Recent content by yefj

Hello baluncore,few questions: 1.What is the math for 0.5V , with ρ = 0, at Zo. 2.The velocity factor is set to 1, marker 3 is at 4.86ns so the length is 0.7m. but its the wrong result becuase the length of the cable of port 1 is 0.3m(approximatly) How do I find the velocity factor of the...

Hello, there are many fixture removing methods . I got this keysight support answer for my N5224B PNA. I know there is 2X method, 1x Reflect Method. What method did he meant in his explanation? Thanks. ********************** Please follow the following link to our help files Manual...

Hello Baluncore,few questions: 1.why making pulse rise time shorter make tdr better? 2.I have transformed into time domain step responce.Is it more logical now given that port 1 cable has nothing connected to it? 3.I have shown in the photos below the Y-axes settings and how the markers look at...

hello balun core_I have attached the tdr in linear scale few questions: 1.what is meaning of the y axes? for example marker 2 of the photo we have is 4.22ns and yaxes 567mu what is "mu"? 2. I saw in other manuals the keiser coeffient shownin the photos.What theoretically is the best way to get...

Hello , lets take a simpler case, I have an open on the end of the cable so reflection is -1. so the reflected signal cacels the original one after a round trip. T(2*L/V) I expect the see a TDR ash shoqwn below. but in reality ash you can see in the TDR I got its totally different. also I...

Hello, my pna port1 is connected to a resonator. the resonator is connected to pna threw a good line 30cm long. I made S11 of 10Mhz to 40Ghz and converted to time domain(probably pna doing ifft) as you can see in the photos. the time resopnce is very bad. There is a menu I have to the time...

Hello baluncore , from reading at the following link resonance is a situation when we have standing waves. is this what happens here? the reflected wave cancels the incoming wave at port 2 so why its a standing wave situation? Thanks...

The basic definition of resonance is "energy trapped within a cavity and it going from electric to magnetic type" So whenrgy is trapped in a covity and doesnt go back thats why I understand we have a DIP in S11 of one port resonator. but how can we understand the dip of S21 using same "trapped...

Hello , I see things from Electro magnetic point of view thats why I said that energy is traped and goes from electric to magnetic withing the stucture. I am use to see resosnace as a dip in S11 why in the phot the say that resonance in a dip in S21? Thanks.

Hello , Yes I understand that its on a very narrow BW. In CST EM simulator I have found two ways to convert S-parameters as shown below in the photos. which method of the two presented do you think I should use to match what the book written as equivalent L and C of the VIA?

Hello , In this page from they book they say that we can extract capacitance and inductance from EM simulator. I have CST simulator I can build a two port PCB and make simulation and extract S-params from the simulation. How do I convert the capacitance and inductance from the S-params they talk...

I am trying to simulate time domain reflectometry and recognise threw the pulse responce if the load is capacitative or inductive. As you can see its not working . Where did I go wrong with the concept. what is the proper way to see threw the time responce if the load is capacitative or inductive?

Yes sorry for the mistake. Sorry for the stupid question but I know that I can get reflection coeffient threw the TDR by the formula below . but how can I know that out ZL is inductive or capacitative? Zc=1/jwc ZL=jwl these formulas dont help me understand this in the wiki link you posted.

Hello,can you give me some manual regarding how to mathemtickally we prove that the reflection is capacitative or iductive?

Hello , Yes I know what TDR is I need to know how to interpret its capacitance inductance. parts. how do i do that? can I see VIA structure properties threw the peaks of the TDT and TDR?