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

When a load **impedance** connected at one end of a coaxial cable, the **impedance** seen by the source connected at other end may or may not be equal to load impedane. The **impedance** seen by source varies in a cyclic manner depending of length of coax cable, becoming equal to load **impedance** every 1/2 wavelength along coax. In (...)

RF, Microwave, Antennas and Optics :: 08-13-2015 19:46 :: abcd567 :: Replies: **0** :: Views: **8**

Hello guys,
I am currently making a design including a GSM module which has a 50 ohm **impedance** output for the antenna. However I am interested in using a dipole (73 Ohm img 43Ohm) antenna with this module.
I have been searching around for either a dedicated , or discrete balun that can handle this **transformation**, with no luck.
Does anybody h

RF, Microwave, Antennas and Optics :: 04-09-2015 10:10 :: podoljano :: Replies: **0** :: Views: **225**

...................
P.S my dipole is precisely 50 OHM and so is the coaxial cable so no need for **impedance** **transformation**. I only need to eliminate the coax shield currents.
How did you achieve that ? ... dipoles are 75 Ohms by nature ( folded ones 300 Ohms) ... what **impedance** matching did you do ?
Dave

RF, Microwave, Antennas and Optics :: 02-01-2015 05:02 :: davenn :: Replies: **9** :: Views: **638**

Because you mentioned "step up to 50 ohms", means the PA output **impedance** is lower, and usually this kind of transformers use 25 ohms coax cables.

RF, Microwave, Antennas and Optics :: 12-18-2014 10:41 :: vfone :: Replies: **7** :: Views: **665**

Could I use this kind of **impedance** transformer to do this?
Yes. In fact there are no alternatives to a transformer, preferably a transmission line transformer.

RF, Microwave, Antennas and Optics :: 10-21-2014 03:36 :: FvM :: Replies: **1** :: Views: **363**

i need to design a Coaxial **impedance** **transformation** which as a part of a complex antenna ,but i am not sure about the feed in feko. i use the waveports,then meshed it has wrong in the port.could anybody can give me some suggestion.plz

RF, Microwave, Antennas and Optics :: 10-10-2014 05:21 :: hausn :: Replies: **0** :: Views: **222**

i would not do it that way.
you show an elliptical lowpass filter. If you make use an open circuited stub to approximate the L-C shunt resonator, then you simply set the electrical length of the stub to be quarterwave where the L-C element resonated in frequency. You choose the **impedance** of the stub transmission line to approximate the reacta

RF, Microwave, Antennas and Optics :: 09-19-2014 14:46 :: biff44 :: Replies: **4** :: Views: **372**

By "hole" do you mean a via between your signal trace and ground? If yes, the main requirements are that the hole/pad diameter is less than lambda/4 of your design frequency. This hole condition is required for it to not radiate (losses) and the length of the via should be less than lambda/4 in order to avoid an **impedance** **transformation** at the shor

RF, Microwave, Antennas and Optics :: 08-25-2014 13:26 :: megaknaller :: Replies: **1** :: Views: **460**

hi,
i want to design an expeonential tapered microstrip line for **impedance** **transformation** from 50 to 100 ohms.now i caluclate w(width of M/S) using tline calcuator and w2=5w.now for exponent factor of m/s line i used a=1/L* ln(z0/ZL) but i dont know how to find exponent factor for ground???that is also tapered in such a way that its widt and M/S l

RF, Microwave, Antennas and Optics :: 05-23-2014 03:51 :: aniakhan :: Replies: **0** :: Views: **221**

So you want to **impedance** match a radio with antenna for maximum efficiency and have a transformer somewhere along the line. **impedance** matching can be done on either or both sides of transformer. It is only a question of what is the most practical alternative.
Assume components have been added resulting in conjugate match between antenna and transfo

RF, Microwave, Antennas and Optics :: 01-20-2014 21:11 :: E Kafeman :: Replies: **16** :: Views: **519**

See this thread about TI CC2520, a 2.4 GHz radio:
Is it a related type of problem?
According to that link should **impedance** matching at least for first harmonic be high **impedance** matched (reflective) as it affect TX efficiency. My practical tests with CC2520 shows that also. It can be a dif

RF, Microwave, Antennas and Optics :: 12-05-2013 04:24 :: E Kafeman :: Replies: **12** :: Views: **704**

Real or imaginary part of what? **impedance**?

RF, Microwave, Antennas and Optics :: 10-19-2013 23:22 :: mtwieg :: Replies: **2** :: Views: **282**

depends also on frequency -> substrate loss or coupling or changed **impedance** **transformation** if taken into account.

