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Lumped Element

177 Threads found on edaboard.com: Lumped Element

How to use Optimzer to build a lumped element model in ADS?

Hi all, I have a S2P files and would like to build up a lumped element model to describe performance. How could I do that in ADS by using Optimizer? Thanks a lot!

Antenna terminated in an impedance

since an antenna is, by definition, an electrically large object, you can not do a lumped element analysis of it. WHY would you want to terminate an antenna anyway? that would reduce the transmitter efficiency you heat up your termination.

100 ohm resistor in Wilkinson power divider in HFSS

I do not know HFSS, (I'm a CST type). Search on "ohms per sq". The length/width and ohms per sq define the resistance. Dimensions of the resist and thermal conductivity also defines the amount of power dissipated. Power dissipation may or may not be an issue to you. As a first approximation, throw an ideal lumped element resistor in to opti

Matching Network with dipole antenna

Hi all, Please, How can I use lumped element on a port for impedance matching purpose between a discrete port and dipole antenna in CST? How can I connected the lumped element, discrete port and antenna together ? what I use to connected them?

Why 50 Ohm Impedance Doesn't Really Matter At Low Frequency

if the frequency is low, then the length of line between the load and the transmitting device is "electrically short". Under this boundary condition, the entire circuit can be approximated by lumped elements. In this case you would terminate the circuit in the lumped element load that gave the most transmitted power, (...)

Designed a LPDA and I have a weird looking Gain Pattern

I have designed a 10 element LPDA and I want to achieve around 6-7dB of gain but I am getting an issue with the gain plot (see attached). It looks like there is some null on the PHI axis. I am feeding the antenna with a coaxial line and a lumped port at the end. I honestly have no idea why it is doing that... Hope someone on here can shed some ligh

applying T network in hfss

hiiii i am using a lumped T network in HFSS now i have to place this between two microstrip lines. s1 and s2 are the series arm of the T network and p3 is the parallel arm of the T network then how i am supposed to connect this to the two tr line. i connected s1 and s3 to the conductor of the microstrip lines and (by keeping two sheets and giving

[HFSS V14.0] How to match lumped ports?

Hello everyone. As a small test of the effect of port shape and size on their value, I've built a simple current loop of random dimensions with a capacitive element to make it a resonant structure at 128MHz. Looking at the eigenmode analysis result it behaves like it should. However, when I want to inspect its frequency behavior through a lumped po

hi, matching can be done using a shunt resistor. however the this matching network will incur high loss. lumped element matching is preferred but matching 500kOhm with 50ohm is impossible using lumped element.

What is difference between lumped element and distrubuted element model and its defn

What is lumped element model and distributed element model. How lumped model is different from distributed model. lumped elements means one can distinguish inductors and capacitors as separate components. When one cannot, like in line sections or waveguide sections, and optical (...)

help : How to design monopole antenna omnidirectional CST MWS?

hi the problem with this kind of design is matching. there is two way i know first one is based on lumped element matching. second one is increasing antenna diameter.

How to use Lumped elements with ports in CST

Hi, I want to use lumped element on a port for impedance matching purpose. I used a discrete port and then I used a lumped element. When I tried to simulate I get this error."The discrete port 1 has the same mesh location as the lumped element element1." Then I used (...)

CST MWS 2014 - Lumped Element Anomaly between Frequency and Transient Solver

Hi All Would somebody be able to help answer the following question: I use here a simple square loop in MWS layout window to illustrate the problem. With a port placed in a gap in loop and snapped to corners of structure, I see a imaginary impedance of ~ 180 Ohms @ 2.4 GHz. This corresponds well with a first order approximation of the loop in

Can we simulate far field in ADS EM Co-Simulation with lumped elements?

Co-simulation helps to combine planar(microstrip) based circuit and lumped circuit element as well as active devices in schematic form in ADS. One need to simulate layout elements in momentum and call these results in circuit schematic,to combine with lumped and active devices. You can see realtime response of your total (...)

Simple Dipole Balun Issue

I'm building a simple half-wave dipole in HFSS. I first made a model with a lumped port in the center to find a good length/radius. I then attempted to implement a full design using an "infinite" balun - I.E. I run the coax through one element of the dipole and attach the outer conductor to one end and the inner conductor to another. The iss

Does it usually happen that the simulated result and the measurement are not the same

curiouscase and volker, thanks for your replies. I have used Momentum for EM simulation, and murata design kit is used. Maybe it is because my lumped element are too close to each other. (My work almost only consists of lumped elements and devices in order to make it easier for adjustment or debugging) And how to simulate

Netlist extraction from HFSS

Currently, I'm trying to start work with HFSS software. I did simple stripline and I want to export it's model to cadence virtuoso. I can export it by s2p file and use it with nport, but I want to get it in a netlist view too. So, I found there are two able spice netlist types: full wave spice and lumped element low bandwidth netlist (by the w

