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98 Threads found on edaboard.com: **Impedance Transformation**

Hi all,
What does **impedance** **transformation** mean with regards to antenna?
Is this transforming the input **impedance**(Z11) of an antenna to the desired value?
Can an L section using lumped components manipulate the resonant frequency of an antenna?
Regards, Vineeth

Electromagnetic Design and Simulation :: 08.05.2013 11:24 :: Vineeth m p :: Replies: **0** :: Views: **210**

What does **impedance** **transformation** mean with regards to antenna?
For most folk, this means to alter the driving point **impedance** by adding some sort of matching scheme.
This is usually a network of matching components/devices , between the the energy source and the antenna driven point.
Stretching the meaning a little, it might

RF, Microwave, Antennas and Optics :: 12.05.2013 12:16 :: Darktrax :: Replies: **2** :: Views: **237**

Hello,
Is there anybody who already designed a PA that should drive a SAW filter ? Should we provide a particular output **impedance** to the SAW to
reduce VSWR ?
Lots of design papers says that you should transform the load to the optimum load to have best efficiency. Suppose I have a 50Ohm SAW
filter that is terminated with a 50 Ohms impedanc

RF, Microwave, Antennas and Optics :: 18.06.2004 02:56 :: CTT :: Replies: **1** :: Views: **591**

This post is about **impedance** matching of Rf power transistor, these power transistor usually have low input/output **impedance** like z= 2.1 - j3.9,
The first question is that what is the usual practice for matching this low transistor **impedance** to standard 50 ohm, Is single stub matching is the only preferred choice for complex to real (...)

RF, Microwave, Antennas and Optics :: 19.10.2009 03:57 :: zubair :: Replies: **1** :: Views: **2976**

Zx should be 50 ohms. This is the reason using of the **impedance** **transformation** Network.

RF, Microwave, Antennas and Optics :: 27.01.2010 04:56 :: vfone :: Replies: **3** :: Views: **984**

In fact this is not balun configuration, because pin 2 of SA612 is AC connected to the ground (reactance of 100nF looks almost as a short at RF frequency).
This is a capacitive tap **impedance** matching, which is using the formula as in the attached picture (this is valid only if Rs <
If

RF, Microwave, Antennas and Optics :: 22.12.2010 12:53 :: vfone :: Replies: **4** :: Views: **1842**

Dear All,,,
I have a question regarding the basics of transmission lines...
If there is an RF source with rms voltage of (Vg) and an internal resistance (Rs) connected to a quarter wave transmission line terminated by an open circuit.
Now since the RF source would see a short circuit at its terminals because of the **impedance** **transformation** o

RF, Microwave, Antennas and Optics :: 04.07.2011 04:19 :: abees81 :: Replies: **1** :: Views: **586**

Hello I consider the attached image which is the first stages of a regenerative QRP receiver.
The amplifier comes from another project and output impedange is 50 ohm. The detector assumes an imput **impedance** of 50 ohm I think as well.
Since I would like to combine these circuits, I would like to migrate the output transformer of the rf amplifier w

RF, Microwave, Antennas and Optics :: 07.09.2011 04:41 :: neazoi :: Replies: **7** :: Views: **628**

Hello,
I have recently designed the PCB for a prototype UHF Receiver. The receiver operates from 450 - 458MHz. Anyway I requested 1 board from the PCB manufacturer and they asked me if I wanted **impedance** control. I have already designed for an **impedance** of 50 ohms. At these frequencies can I expect much variation in the **impedance** of my (...)

RF, Microwave, Antennas and Optics :: 12.11.2011 01:10 :: darcyrandall2004 :: Replies: **7** :: Views: **667**

It is the delay, that causes **impedance** **transformation**. Use any cable **impedance** as long as its length is correct relative its velocity factor, which can differ between different types of coaxial cables.

RF, Microwave, Antennas and Optics :: 15.02.2012 19:11 :: E Kafeman :: Replies: **21** :: Views: **1331**

Yes, there can be different **impedance** (or return loss) at antenna connector and the other side of the feeding transmission line. This is the reason that have to keep tracking the **impedance**s all over the transmission path.
Usually the RFIC manufacturers provides the **impedance** (S parameters) at particular pins of the IC package, and not behind (...)

