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21 Threads found on edaboard.com: Microstrip Lines Port
Hi, I am simulating an amplifier in EM mode of Ansoft by importing the S2P file as an N-port model. Using the circuit designer with ideal loads of 50 ohms, I get the right gain (S21 parameter) of 13 dB. When using microstrip lines with physical dimensions corresponding to 50 ohm load, it shows -3 dB gain. I don't (...)
Your previous posts suggest that you already know something about RF circuits. So I presume you know that RF components are connected by transmission lines, either cable or embedded in a PCB. Here you are asking about single ended ports, connected by coxial lines respectively PCB microstrip and striplines. (...)
I am simulating for Insertion loss, Return loss and characteristic impedance of a trace on a piece of dielectric. I would like to know if the simulation results will be correct, if I do not use a ground plane (imagine a microstrip but no GND plane). Is return plane a necessary criteria for calculating S-parameters? I am a newbie to EM simula
Hi I have recently shifted from Agilent's Momentum/EMDS to Ansoft's HFSS to simulate microstrip lines based RF Circuits (like, WPD, BLC, etc.). Need suggestions for different port options for correct simulation. Currently, I am trying Waveport option with dimensions being calculated from Waveport (...)
Hello, you are right, when you feed it via a capacitive gap or directly from another microstrip, you have two same length lines. The resonant impedance will be high when each half is a half wavelength long. Though they are connected at the end, they appear as an open circuit. The waves from the two halves appear at the opposit side same time and
Can you be a little more specific about your project? What are you simulating? If it planar (microstrip for example) the rules for defining size of waveguide port exist (depend on substrate height & microstrip width). Additonally for planar projects i usually simulate SMA connectors to connect to lines (after it i added (...)
Hello I'm trying to learn CST and I don't understand well how ports are defined. For example I found a pdf tutorial that simulates a wifi antenna fed through a coaxial cable. And they define the port like don't understand why they just pick the shield of the coaxial and they don't spe
hello every one, i am designing a wilkinson power divider in ADS momentum, so to place a resister between the two output arm i draw a microstip line from each arm. when i insert port at the end of these microstrip lines, and trying to define the type of ports i get this message " port P4 cannot be (...)
I am having some problems with simulation of multiple coupled microstrip lines. I would like to adjust the width of the individual strips such that the input impedance of this line is 50 ohms. I am having issues with the port declaration to verify the input impedance. I have read the Waveguide port Overview in the CST Help (...)
There's plenty of info if you google it. The HFSS manual even has an example of microstrip transmission lines. You will just need to adapt it to your coplanar strip line. Try: port Tutorial CPW
Hallo, within my port_only_simulation (HFSS) of coupled microstrip lines (2 top strip conductors, bottom ground layer) the even mode impedance is smaller than the odd mode impedance. Which gives negative k values. k=(Ze-Zo)/(Ze+Zo). The waveguide port covers the full plane. Any ideas ? Thanks for your help. elektr0
can anybody tell me how to define a lumped port for coupled microstrip line and where should I place the integration line in hfss? The problem is that I think it would be inaccurate to draw the port just between the upper stips because this won't take the ground plane effect. Thanks in advance!
HFSS has no problems with coupled microstrip lines and their port fields. You need to correctly define the port.
Design of Broadside CPW- microstrip Coupled lines ... having problems abt defining the ports. could any one help me out
Hi, Can anyone suggest how i can determine the crosstalk of 2 adjacent microstrip line or CPW line using 2 port VNA measurement setup. Any help will be much appreciated. Regards magneto
it is not WAVEGUIDE port, but WAVE port! It feeds waveguides and all kind of transmision lines ( microstrip lines as on the picture) I actualy prefer lumped port, for microstrip lines. wave port often gives acuracy problems.
espercially coupled lines? wave port or lumped port?
Hi, I have many questions as follows.If you are free,please give me advices. 1. As I simulate a transmission like structure,such as microstrip line,two solutiion types can be choosed.I run the simulatiion separatey and get different resluts(for Driven modal,the mode number I set up is one).Which one is correct? 2. The number of mod
Hi, Adhi: Here are some models (edge fed, infinite gnd & sub, finite gnd &/or sub) for the 8 GHz range. You can start from them. I do want to warn you on the substrate thickness. The 2nd order mode should happen at about 30 GHz for a 0.35 mm thick substrate. Even you can use edge fed, microstrip lines in this frequency range with such a thic
Hi, I think your main mistake (which is very common actually) is that in HFSS in case of microstrip lines, the port size changes the results. So you must adjust the port size to get an input impedance of 50 ohms, which is actually not a very pleasant task. also you should check the convergence and increase the maximum (...)