Simple Wire Dipole Resonance problem

Hi, I have a wire dipole antenna which i modeled as a driven element for a yagi at 2.45 GHz. When i was modelling in hfss i used a lumped a port between two wires. But when i built it on an SMA it seems like there is an extra resonance introduced to the dipole right after the main resonance. Does anybody has an idea about the source of the prob

[moved] CST Discrete Port Problem

Hi, I wanna ask, when I try to edit (resize) the dimension of copper element of RF coil which is has some lumped elements, placed by pick point, I never get the result. There always notification "No points picked for location of discrete port". Then I try to delete the lumped element first, but also I get (...)

I'm getting an error "there are no ports connected to the circuit ..." in momentum

Hi Do you have set the ports in the Layout Layer 05_comp ? Please double check the ports setting are correct. if you want to simulate microstip line with lumped element in the moment, the ports are must following setting rule of ADS. thanks

Design Band stop filter for 3.5 Ghz using lumped element

Some time ago I've tried with reasonable results an open loop resonator structure as in the link below, using cheap laminate. Depending by your requirements (loss, bandwidth, rejection) the circuit can be small enough compared to a lumped element design, which anyway would not have consistent results at those frequencies. www.researchgat

How to Convert Transimission Line to Equivalent Lumped Element

Hi, Below is link talking about the PLL operating at 75GHz: Could any experts explain me how to convert the VCO loaded with lossy transmission line to equivalent VCO loaded with lumped inductor? I mean, how to calculate the equivalent inductance of the lumped inductor. I am qu

Switch Simulation in CST

Could not get your attachment. lumped network element is not correct, because your diode is nonlinear. Place your ports on both sides and add in the schematic window a model between both ports and run your simulation.

CST MWS discrete port on ground plane

Hello all, I need some help/suggestion with my design in CST MWS. I have my structure with several lumped elements (inductances and capacitances). I thought of directly using the S-Parameters of these lumped element values directly provided by the manufacturer instead of using the static values. For this, in general, we (...)

High selectivity lumped element bpf

Yes you can do it this filter with lumped elements but the insertion loss will be very high due to high selectivity requirements because you will have to use many lossy components. Instead, if you can design a helical/rod EM coupled filter in a good cavity, the insertion loss will be lower and the selectivity may be as good as wanted.

TLIN and MIM-Capacitor Characterization using Chebyshev Filter

Hello Guys, I need your help. I have created lumped-element models for single MIM-Capacitors and for micros trip transmission lines. I also got three 3rd order chebyshev low passes, built of MIM-Capacitors and tlines. I want to use these filters to do any characterization about my MIM-Capacitors and my lines. I want to extract any informatio

In ADS, What is the equivalent lumped values of DC_Feed and DC_Block values

The DC_Feed, DC_Block and Short components are ideal elements that simulate as the same element with a different Mode parameter. There are parameters for C and L but these are used for transient simulation only where the ideal equivalent is no longer valid. DC_Feed has Mode = -1 which blocks AC (all freq > 0Hz) but passes DC (freq = 0Hz) Short

Import CST results to MWO

Hi folks, i got a CST Structure with waveguide and differential discrete ports. -> How can i import the simulation results to MWO? The waveguide ports should be connected to 50 Ohm ports in MWO and between the differential discrete ports i want to put a lumped element circuit. The whole thing should look the same like in CST DS! Can

Can someone theoretically explain why capacitive loading decrease electric length and inductive loading increase electric length? Are there any papers and books to explain this? Thanks in advance.97893

connecting lumped elements with resonator

Hi every body. pls, can any one support me? I need connecting lumped element(variable capacitor) to resonator using cst simulator. warm regards.

eigen mode solver in cst

how i can use cst s eigen mode solver for structure which has lumped element . i attached lumped element with discret port to my structure and when i want to run eigen mode solver i get error that eigen mode solver doesnt support dicret port :-(

Can i replace short-circuited stub L with open-circuited L+lambda/4?

at ONE FREQUENCY they are equivalent. But the longer a line gets with respect to one wavelength, the farther its response departs from approximating a lumped element. The common result of this is smaller bandwidth. So one tries to stick with either lumped elements or short matching lines

what is mean of phase shift in a antenna array in hfss simulation?

Hi. I have an array antenna(with two element).the elements are λ/4 monopole antenna. distance between of elements is λ/4,also. I want to simulate this array in I used from two lumped port for two antenna with same "port line" in HFSS as attachment.NOW I have one question: what is mean of phase shift between (...)

Simulating a CPW Resonator in HFSS - Modal Wave Port or Lumped Element Terminal?