RF, Microwave, Antennas and Optics :: 22.05.2012 09:33 :: vfone :: Replies: **6** :: Views: **289**

So even if the matching network is lossless how can i say that no power is lost in the **impedance** **transformation** network as soon as a portion of it will be reflected back?
The idea is that reflected signals cancel. Or in other words, the load **impedance** Zl should be transformed by the quarted wavelength line,

RF, Microwave, Antennas and Optics :: 22.06.2012 02:47 :: volker_muehlhaus :: Replies: **2** :: Views: **350**

I need information on toroids for 1-40MHz applications mainly related to **impedance** **transformation**. Where can I find the information on general toroids, windings, ... etc
madhukar

Hobby Circuits and Small Projects Problems :: 14.06.2003 01:53 :: brmadhukar :: Replies: **0** :: Views: **1038**

Hi,
balun basically for **impedance** **transformation**, matching so max power can be transferred. and depending on whether it can be practical. E.g. if requirement too wideband then balun not needed. If freq too low and not enough space, then other techniques are applied.
Cheers,
Element7k
Hi
I am so confused about balun. Som

RF, Microwave, Antennas and Optics :: 18.12.2003 06:10 :: Element7k :: Replies: **5** :: Views: **1432**

There are lots of companies that have surface mount PCB transformer. You can choose the **impedance** **transformation** ratio and the operating band.

RF, Microwave, Antennas and Optics :: 31.12.2004 00:09 :: lakeoffire :: Replies: **5** :: Views: **1159**

There are all sorts of passive networks that can change one **impedance** into another. The audio transformer is one example. Pi and T LC networks can also change the phase angle.
Matching is a special case of **impedance** **transformation** where the new **impedance** is what you want. That is, you design the network to get the (...)

Analog Circuit Design :: 24.02.2005 19:03 :: flatulent :: Replies: **13** :: Views: **1078**

It is also the very simplest divider.
It has large bandwidth if compared to other kinds (gysel or rat race),
and the bandwidth can also be broaded inserting more
λ/4 sections.
In fact just one λ/4 section could make the **impedance** **transformation**,
but if the "jump" is big (e.g. in a 10 ports divider/combiner you have to realize
an i

Electronic Elementary Questions :: 24.07.2005 04:02 :: TomAss :: Replies: **3** :: Views: **2071**

Hi to all,
I am presently engaged in design of folded P.A.T.C.H antenna using IE3D. I am constantly referring to the help manual... I feel its well written ,but I did not find any way to enter the feed point **impedance** of hte antenna .. I guess IE3D assumes it to be 50 ohms, but I am interested in design of slightly higher **impedance** (say

RF, Microwave, Antennas and Optics :: 01.02.2006 05:48 :: sbhalerao :: Replies: **2** :: Views: **779**

Hi
Iam having problems with differential Lna simulation in spectre. I have designed a matching network that would step down the **impedance** to a low level . After that i have used an ideal balun from the rf lib and tried to simulate it. I also tried with a VCVS.Neither of these seem to work. My S21 is a straight line .
BTW the **impedance** tran

RF, Microwave, Antennas and Optics :: 03.02.2006 23:06 :: sriniv1422 :: Replies: **0** :: Views: **759**

Hi,
I feed to feed a Patch Antenna (Edge Fed with MStrip Line) where the Input **impedance** at the edge of my antenna varies from rapidly over my band of interest. Note: I have resonance at the centre freq but below and above that its comples **impedance**.
Any suggestion on what kind of matching/**transformation** circuit (MStrip) can be used to (...)

RF, Microwave, Antennas and Optics :: 12.09.2006 01:03 :: Soyuz :: Replies: **1** :: Views: **766**

Hi,
there are three thechniques to design a broadband matching network
analytical
real frequency
**transformation** Q
They are far complicated to explain them in the forum like this, please refer to the literature:
George L. Matthaei, Leo Young, E. M. T. Jones ?
Microwave Filters, **impedance** Matching and Coupling Structures, Artech House,

RF, Microwave, Antennas and Optics :: 11.10.2006 06:22 :: flyhigh :: Replies: **2** :: Views: **1639**

In CMOS PA design one trick that could be done is to use multistage output L networks, to decrease the insertion loss and improving indirectly the efficiency.
Multistage L match may have lower insertion loss if the reactive component or components have low Q, even though the **impedance** **transformation** ratio is not high. The loaded Q of each stage s

RF, Microwave, Antennas and Optics :: 29.05.2007 05:33 :: vfone :: Replies: **15** :: Views: **1146**

RF, Microwave, Antennas and Optics :: 01.08.2007 02:45 :: balaguru thavamani :: Replies: **3** :: Views: **999**

Hi everybody
I need to transform a negative resistance of -5980 Ohms into a smaller value as it has to be generate by a transistor (Mesfet) by using a characteristic **impedance** of 90 Ohms for example. I'm using a quarter wave transformer with the equation:
Zin=Zo^2/Rl. I'm getting only an imaginary part but my supervisor told me I should only obt

RF, Microwave, Antennas and Optics :: 10.08.2007 09:21 :: hussard11 :: Replies: **4** :: Views: **647**

try using a **impedance** **transformation** circuit(i.e. L-match Π-match etc) to transform the 22 ohm to 2.2k.....

