Search found 4 matches

by jjmaloss
Thu 18 Mar 2021, 22:16
Forum: Usage
Topic: How to use SetCustomExcite for a shifted signal?
Replies: 1
Views: 760

Re: How to use SetCustomExcite for a shifted signal?

Actually, the solution is pretty simple:

do '(if (abs(t-5σ)<σ),1,0)' for a rectangular pulse in [4σ,6σ]. This σ needs to be hard coded to a numerical value or use the unfriendly function num2string(). As a proof of concept, please find the code that generates 2 well separated rectangular pulses.
by jjmaloss
Wed 17 Mar 2021, 05:54
Forum: Usage
Topic: How to use SetCustomExcite for a shifted signal?
Replies: 1
Views: 760

How to use SetCustomExcite for a shifted signal?

Hi, I am trying to add shifted signals of type sin(ω(σ-|t|)) in [-σ,σ] and 0 elsewhere. I call this function Umin(t). I am using SetCustomExcite. The issue is that these pulses *are shifted* in time. For example, I would like to perform a simulation where I consider say Umin(t-σ) + Umin(t+3σ) (two i...
by jjmaloss
Thu 16 Apr 2020, 00:50
Forum: Usage
Topic: Convergence value
Replies: 3
Views: 4635

Re: Convergence value

My experience is that when simulation reaches a plateau around 35 dB, something is not right in the setting of the simulation. I become really doubtful when spurious oscillations occur. May be you should try to block the simulation at 1.e-3 and see if things are consistent, I may be wrong.
by jjmaloss
Wed 08 Apr 2020, 04:53
Forum: Usage
Topic: Negative impedance for an antenna at 1 GHz (and 50 Hz)
Replies: 0
Views: 4628

Negative impedance for an antenna at 1 GHz (and 50 Hz)

Hello. I am running a simulation where an antenna is made of an external wire and a coaxial wire. These two wires are connected through an active and passive lumped ports. Each port has a resistance of 50 ohms. The antenna is approximately 190 mm long. The frequency that I use is is 1 GHz. The passi...