Hello, I am simulating some lambda/2 series CPW resonators, and have been getting some disagreement between my results when simulating by Wave Port or lumped Terminal. They both show resonance at roughly the expected frequency, but disagree on order of a few hundred MHz. I am inclined to believe the wave port results as they are close to ADS Mo

Help need to convert lumped element model LNA to using MLIN fabrication level.

You take the advice already given about the basic parts you need. Then, you make the circuit again, using microstrip parts to include a short piece of line at the input up to the capacitor which is likely 50 Ohm. You place a MSUB element, and fill in the values concerning the substrate, like thickness and Er. If the capacitor needs a footprin

Narrowband Bandpass Filter--Correlation between HFSS & ADS Simulation!!

Dear Experts, I am Designing a Narrowband (30 MHz) Dual Mode Band Pass Filter. I have done the HFSS simulations inside the cavity of (30*30*30mm) with a cross shaped dielectric resonator. I have a also generated a lumped element model in ADS of the same filter. My Question is how can i model or correlate the input, output and mutual couplings fr

cst help (urgent) (lumped element)

i want to simulate a structure with cst and because it hase both lumped element (a block with s21=-1, which produce pi phase shift) and electromagnetic structure i think i should use this feature :electromagnetic-circuit co-simulation in cst but i dont know how . :?: :?:

Interconnect modelling for high speed vlsi

negative equivalent component values, oddly enough, are not that unusual in modeling. It happens in microstrip models all the time. What is going on is that there are electromagnetic solutions to the circuit, and they have energy stored in various evanescent modes and various phase shifts. To get a simple lumped element model to match the real wo

Dear All, Does anyone can show me a example of how to implement a customized lumped element in ADS which is independent of frequency ? For example, I want to simulate an reactive element (jB) shunt to ground where the susceptance B is idependent of the frequency. So I imagine it requires to implement a box or work around in the (...)

dispersion diagram for a structure containing lumped element

Hi all, Can anyone help me in finding the dispersion diagram of a planar structure containing a lumped element using eigenvalue solver in cst??. When i tied doing this using both AKS and JDM methods, its throwing errors. Thanks in advance

What is Quasi Lumped resonator?

Quasi-lumped L or C is realized by distributed elements.

substrate height 0.8 or 1.6 frequency response 0.5 -3.5 ghz substrate maximum size 70*70 or 60*70 using software cst mws 5 problem is how to i resistive load in software by using lumped element & how to put wire ?? figure 74420

reconfigurable antenna (lumped element)

in CST using the lumped elements you can simulate the RLC/Diode elements easily.

Power divider simulation in CST

I have design a physical rectangular coaxial power divider ( 4 way) and wanna simulate in CST. At first, I draw mechanical 3D then import to CST. I'm using both waveguide port , lumped port but the results look not real (S21 ~ -108dB) - Must I have terminate other port by lump element when simulate S parameter? I the C

Ground Vias placed around Signal Vias

There is fringing capacitance where the lead in/lead out line attaches to the via. The via itself is somewhat inductive. So you end up with a lumped element model of a shunt C - series L - shunt C. For lower frequencies (<10 Ghz) the capacitance and inductance is such that at least 2 ground vias are needed to keep the insertion loss low. Up a

Low Freq Impedance Match to capacitive element

I have an pizo load element of which is capacitive nature (ZL = 1.2 -J-0.85) normalized at 15KHz. I have Class D power amp driving into an impedance match element. It is basically H bridge with series inductor and capacitor as smoothing filter. Has anyone have lumped model representation of the power amp and how this is represented in (...)

need to match this dipole array URGENTLY

Guys, I really would appreciate your help in matching this 5-element semi-circular dipole array which is excited by 5 lumped ports in HFSS. What offset excitation port phase under Edit Sources do you use when matching it? Is it the same phase I want to steer it at? I read in Stutzman book that arrays are usually matched at broadside or

Simulating Mutually coupled inductors in HFSS

1) Yes. Assigning a finite conductivity boundary enables u to evaluate the output resistance. 2) You can assign a lumped element at the port of the second coil and observe the current flowing through it. Then the power absorbed by the load resistance can be calculated straightforward. The current through the second coil can be deduced by an integra

Active Z Parameter in HFSS

I need someone to confirm what I am doing is correct in HFSS. I have a 3-element phased array that have lumped ports. I impedance match all the sources using the re and im values in Active Z Parameter plot instead of the Z Parameter plot. Is this correct? I take it Active Z stands for the active input impedance of the array elements. HFSS do

lumped RLC model in hfss

Hi, lumped elements are designed like lumped ports in HFFS. First you have to create a face (rectangular, ...) between the two connection points of your lumped element. Then select the face and choose 'Assign Boundary' -> 'lumped RLC'. There you can choose the parameters (R, L, C). At the (...)