Recent content by yefj

I mean in general, we have transient field solvers . can i see the port impedance in the E/H of a transient field monitors. I have a differential transmission line with port characterstic impedance of 100Ohm. When I put field monitors on the line. The values if the E and H are real. Can I see...

Hello ,I have a basic dipole antenna with 70 ohm port. I put time domain H-field and E-field monitors. does dividing the real values E/H on a cutting plane will give me 70 ohms traveling as the time goes by? if the 70 ohm takes 1ns to travel from excitation to the ends what does it mean? Thanks.

Hello , I have simulated a basic two situations. The first is straight differential line. The second is curved differential line. The excutation is differential + - on the lines so the S2p is differento modes. in the curved pair line we have a situation where one line is longer then the other...

Hello , I have a PCB when I am doing NEXT tests of victim agressor on two differential lines. The opposite end of the lines is terminated. I am measuring sdd21 values around -40dB. Very often I have problem with the cables. suppose I have S11 S22 S33 S44 at -10dB which is good can I be...

Its end launch 1.85 connector. I have wera 851/9C 1 PHO which is Ncm, 8in-lb is 11Ncm.If i put 11 its too hard on the connector I feel. Is there a way In the VNA to see if the connector is propely connected?

Hello Balun core ,i cant find nowhere the torque needed to connect the cable to the connector and what toque to use . can you give some reccomendations on the subject? Thanks.

Hello,I have a PNA which works till 120GHz I use a 1mm to 1.85mm adapter to measure till 67GHz 1.85 SMA. I need to measure a differential lines. At first i got low causality about 50% so i played with the connector screwed unscrewed tried wipe of some spots i saw on the ground pad. Then i saw...

Hello Baluncore, I was told that there are two kinds of differential lines. Neck Down and Loosly Coupled. The difference between them is that Neck down has attenuated SDD21,correct? I tried to recreate this effect its not working. How can I design the ND and LC lines to the the difference in...

Hello , I tried to build a differential line and controll the SDD21 as shown in the photo. SDD21=S21-S41 i tried to increase the absolute s41 but the sdd21 is the difference between two complex and as you can see in the photo. i cant get the sdd21 smaller. Where did i go wrong? Thanks.

Hello,is there a way to model crosstalk using ADs transmission line models shown below? Thanks.

Hello , I have built a script by the method described in the article. it has dut with two fixtures on both side. I have fixture-X_length-fixture and fixture-2X_length-fixture what is the best strategy to extract the sparams of the dut. the optical article is good and it uses only one s2p...

Hello Baluncore,I have am trying to visualise this situation using a simpler case in another article shown below. As you can see in the photo taken from the article the Vb and VF pulses are a result of odd mode and even mode being not in the same velocity . why exactly the pulse shape is because...

Hello Baluncore, this is very intresting ,regarding the NEXT. When we have sudden rise in voltage it couples as sudden rise of voltage on the victim because parasitic capacitance I=CdV/dt and has to keep the same amout of voltage on both ends. Two question: 1.the coupling agression creates...

Hello , I saw this very intresting article atatched regarding cross talk in miander lines. Why in differential lines Fext is acting by pulses but NEXT is by steps. Is there a good alternative explanation to what the article says? Thanks.

Hello Baluncore, could you please draw in general the differential line structure you mean so I could try to simulate this principle ? Thanks. "If the track ran across a PCB past many other signals, then you might identify where the crosstalk was coupled from"