# Questions tagged [lumped]

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### From the perspective of a progressive wave, what is lumped impedance? [closed]

This question asks about the meaning of lumped impedance in traveling wave theory. Should lumped impedance be viewed as something like a point charge, a point mass, or a direct delta function? When a ...
455 views

### How can I deal with the traveling waves associated with lumped impedance? [closed]

The answer I want to get is how to find the reflection coefficient. I wanted to know how to find the reflection coefficient and so this is a different question as the question was written to get that. ...
177 views

### Finding the reflection coefficient for a wave incident from the left into the first transmission line?

I am having a hard time dealing with lumped impedance in problems related to traveling waves. How can I handle problems where both characteristic impedance and lumped impedance are present, as in the ...
1k views

### Unphysical voltage in SPICE simulation

I was exploring a lumped approximation of a distributed RC network (sort of a lossy RC transmission line/ladder network). Everything made complete sense until I observed the voltage "gain", ...
254 views

### How do I implement lumped circuit elements in ANSYS HFSS v15.0?

I am simulating a PCB antenna using ANSYS HFSS v15.0. Before the signal is fed into the antenna, there is a smoothing capacitor and an LC T-section matching network to match the impedance of the 50 Ω ...
• 101
165 views

### Defining lumped and distributed elements according to signal travel time

We define distributed elements as circuit elements where the physical dimensions of the elements cannot be ignored and the differential equations stating the current, voltage etc also contain a ...
1 vote
955 views

### Lumped Element Equivalent Circuit for Microstrip line

I am breaking my head already for 2 days on this problem I have. I want to represent my microstrip line in lumped components. My microstrip line has the following characterstics:  Z_0 = 50 \text{ [\$\...
369 views

### How can I replace lumped capacitor and inductor with microstrip line?

This is a spst switch working on 2.4 GHz. I want to replace the inductor and capacitors with microstrip line. What is the easy way to do that?
1 vote
535 views

### Transmission line model VS lumped parameters models

Both the lumped parameters models vs transmission line models use RLC components for modelling. This is where I am confused and cannot see the difference between the two.
• 459
1 vote
48 views

### Different 50Ohm-matched condition for different length of metamaterial waveguide

Based on coplanar waveguide, I am designing a meta-material waveguide by inserting lumped-element inductors along the center line. Here are some parameters: Target frequency: 10-20 GHz Size of lump ...
• 31
155 views

### Lumped Circuit Abstraction extreme cases

When using lumped circuit abstraction, if we consider two ends of a voltage source connected with ideal wire KVL won't hold; and also if we put two current sources opposite two each other, then the ...
476 views

### Why does lumped discipline not hold as dimension approaches operating signal wavelength?

I'm studying some basic introduction to the lumped matter discipline on my own. I completely understand where the first two constraints come from (i.e. lumped matter can only interact through their ...
• 33
321 views

### Design a passive amplifier

I am trying to increase the amplitude of my generated electrical signal by a passive amplifier. I have seen so many complex RLC circuits. But I have limited space for design, therefore, can I use a ...
643 views

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