Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lumped]

19 questions
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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 constant was derived. Can someone please provide an…
ConfusedStudent
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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 terminals, which is consistent with KVL and KCL),…
Ramin
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5 answers

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 receiver) at its ends, we talk about the signal…
Donggyu Jang
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1 answer

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 \$\frac{d\phi}{dt}\$ is not zero. In a circuit with…
stochastic13
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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{ [$\Omega$]}, \\ \phi = 180 ^{\circ},\\ \gamma =…
Cooltafel
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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 capacitor: 10 um, sit along the CPW (insert into a…
Sandbo
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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 this paper, which shows a split-ring resonator…
DK2AX
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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 must be larger than the delay of propagation of the…
Crazy
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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 trace to the antenna. I am aware that there is…
aditya_stack
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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
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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
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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 node in between won't obey KCL. Since there is no…
user249466
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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{MHz}\$) or if I need to model it as a continuous…
Simon R
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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 meaning of microstrip elements and how they are used…
John adams
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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? Book Ref: Electric Circuits, by James William…
markable
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