Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
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Below are all of the forum threads, including all
the responses to the original posts.
T
Post subject: Conjugate match
Unread post Posted: Sun Jan 16,
2005 4:36 pm
Hello all,
What is the reason of matching
a network to a conjugate match?
I know that the conjugate is
the inverse of the phase for a given match.
When is there a need
to do the matching to the conjugate value?
Thanks,
- T
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Len
Post subject: Conjugate match
Unread
postPosted: Sun Jan 16, 2005 6:03 pm
Theoretically, a complex
conjugate match results in maximum transfer of power from the source
to the load.
Len
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Old Tele man
Post subject:
Unread postPosted: Mon Jan 17, 2005 12:15 am
Offline
Captain
Joined: Sun Oct 17, 2004 1:07 am
Posts: 6
Location:
Tucson, AZ
maximum power occurs because with a purely RESISTIVE
load no energy is "stored" so as to create standing/reflected waves...
_________________
Devil sez: "...Yes, but it's a DRY heat!"
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Profile
Guest
Post subject:
Unread postPosted:
Thu Jan 27, 2005 12:34 am
Why conjugate? If Xsource = -Xload
then it is resonant and only the source and load resistances influence
power transfer.
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Old Tele man
Post subject:
Unread postPosted: Thu Jan 27, 2005 11:14 pm
Offline
Captain
Joined: Sun Oct 17, 2004 1:07 am
Posts: 6
Location: Tucson,
AZ
conjugate implies "paired completion"...as: When XL = -XC, the
two vectors "cancel" each other, leaving a purely resistive (R) load...and
NO energy is "dissipated" in either the capacitive- or inductive-reactance,
it ALL goes to the resistive (R) load.
_________________
Devil
sez: "...Yes, but it's a DRY heat!"
Top
Profile
Oleg Pozdeev
Post subject: Re: Conjugate match
Unread postPosted:
Tue Feb 08, 2005 4:10 pm
Len wrote:
Theoretically, a complex
conjugate match results in maximum transfer of power from the source
to the load.
Len
I failed to find a thorough prove
for conjugate match approach, the one published in school books seems
a bit too artificial to me.
I’d suggest an exercise in math.
A
passive 2-port is described by Y matrix and on left hand side is connected
to source with impedance Zs, while on right hand side is connected to
load with impedance Zl.
The power transfer function G(Zs,Zl) can
be derived analytically, and takes max value when
dG(Zs,Zl)/dZs=0
and dG(Zs,Zl)/dZl=0 simultaneously.
One can take a step further
to check whether the solution relates to max (not a min) value.
Under
conjugate match condition there is no reflection between source and
2-port likewise between 2-port and load. The suggested approach gives
similar result if and only if a 2-port is a purely reactive one.
Posted 11/12/2012