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 09-26-2013 05:13 :: johnjoe :: Replies: **4** :: Views: **492**

Your patch itself very likely doens't show a real **impedance**.
Your resonance is due to a combination of the wierd **impedance** of the patch at 4.55 GHz and the **impedance** **transformation** due to the quarter wave transformer. Of course at 4.55 GHz your quarter wave transformer no longer functions as a quarter wave transformer. (...)

RF, Microwave, Antennas and Optics :: 06-14-2013 17:18 :: WimRFP :: Replies: **4** :: Views: **742**

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 :: 05-12-2013 12:16 :: Darktrax :: Replies: **2** :: Views: **409**

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 :: 05-08-2013 11:24 :: Vineeth m p :: Replies: **0** :: Views: **484**

Hi! I`ll work with for very first time. I want to use it for current measurement through current transformer. I have current transformer with **impedance** of 50 omhs and **transformation** ratio 50A to 0.05A on the secondary coil. Can you give m

Analog Circuit Design :: 03-05-2013 04:56 :: stoyanoff :: Replies: **1** :: Views: **535**

Sure - you can use whatever lengths you like (provided the circuit parasitics don't swamp whatever effect you're trying to achieve with lengths of transmission line). There's nothing magical, prescribed or fixed about your choice of line lengths :)
ANY length of transmission line will perform an **impedance** **transformation** (provided the load impedanc

RF, Microwave, Antennas and Optics :: 02-11-2013 23:15 :: thylacine1975 :: Replies: **1** :: Views: **462**

All conductors are transmission lines. When they are very short compared to a wavelength or compared to a pulse rise time they can be accurately approximated as an ordinary connection without considering the reflections and **impedance** **transformation** effects.

RF, Microwave, Antennas and Optics :: 07-14-2012 12:28 :: flatulent :: Replies: **2** :: Views: **329**

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 :: 06-22-2012 02:47 :: volker_muehlhaus :: Replies: **2** :: Views: **517**

Hi,
I have a question about an output combiner design. I have designed a 4 ways output combiner which provides **transformation** of **impedance** (50 ohms) to a desired **impedance** for the transistors.
I have simulated very good output power level and the matching network is very low loss but when I perform a small signal simulation I am (...)

RF, Microwave, Antennas and Optics :: 04-26-2012 11:50 :: jayce3390 :: Replies: **2** :: Views: **413**

Tapped inductor circuit is really an autotransformer and as such has the proprieties of **impedance** **transformation**. This circuit can be used to increase the effective source or load **impedance** in order to improve the loaded Q of a circuit.
In other words, the Q of a LC circuit will decrease when we connect a transistor to it, this is because (...)

Analog Circuit Design :: 04-19-2012 18:12 :: mister_rf :: Replies: **2** :: Views: **501**

for crystal model ( C , L, Rs ) in series L = 3.5m H (offchip xtal component)
Rp (transform) = (wL)^2/Rs this is huge value for w =120M Hz, Rs=50 ohm--> Rp=1.4*10^11 ohm
so i need a circuit where the crystal should see w very large Z to prevent decreasing the Q heavily
or what ?
can any one help me in this

Analog Circuit Design :: 03-28-2012 19:21 :: ali kotb :: Replies: **0** :: Views: **426**

Power amps have a fairly high input line level (~1V?)
and an **impedance** that is mismatched to sources like
mics and guitar pickup coils.
Preamps may perform not only gain, but **impedance**
**transformation** as well; they may include shaping of
frequency response (like a RIAA phono preamp).
The noise qualities may receive more attention (...)

Analog Circuit Design :: 06-08-2011 15:29 :: dick_freebird :: Replies: **2** :: Views: **656**

Hi,
I am confused about the format of input and output **impedance** of RF transistors. For some devices **impedance** are given in series form and in parallel form for other devices. Some data sheets do not mention. Why series to parallel or parallel to series **transformation** is required.
I am using pd85004 ldmos for amplifier. When its model (...)

