If I'm using shorts in a TRL calibration must they both have exactly the same offset delay? I'm using coaxial shorts, one male and one female, and currently...
Hi Lou, The reflects define where the TRL reference plane is. That is, if one coaxial short is longer than the other, the TRL algorithm will find a reference...
Hi all, I am carrying out simulations on microstrip based interdigital capacitor(IDC). Now i am interested in extracting the capacitance of the IDC using the...
Dear Indrajit, The most straightforward of doing this is to use a circuit simulator. You set up the simulator to optimize your model (a capacitor) to a target...
The transmission line sections I intend to use for my Thru and Line standards in a multiline TRL calibration are terminated at each end with a probe pad....
I have a circuit fabricated in microstrip form which is connected to two feed lines of the same electrical length and the same nominal characteristic...
Dear Riaz, What you really want is a TRL calibration in transmission line 1 on port 1 and transmission line 2 on port 2. MultiCal supports this type of ...
Hi again- You are usually OK considering the lengths in FINDLEN and MultiCal as being relative lengths. There is a subtle advantage to adding in actual...
... port 1 ... That is correct. ... Does that make use of the Adapt on both, Adapt on 1, and Adapt on 2 features? ... I have Thru and Line standards in both...
Hi, I'm performing microwave measurements for ceramic BGA packages up to 50 GHz. On-wafer measurement system is calibrated using NIST-TRL technique. Because...
... My personal opinion about long transitions in measurement situations is that it is usually better to have a simple abrupt transition. The advantage is that...
Hello all- Here is a complete list of the measurements workshops at IMS this year that were sponsored by MTT-11. I think that it is a very nice lineup. If you...
Hi, Can anybody suggest me techniques to reduce reflection loss.I have a CPW signal line that makes a transition from 50 micron width to 200 micron width and...
I think you should use tapers to avoid abrupt transitions. It must reduce your reflexion losses. Unfortunately, I haven't seen the picture of the line because...
You have well understood what I said. I think that smaller is the angle of taper, smaller the reflection losses will be, but we will have a longer structure in...
Is it advisable to cover the feed lines to microwave circuits and also the TRL Thru and Line standards with a layer of dielectric material or should they be...
Dear Riaz, You seem to have identified two tradeoffs here. The first is that at moderate frequencies the effective dielectric constant will change less with...
A traditional on-wafer de-embedding technique exists that requires a VNA to be first calibrated at the probe tips and then three measurements taken. 1. Of the...
A pair of coupled transmission lines can be described by four 2x2 matrices each representing the self and mutual capacitance, inductance, resistance, and...
Hi, Can anyone please explain me the terms insertion phase and elctrical length of a line.I am working on TRL calibration and I have come across these terms...
Dear Sravanti, I am unaware of a place you can go to get formal definitions for insertion phase and electrical length. However, I think that authors who refer...
From all the posting I have read so far I have concluded that if I have a three-sampler VNA then I would have better results doing two tier calibration. From...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