Analog Circuit Design :: 13.09.2007 09:32 :: A.Anand Srinivasan :: Replies: **1** :: Views: **451**

You have to give more details:
- what is the output **impedance** of the generator? 50 ohm?
- what is the input **impedance** of the matching box? 50 ohm?

RF, Microwave, Antennas and Optics :: 01.10.2007 17:13 :: VSWR :: Replies: **8** :: Views: **2138**

i tel u y , coz in ur schematic , u used both terminations are 50 ohms
u need to change term 2 to the **impedance** of the load , and things will work
khouly

RF, Microwave, Antennas and Optics :: 25.12.2007 04:15 :: khouly :: Replies: **6** :: Views: **701**

Why does the **impedance** at the patch input is purely real ?
As we all know the patch antenna input **impedance** stems from the **transformation** of the same **impedance** from one end of the patch to the other.
As balanis says the imaginary part of the addmitance in one side cancels with the imaginary part of the other side when (...)

RF, Microwave, Antennas and Optics :: 03.01.2008 03:37 :: bya036 :: Replies: **0** :: Views: **723**

Why does the **impedance** at the patch input is purely real ?
As we all know the patch antenna input **impedance** stems from the **transformation** of the same **impedance** from one end of the patch to the other.
As balanis says the imaginary part of the addmitance in one side cancels with the imaginary part of the other side when (...)

Electromagnetic Design and Simulation :: 08.01.2008 13:32 :: bya036 :: Replies: **0** :: Views: **614**

The DC feed is basically used to feed with DC the balanced inputs (or outputs) and should have minimal effect on the balun performance. Of course, those feeds/teeminals can play a vital role if they are used in the **impedance** **transformation**, but 50:50 Ohm conversion will actually require AC gnd for those nodes...
--padpan

RF, Microwave, Antennas and Optics :: 21.04.2009 07:56 :: padpan :: Replies: **6** :: Views: **2244**

@FvM ... what diff amplifiers do you use and where do you get them?
@eecs4ever ... datasheet of you ADC usually suggest a wideband transformer, if not, choose one from Mini Circuits. Watch out for the correct **impedance** **transformation** and termination.

Analog Circuit Design :: 08.09.2008 13:51 :: rfmw :: Replies: **4** :: Views: **1225**

Balun or **impedance** transformer??

RF, Microwave, Antennas and Optics :: 24.10.2008 06:23 :: zirtapoz :: Replies: **5** :: Views: **1508**

Hi,
What will be the effect on RF performance if i use wider track width than the actual calculated one?
For e.g. if at 2.45GHz, for 50 ohm **impedance** microstrip width is coming as 0.36mm for a particular PCB layer stack but i am using 0.5mm width for RF signals, what will be the impact on RF performance?
Cheers,

RF, Microwave, Antennas and Optics :: 07.03.2009 07:46 :: vibhatomar :: Replies: **3** :: Views: **1052**

Hey,
I have to design a power amplifier in 130 nm technology witht he following specs
Power Output: > 23dBm (at PA output)
Total Power Consumption: < 0.5W @ 16dBm CW output power
RF Input Signal @ 2.45GHz : 1Vp-p sinusoid if single ended
-- differential or single ended 1.414Vp-p if differential
Input Source **impedance** 50

RF, Microwave, Antennas and Optics :: 09.04.2009 15:14 :: mehul87 :: Replies: **0** :: Views: **604**

I have simulated a coaxial balun which will transform 50ohm unbalanced **impedance** to 25ohm balanced **impedance** as the following
The following picture is the simulation result, I get 100ohm **impedance** of port2 and port3.
[url

RF, Microwave, Antennas and Optics :: 26.06.2009 06:10 :: fxhfzy :: Replies: **5** :: Views: **1252**

I'm not quite sure but I think that two twisted pairs would be winded on the core. You use twisted pairs to get a transmission line transformer for higher frequency operation. This is equivalent to reducing the parasitic capacitance. I assume the unconnected winding is one of both threads of the primary that is not used because a 4:1 **impedance** tran

RF, Microwave, Antennas and Optics :: 30.06.2009 11:58 :: radiohead :: Replies: **4** :: Views: **972**

Hi,
I design a two stage UHF amplifier, 2Watts.
I have a problem two achieve a wideband interstage matchig.
The optimum output **impedance** of the first stage is R=U^2/2P => R=100 ohm
while the optimum input **impedance** of the second stage is only 4 ohm. With such a large **impedance** ratio it is very difficult to achieve wideband matching.
I (...)

