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 ...
Field Wave's user avatar
3 votes
4 answers
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. ...
Field Wave's user avatar
-1 votes
2 answers
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 ...
Field Wave's user avatar
7 votes
3 answers
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", ...
lukas123321's user avatar
0 votes
0 answers
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 ...
aditya_stack's user avatar
-1 votes
2 answers
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 ...
Ambica Govind's user avatar
1 vote
2 answers
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{ [$\...
Cooltafel's user avatar
0 votes
1 answer
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?
sajib sn's user avatar
1 vote
1 answer
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.
Wallflower's user avatar
1 vote
1 answer
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 ...
Sandbo's user avatar
  • 31
0 votes
2 answers
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 ...
user avatar
3 votes
2 answers
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 ...
Ramin's user avatar
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-1 votes
2 answers
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 ...
Rifat's user avatar
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0 votes
2 answers
643 views

Lumped parameter vs transmission line model for a piece of cable

I would like to model a piece of cable (less than 5m) over a frequency range of DC to \$1\mathrm{MHz}\$. I am however doubting if I can approximate it by a lumped parameter model (mainly at \$1\mathrm{...
Simon R's user avatar
  • 185
0 votes
1 answer
561 views

Difference between a circuit developed using lumped elements and microstrip elements (transmission line)

As the title implies, what is the difference between lumped elements and microstrip elements? According to my understanding lumped elements are discrete elements but I don't understand what is the ...
John adams's user avatar
1 vote
0 answers
365 views

How do I set up a lumped element equivalent circuit?

In the treatment of metamaterials, optical problems and antennas, very often a simplified model is extracted by considering only lumped elements. In some cases this is fairly obvious, for example in ...
DK2AX's user avatar
  • 911
4 votes
1 answer
7k views

Lumped-element delay lines using LC circuit

I was told that the above circuit is used to delay signal. The time constant per element is t = sqrt(LC). The expression was provided by the book I'm reading, but it did not include how the time ...
ConfusedStudent's user avatar
0 votes
1 answer
86 views

Why the circuit theory works well when a lumped-parameter system has dimensions of one tenth of the electromagnetic wavelength?

Why the circuit theory works well when a lumped-parameter system has dimensions of one tenth of the electromagnetic wavelength? Why not one third or any other ratio of the electromagnetic wavelength? ...
markable's user avatar
0 votes
1 answer
827 views

How does short length of transmission line approximate to a wire?

Suppose I have a transmission line of length \$L\$ with characteristic impedance \$Z_0\$ and load voltage \$Z_L\$. If it is connected to a ideal sinusoidal voltage source \$V_s\$, then the voltage ...
praveen kr's user avatar
1 vote
1 answer
2k views

Explanation of lumped matter discipline

There are a total of three postulates of lumped matter discipline. Rate of change of magnetic flux outside the conductor is zero. The change of chrage inside a conductor is zero. Signal timescales ...
Crazy's user avatar
  • 123
2 votes
5 answers
1k views

Why don't we talk about a signal reflection when we treat a lumped element model of a circuit?

I don't clearly understand why I have never seen a talk about a signal reflection in a lumped element model. When there is a transmission line connected to circuits A (signal emitter) and B (signal ...
Donggyu Jang's user avatar
2 votes
1 answer
632 views

How is an inductor a lumped element?

While learning the Lumped Circuit Abstraction (and the Lumped elements discipline), an inductor was considered a lumped element. But I fail to see how it fits the requirements of LCA: For it, the \$\...
stochastic13's user avatar
0 votes
1 answer
1k views

Questions and confusions on transmission line theory and lumped element model

I want to model a simple signal transmission system by considering it as travelling through a transmission line. Here is the system: The original signal generated by the transducer is 0 to 10V step ...
user16307's user avatar
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