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116 Threads found on edaboard.com: Vna Measure
I have an LDMOS amplifier. I am testing it using a power meter. When the second port of the power meter is connected to standard 50 ohm termination, everything goes well. However when I connect it to my load which shows 50 ohm on vna, the Gate to Source Voltage increases and there is an abrupt increase in output power. I am unable find out the rea
I don't understand the purpose of thís setup. S11 can be measured by a vna as single port measurement directly, using the internal directional coupler.
Hi, I am trying to find dielectric properties of liquids using a rectangular waveguide. I do not have access to vna but am having an oscilloscope and a microwave signal generator. I want to calculate S parameters of the waveguide. Can someone help me with a possibe circuit diagram and formulae ? Thanks
Impossible to measure with vna.
If you can make one pad/port of this inductance well short circuit on a test board, any vna will measure its inductance.
you cant connect RF pad directly to vna. you need to connect/solder a connector/cable eg. SMA or SMA/UFL cable soldered onto the pad.
Hi, from the following link : There is a polar diagram in vna(Vector Network Analyzer) We are able to know the PCB layout trace length by phase variation. My que
please help me , i want to measure active S parameter of a 2 port MIMO antenna. i know the equation to calculate active s parameter "Active SParameters is (S11*a1 + S12*a2)/a1 where a1 is the complex excitation in volts incident on Port 1 and a2 is the complex excitation in volts incident on Port 2." my network analyser transmitting 0 dbm
usually reference antenna will be used for TRP and TIS measurement in the chamber because the characteristic of reference antenna is known and the only unknown here is you DUT (antenna). TRP is a measure of how much power is radiated by an antenna when the antenna is connected to a transmitter. TRP measurement method can be used to (...)
Basically yes, I'm doing this quite often. The shunt impedance (RL or RC equivalent circuit) is usually already displayed in a single-port measurement. But the useful impedance range is restricted by the 50 ohm characteristic port impedance. A wider impedance range can be measured in a two-port setup. I suggest to learn a bit about S-parameters
how can i measure isolation between two antenna system (two diffrent band ) in vna
If you don't have too much experience doing vna differential measurements (and simulations), would be better to use a balun because you can choose the right impedance ratio of the balun, as in the list below from TDK: For using a simulator, TDK provides the S-pa
thanks for your input. i know how to calc them, but i want to use a vna to measure some small rf compnents, so i need a tool. :) maybe i can built a simple program to calc them.
A vna gives you serial or parallel equivalent R or X ( C or L ) values at certain frequency.When you divide X value ( 2xPIxF or 1/2xPIxF ) you'll get L or C values respectively. For instance, let say you have read 0.55+j*0.77 Ohm ( normalized ) impedance on your vna @ 2GHz.It's a serial R+j*XL impedance. Z=50*(0.55+j0.77)=27.5+j*38.5 @2GHz So R=27.
1. Buy it! --> 2. Use vna to measure and generate s2p file --> 3. Simulate in ADS
Either real circuit inductance or wrong reference plane (wrong vna calibation).
You can measure this impedance with a vna by using a bias Tee.. Then you will have enough information what order of RF impedance should be terminated.
Dear colleagues; I am working on wifi and bluetooth boards. And try to measure antenna isolation between antennas. I applied the proper coax cable to vector network analyzer (vna) and perform the calibration. Then connect the coax cables first to wlan antennas (2x2 system). Result is seen as below; 105911 Then remove on
Dear Sir, I am designing a transmitting patch antenna array consisting of four elements and one recieving patch antenna element on the other side. I am having vna and USRP. I am confused how to use these instruments to transmit a signal from array and then measure that signal's phase from recieving antenna element. If you can help me i would be ve
Hi, I have encountered a problem where I try to measure a RF Amp with a very low power input. But the vna keep showing an warning message "Phase Lock Lost". I cant measure anything when I see this message. Would like to know what is the problem? What lead to this problem?
Hi all I have to measure S parameters for a differential line.But I have a constraint that it is not possible to measure coupling factors,s12(ie b/w adjacent ports) because of the close proximity of ports.Can you suggest a way to calculate the differential S parameters from single ended lines considering the constraint that I can place two probes
Hi everyone, I would like to clarify a concept. For bandwidth of the interconnect related to rise time (10GHz Bandwidth, then rise time would be .35 ns) . If i would use the vna to measure the insertion loss of the interconnect, and -3db would be like 1GHz (that would be too low). This mean the rise time got change from .35ns to many more. Pleas
Use a calibrated vna, it outputs all you need.
A basic question! I have two Dipole antennas, which are identical and I conduct an experiment. I use vna to connect them to two ports and measure S21. How do I calculate the gain of using Friis transmission equation? Using , S21 = Path Loss + Gt + Gr Here Gt = Gr = G So G= (S21- Path Loss)/2 and knowing measured S21 and calculated (...)
And don't overdrive it with too high an RF level from vna, particularly at low reverse bias levels.
How can I measure the inductivity of an antenna operating at 2.45 GHz using a vna?
