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Hello,
I would like to generate a time variant capcitor (C(t)) and inductor ((L(t)) in LTspice, however I do not know how.
I could not find any step-by-step manual for this issue.
Thanks
Hello,
Does axial ratio is sufficient to determine on whether an antenna is circulary polarized?
If you consider two orthogonal E field (say x and y with the same amplitude) componnents without 90 degress phase shift, the axial ratio would still be 1. If so, why does people state that axial...
Hello there,
I have yet to design a differential pair TL, so I came up with this fundamental question:
Say you design a single ended TL that is connected at its both ends to coax cables which are connected to a calibrated vna. To avoid reflections, the characteristic impedance of the TL should...
Gain is not the electric field in dB.
I suggest you look at Balanis or other textbook for Directivity which is the radiation intensity at a specific direction divided by the averaged radiation intensity.
Then you can understand the term 'antenna gain' which is very similar to the Directivity.
I know that in other simulators they have something like 'continuous angle', which shows you the total phase accumulation. Ovbiously from standard S21 measurments you cannot tell the entire phase accumulation, as it is typically wrapped between -pi to +pi.
Actually I did say what is what. The green is some type of ROGERS and the yellow is prepreg.
The application could be a dielectric radome for an antenna. In the design of such a radome I do not need traces, pads, vias or anything like that.
Each ROGERS layer (green) is obtained by removing all...
Hi all,
My question regards to PCB manufacturing process.
Say I have two PCB cores (some type of ROGERS) that were etched, i.e. there is no top/bottom metal in each of them. I wish to connect them using PCB process using the appropriate prepreg (bonding).
Is it possible to do so ? note that...
Hey,
I am not a CST expert as I typically use HFSS. If you are interested in studying the infinite case then I do not have the right idea. However, I believe that you can simulate the behavior of a large but finite structure. Instead of just reflection and transmission coefficients, you would...
Hello,
I modeled a basic horizontal lambda0/2 dipole above a ground plane.
Initially, I simulated the dipole in free space, yielding a reasonable antenna gain of 1.64 (or ~2.14 dBi).
Next, I simulated it over an infinite ground plane. While the normalized radiation pattern stayed consistent...
Each mode has a different field distribution, which implies different impedance, group delay, etc.
The 'selection' between the propagating modes is usually done by proper design of the feeding network. For example, in a rectangular waveguide the relevant propagating modes can be obtained by...
First, note that J is a vector which raises the question, what direction is n? (J_n).
Let us assume a Z directed line source located at the origin. The Z directed magnetic vector potential is given on your second formula (you should have a single integral from -inf to +inf). You then change...
Hi, it seems like an ordinary matching process. Your lumped elements in HFSS have physical dimensions that are not considered in ADS. For such resonant structure I would expect that there will be some mismatch.
I would do the following steps:
1. Perform a frequency sweep - the resonance may...
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