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I changed the central pin width to 0.38 mm to fit the transmission line, but this change does not affect a lot the matching.
I also think the transmission line should be a little bit bigger for solder.
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The same result when I change the central pin width to 0.51 mm, and I...
Hello,
I simulate the SMA model in HFSS (a PCB board which comprises of 2 SMA connectors and a transmission line) and it shows the mismatch problem.
The mismatch does not come from the transmission line nor coaxial transmission in SMA (I verified it) so I suppose it comes from the connection...
I asked ADS about this problem, and finally it comes from effectively the interpolation in ADS.
It needs to extend the S-parameter from 0 Hz to 8 GHz or more, so that the time simulation can work correctly.
It works with Marchand Balun but not with Rat Race Balun, even they have the same S parameters at 8 GHz. That why I dont understand.
The rat_race.s3p is also in my project with the marchand_balun.s3p
I misunderstood you. It is as you said, the sin wave in the limited period, so the spectrum extended to 6.4e10 Hz.
It explains the warning.
However, it does not explain the different outputs.
With the three ports, if |S21| = |S31|, I do not see why the output at port 2 |out2| is different to...
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It is the ideal sin waveform. When I replace the imported 3-ports S-parameter by the ideal balun, it has the same message but the two outputs are equal in amplitude.
So I think that the problem is only at the imported 3-ports S-parameter, but I don't know how to explain...
Hello,
I have a simulation in the ADS Transient where I have a 3 ports imported S-parameters.
The time domain source is the sin wave at 8 GHz and at this frequency the S21 and S31 are at the same level (only the phase shift of 180 degree).
But the voltages at two outputs ports are not at the...
Hello,
I am modeling a balun block in Simulink which have an imported S parameter.
I have a pulse signal in UWB at the input (in the array r1Ant) then in Simulink it passes a input port and S parameters block, then the output is r1_balun_1.
The spectrum of output signal in Simulink is quite...
Hello,
I have a question about CPS Balun design for array antenna.
My concern is that my array antenna have normally a common ground, for example a patch array antenna.
https://www.cst.com/Applications/Article/Microstrip-Patch-Array-Design
Then I would like to convert microstrip...
Hello,
I am looking for a discrete device for this function.
I would call it a mixer with large bandwidth DC-9 GHz but it does not exist.
I think about a RF switch, but it is complicate to inverse the input signal.
In a paper I read, it is called Code modulating LNA, where the Vdd can be...
Hello,
I am looking for a CM LNA, which is described in this paper:
https://pdfs.semanticscholar.org/bdda/862ff38de85544354baed2c254f705dc0bc7.pdf
It multiplies an analog signal at high frequency (6-10 GHz) to -1 or 1. I image that the supply voltage is not the DC, but we can change it at...
Mesure the difference of length by VNA, is it necessary to calibrate ?
I have a question concerning the necessity of calibration in my measurement by VNA.
In fact, the measurement time is very important in my setup, so I would like to ask if the calibration correction is necessary ?
Here is...
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