Designing a broadband matching network

Re: broadband matching

Hi
THe best source for your problem is this book
Solid State Microwave Amplifier Design
by: Tri T Ha

Re: broadband matching

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

Re: broadband matching

Thanks.

Re: broadband matching

bingjiang99 said:

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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broadband matching

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@sohu.com.
Thanks again!
Lu

Re: broadband matching

do you try use more stage to do the matching. for example , use two LC circuit

Re: broadband matching

Thank you. However, it won't help by using several stages.

asoscjn said:

do you try use more stage to do the matching. for example , use two LC circuit

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