RF, Microwave, Antennas and Optics :: 24.07.2009 05:37 :: maniana :: Replies: **4** :: Views: **1073**

Both parallel capacitor pairs have to be tuned while the series capacitors are setting the **impedance** **transformation** ratio. 68 pF surely isn't correct, it's 2 x 68 pF each in the NXP application note.
In my opinion, a 50 mm coil should rather have 4 than 2 turns, and it's not suited for distances above 50 or maximal 70 mm anyway, even if perfectl

Professional Hardware and Electronics Design :: 30.07.2009 08:56 :: FvM :: Replies: **5** :: Views: **4026**

I am confused by this post.
The reactive power splitters I have used have S21 = S31. And they work fine as power combiners too.
Working as a splitter, a 50 ohm source comes up to a T junction. At that T junction, looking one way, it sees 100 ohms resistive. Looking the other way it sees 100 ohms resistive. When the two paths are combined a

RF, Microwave, Antennas and Optics :: 23.09.2009 22:19 :: biff44 :: Replies: **8** :: Views: **1110**

I agree, that a LC series or parallel filter at an **impedance** level of e.g. 50 ohm involves unhandy L and C values. Usually bandfilters are build as a parallel circuit with high characteristic **impedance** (kohm range) and **impedance** **transformation** to the signal path.

Analog Circuit Design :: 19.10.2009 11:50 :: FvM :: Replies: **3** :: Views: **1862**

This is the all idea of tapped line, to provide an **impedance** **transformation**.
So you have to tune the filter design (length, spacing, width, etc, of the resonators) in the way that at the tapped point the **impedance** is nearly 50 ohms, meeting in the same time all the other parameters of the filter, insertion loss, rejection, bandwidth, (...)

RF, Microwave, Antennas and Optics :: 30.10.2009 10:41 :: vfone :: Replies: **8** :: Views: **2387**

I checked, that the site is working. Here's the direct tool's link:
But the tool is for inductance calculation only, not for design of resonant circuits or filters. I guess, you intend a matching circuit like the below Philips/NXP application? Viewn from the coil, the parallel and series c

RF, Microwave, Antennas and Optics :: 31.10.2009 05:39 :: FvM :: Replies: **6** :: Views: **3752**

Hi, all,
Let's consider a 50 ohm to 200 ohm **impedance** **transformation** SAW filter, and it has the insertion loss of 1dB. If it is inserted between a 50 ohm antenna and a 200 ohm LNA, will it help with the chain noise figure, or the noise figure of SAW+LNA will be better than LNA alone (refer to 50 ohm)?
Please let me know your calculation, if y

RF, Microwave, Antennas and Optics :: 06.11.2009 03:19 :: Ruritania :: Replies: **7** :: Views: **724**

Why don't you make a s-paameters simulation instead of AC to get the reflection coefficient and then **impedance**s ??
If you know the reflection compare to characteristic **impedance**, after that you can get the real **impedance**.

RF, Microwave, Antennas and Optics :: 13.12.2009 18:23 :: BigBoss :: Replies: **5** :: Views: **2094**

generating the current required for the effective reception of the signals
I guess you are talking about driving the reader coil? It can be expected as an inductive **impedance**, and surely not a "resistive load
of 19 0hm" as annotated in the circuit diagram. But the circuit also misses any means for RF modulation. It would be better

RF, Microwave, Antennas and Optics :: 23.04.2010 06:43 :: FvM :: Replies: **3** :: Views: **535**

the linecalc only calculate the width of feed line at one operating frequency,doesnt it?
The change in the line **impedance** over frequency is very small.

RF, Microwave, Antennas and Optics :: 10.11.2010 09:47 :: volker_muehlhaus :: Replies: **8** :: Views: **974**

In general, the bandwidth is reduced by increased **impedance** ratios and increased with more LC elements in the network.

RF, Microwave, Antennas and Optics :: 19.11.2010 11:46 :: flatulent :: Replies: **5** :: Views: **697**

In my opinion, the function of the "red" quarter wave transformer is **impedance** **transformation**. C is required to block the DC.
If the Z0 of the "red" line is above the reference **impedance**, and less then quarter wave length, the combination of "black" and "red"+C sections may be part of a 2nd order band pass filter (with good return loss). (...)

RF, Microwave, Antennas and Optics :: 14.02.2011 08:59 :: WimRFP :: Replies: **1** :: Views: **408**

It goes like this:
C251, C251 are DC block
L251 is used to compensate some internal cap, to have a real differential **impedance**
C252, L252, C262, L261 is the real balun; it gives a 90 deg phase shift on each branch (with opposite sign) plus a certain **impedance** **transformation**.
C253, C254, C255 probably a match to 50 Ohm plus some filtering (...)

RF, Microwave, Antennas and Optics :: 17.04.2011 23:37 :: Mazz :: Replies: **5** :: Views: **383**

want to know the **transformation** ratio of this input balun,if the input **impedance** is 50Ohm,so I want to know the out **impedance** through this balun?

RF, Microwave, Antennas and Optics :: 15.05.2011 08:48 :: swild :: Replies: **5** :: Views: **839**

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