understand that for maximum voltage transfer, we would like a large load, but since we are mentioning about Sparameters, we are interested in power transfer. As long as the matching is done up we should get the maximum power transfer. Maybe i'm wrong or i have taken enough factors into considerations? Would like to hear the views of the gurus out there.
Thanks and wish everyone have a nice day.
Regards
Derek |
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Advark
Joined: 22 Feb 2008
Posts: 58
Helped: 1
Location: Lima-Peru
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| 22 Feb 2008 18:12 Re: broadband matching |
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I found a paper on broadband martching simulation.
Maybe could help you guys.
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 25 Feb 2008 22:11 Re: broadband matching |
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Advark,
Thanks.
| Advark wrote: |
I found a paper on broadband martching simulation.
Maybe could help you guys. |
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saeed131
Joined: 05 Dec 2007
Posts: 22
Helped: 2
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| 11 Mar 2008 19:39 Re: broadband matching |
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Hi
THe best source for your problem is this book
Solid State Microwave Amplifier Design
by: Tri T Ha
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Hamme
Joined: 12 Mar 2008
Posts: 1
Helped: 1
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| 12 Mar 2008 1:14 Re: broadband matching |
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I have read through your problem and the other various answers the solution however is simpler than you would imagine. I am going to assume that L C and R are in series if not its dosnt really matter the principle is the same. You need to add a spoiler to the circuit block which will widden the bandwidth because Qseries= SQRT((X/R)-1) in other words increasing R in series reduces the Q. Or in parrallel Qpar= SQRT((R/X)-1) which in this case add R in parrallel with the existing parallel R to reduce the R. Jobs a good one. I have had to make some assumptions about exctly what it is your CCT does, however the principle is one that is used all the time I hope this can be used in your case. Then just match to the new vaue of the real parts of the source and the load and then resonate out any reactance if you desire to do that. Remember the ultimate Q you can achieve is limited by the real parts of the source and load therefore if you find the remaining real parts still presents too high a Q then match with several cascaded L sections to increase the bandwidth. The more you cascade L section the more the match approaches that of a wide band transmission line. Hope the above is of use.
Good luck
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 12 Mar 2008 2:41 Re: broadband matching |
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| Thanks.
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shirkola
Joined: 11 Mar 2008
Posts: 1
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| 12 Mar 2008 15:11 Re: broadband matching |
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| bingjiang99 wrote: |
Dear all,
I have a circuit block ---R---C---L---, where R (5 ohm) is small, L is large, and C is small. The total impedance Z = R at 915 MHz (L and C resonate). Since the imaginary part can be very large, how can I design a broadband matching network? I have to point out that we can't do anything to the block itself.
Best regards, |
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luqing
Joined: 23 Aug 2007
Posts: 11
Helped: 2
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| 16 Mar 2008 10:43 broadband matching |
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Dear AmirMohammad,
Thank you for your introduction about a book named "solid state microwave amplifier design" written by T.T.Ha, although I cannot find this book.
Can you send an ebook of that one? My email:bg_islang(at)sohu.com.
Thanks again!
Lu
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asoscjn
Joined: 22 Apr 2007
Posts: 10
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| 06 May 2008 13:54 Re: broadband matching |
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| do you try use more stage to do the matching. for example , use two LC circuit
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bingjiang99
Joined: 27 Apr 2005
Posts: 112
Helped: 4
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| 12 May 2008 20:25 Re: broadband matching |
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Thank you. However, it won't help by using several stages.
| asoscjn wrote: |
| do you try use more stage to do the matching. for example , use two LC circuit |
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