RF, Microwave, Antennas and Optics :: 06-05-2011 09:16 :: adnan012 :: Replies: **5** :: Views: **1145**

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 :: 05-15-2011 08:48 :: swild :: Replies: **5** :: Views: **978**

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 :: 04-17-2011 23:37 :: Mazz :: Replies: **5** :: Views: **549**

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 :: 02-14-2011 08:59 :: WimRFP :: Replies: **1** :: Views: **507**

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 :: 12-22-2010 12:53 :: vfone :: Replies: **4** :: Views: **2272**

Hi maria,
you can transform pi into tee by **impedance**/admittance **transformation**.
Regards
Z

RF, Microwave, Antennas and Optics :: 12-15-2010 20:51 :: zorro :: Replies: **4** :: Views: **439**

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

RF, Microwave, Antennas and Optics :: 11-19-2010 11:46 :: flatulent :: Replies: **5** :: Views: **854**

what will be the impact on RF performance?
It all depends on the length of the line relative to the wavelength.
If the line is 1/20 wavelength or shorter (effective wavelength including substrate epsilon), then the **impedance** **transformation** due to the wrong Z0 can be neglected. If your line is longer than that, you

RF, Microwave, Antennas and Optics :: 08-24-2010 14:05 :: volker_muehlhaus :: Replies: **3** :: Views: **1191**

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

RF, Microwave, Antennas and Optics :: 01-27-2010 04:56 :: vfone :: Replies: **3** :: Views: **1122**

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 :: 11-06-2009 03:19 :: Ruritania :: Replies: **7** :: Views: **908**

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 :: 10-30-2009 10:41 :: vfone :: Replies: **8** :: Views: **2780**

Hi
Your **impedance** network "takes" care of the **transformation** of the voltage and currents. The way we insert the voltage at either drain/collector through fx. inductor. The voltage swing at the drain is larger than your supply voltage: Vcc+Vd. This can happen because of your LC network on the output, which transforms the voltage and currents.

RF, Microwave, Antennas and Optics :: 09-19-2009 09:05 :: tyassin :: Replies: **7** :: Views: **991**

Change port 2 and 3 to 25 ohm differentially. Or use configurations for **impedance** **transformation**.

RF, Microwave, Antennas and Optics :: 06-27-2009 18:35 :: radiohead :: Replies: **5** :: Views: **1572**

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 :: 04-21-2009 07:56 :: padpan :: Replies: **6** :: Views: **2710**

@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 :: 09-08-2008 13:51 :: rfmw :: Replies: **4** :: Views: **1515**

Hi,
I have the following broadband power amplifier 400M-1G that I need to reverse-engineer sort of and having problems calculating the **impedance** match.
I do understand that the coaxial cable transformers (Zo=10ohms) sort out the basic **transformation** ratio but still the transistor (LB401) has got capacitive input and inductive output. That is wher

RF, Microwave, Antennas and Optics :: 02-03-2008 12:08 :: joensd :: Replies: **8** :: Views: **1001**

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 :: 01-08-2008 13:32 :: bya036 :: Replies: **0** :: Views: **841**

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 :: 01-03-2008 03:37 :: bya036 :: Replies: **0** :: Views: **899**

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 :: 12-25-2007 04:15 :: khouly :: Replies: **6** :: Views: **829**

My circuit has an output **impedance** of 2.2KOhms and its output is fine.
But when i connect this output to the input of another circuitry (whose input resistance is 22 Ohms) the signal gets attenuated.
I have designed a buffer using a BJT. still the negative portion of the output gets clipped. plus the transistor heats up after a while.
I als

Analog Circuit Design :: 09-13-2007 03:22 :: 4a9s1w6 :: Replies: **1** :: Views: **573**

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 :: 05-29-2007 05:33 :: vfone :: Replies: **15** :: Views: **1265**

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 :: 10-11-2006 06:22 :: flyhigh :: Replies: **2** :: Views: **2042**

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 :: 09-12-2006 01:03 :: Soyuz :: Replies: **1** :: Views: **906**

As said above transformer is not an amplifier. But the propertie of voltage **transformation** can be used as step-up booster where secondary voltage is higher than primary voltage. Secondary load **impedance** must be higher than prinary one or it should be highohmic.

Elementary Electronic Questions :: 03-08-2006 10:45 :: Borber :: Replies: **7** :: Views: **628**

Dear all,
I have a 2-wire dual mode speaker with the differential impeance 32 ohm, and it will driving by a audio amplifier with the output differential **impedance** 8 ohm. My question is that how can i do matching between them to maximize the efficiency.
Thx a lot,
Best rgds.

Professional Hardware and Electronics Design :: 07-19-2005 03:14 :: Mac7978 :: Replies: **1** :: Views: **1247**

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

Elementary Electronic Questions :: 07-24-2005 04:02 :: TomAss :: Replies: **3** :: Views: **2403**

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