Modern 4-Ports vnas can handle to measure differential impedances.For instance, consider an differential amplifier,each input/ouput is connected to one port of the vnas inputs/ouputs using single ended cables and connectors.vna calculate differential s-parameters from mixed mode s-parameters. Wideband 1:1 or 1:4 transformers (...)
Hi all, I got zero bias shottky diode based power detector. It gives DC output upto -30 dBm power input. I want to measure input impedance of this circuit. I just connected the input of the circuit to vna port 1; it shows about -3 dB in magnitude plot. 1. Is the method I used to measure input impedance correct? if
A directional coupler and power meter+signal generator can help you but the accuracy will not be satisfying and you will not able to measure the phase of S11.. I think you should wait for your vna..
No..vna=Vector Network Analyzer(It's a Common Name) PNA is a model/series of Agilent vnas.Some models are capable to measure X-Parameters, some are not. For more information look at Agilent website.
hi! did someone knows how to measure multiple frequency sweeps with the vna. thank you
Hi! I want to measure the S21 of a device. i do not need the S11 and S22. should i make the whole TRM calibration, or it is enough to connect just the T (through) kit? Thank you!
A general way to measure vectorial signals is based on vectorial/quadrature demodulation. That's the method e.g. used in most vna. In can be either implemented as a homodyne demodulation with quadrature reference signals or as heterodyne demodulator with frequency offset.
Maybe I miss something, but why not measure with a vna? If you measure as a two port, with the third port terminated into 50 ohm, you can easily postprocess the S21 data sets and get the difference in S21 magnitude and S21 phase between the two paths.
If you vna has 3.5mm connectors, your calibration kit will obviously support your 8720D up to 9GHz. Because 3.5mm connector is a industry standard and it can be used with any vna brand.I think cal kit is not supported with recent models which have higher frequency of mesurements,that's why it's not been mentioned.
LO Return Loss is not a very significant measure.Because LO port is a "hard drivien" port and this LO signal will drive your mixer-either diode or transistor- to switch the commutating components and Retrun Loss has less importance.However, vna's have generally +13dBm output power but if yours doesn't, simply amplify it but you can not (...)
Use a vna to measure the input impedance and design a matching network. Or at that frequency you can rely on the fet device model from the manufacturer.
PLL Loop Filter nth degree low pass filter and it can be measured with vna or Signal Generator with Powermeter.
How should S-parameters be measured correctly for MOScaps on a vna? Since it's an nMOScap I need to bias the gate at 1V to create the channel in the device. When I did this the capacitance values still look like those measure with no bias. I use a DC power supply and a T to connect the DC voltage to the vna. I connect the (...)
What is the BW of the LNA anyway? Taking a shot at the definition, is it just the range of spectrum where the LNA can amplify a input signal? How would you measure the BW of a LNA with a vna? Taking a shot at the definition, is it just S21 log mag across the entire frequency range of the vna (30MHz to 20GHz)? Please advise.
Hello, Is the S parameter test set absolutely necessary to measure all the S parameters of the DUT or can I perform all the measurements with just the vna by itself and simply plugging and unplugging the cables where appropriate. FYI I have an Advantest R3762 vna with an R3961 S parameter test set. I imagine other (...)
Can a vna be calibrated to 25Ω for balun measurements? 25Ω coax cable 25Ω resistor Unfortunately 50Ω connectors thanks
How to do the measurement for FSS? (I want to measure S11 and S21) I have a sample of FSS and I want to measure reflection and transmission in Ka band. I heard that I can use two Ka band horn antennas with vna. However, I don't know much about the measurement ,for example, the distance between two horn (...)
Hello Sir how to measure OIP3 point of mixer practically and theoretically ? please give me practical setup also. vna , signal gerator and spectrum analyzer are available to me , how to use it to measure SNR ? Thank You
Practical matching do work, question is if it is working as intended. A easy check is to measure with vna when the stub is cut away, and if you then get same parameters as your simulation was based upon. Guess that these results will differ also. It is easier to succeed with making a matching network practically if it is based on practically done m
How will you measure DC Resistance with vna ???? vnas have lowest frequency limits that's why you can not meausre DC resistance of anything with vna.. Find a precise milliohmmeter and measure it...that's it..
Pout is relative low, why that big attenuator then? 20dB attenuation => 20 dB reduced dynamic range of vna. How much power can your vna handle? measure TX impedance requires that the chip can be set in CW mode, I assume? Measuring VSWR of antenna do not result in impedance values? What type of vna do you use? (...)
I use them both all the time. Lets say I have a small antenna that I want to measure the impedance of. I cal the vna normally (on my machine I just do an open/short "response" cal). But after this cal the reference plane is at some connector plane, not necessarily at the exact antenna feed point. I then take the antenna and solder on a short wi
Hello I am trying to calibrate a R&S vna for dielectric measurements. The configuration is the following: Coax cable (2.4mm m) --> 2.4mm f to 2.4mm f connector --> (2.4mm m) Open-ended coax probe I would like to calibrate up to the connector probe plane to which I will then connect the probe. My problem is that the calibration unit I have
Hi all, I raised a question on measuring the phase difference of two external RF signals using a Network analyzer (vna) The original question and related replies can be found here: I found a solution for my problem and I'm posting it here for the benefit of other users as I didn't find any thread