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# Coaxial Transmission Line

49 Threads found on edaboard.com: Coaxial Transmission Line

## Microstrip Transmission lines .. need some Clarifications

Microstrip lines are same as other transmission lines like waveguide and coaxial cables. So transmission line theory is the pre-request before starting design process. In Microstrip lines it is the length of line which defines your components like inductor (...)

## Point Excitation in HFSS

I doubt a point source will couple well to a transmission line mode, but that being said, your best bet is probably to couple it to a coaxial mode -- since I lack knowledge of any literature on the subject, I'd guess that a parametric sweep on the placement of the excitation is an adequate start. Good Luck!

## Defining a Voltage source using a Probe

when there is a probe it come with coaxial transmission line too. and its clear how to excite coaxial line with voltage source

## reflection of electromagnetic wave

I understood you have to calculate the length L of a coaxial transmission line at wich the input impedance is a short circuit when it's left open at the other side. at a length equal to a quarter wavelength (and it repeats every rotation of pi) an open circuit at a side of a line will be seen as a short to the other side (...)

## 2 GHz 180 degrees phase shifter circuit

Same length of various transmission lines like: stripline, microstrip, coaxial, waveguide, twisted-pair, etc, would give totally different phase shift. On top of this, the same length transmission line made on the same approach (stripline, microstrip, (...)

## What dose this result mean?S12?

You are looking at the insertion loss through the sample length of coaxial line as a function of frequency. These graphs simply show that the loss per unit length of this transmission line increases as the frequency is increased.

## Litz wire at VHF frequencies and best core type?

No, litz wire won't provide any real advantage at VHF. coaxial transmission line transformers are probably your best bet, and 61 ferrite is a good starting material. Low permeability powdered iron mixes like 17 are more suitable for high-Q inductors, and wouldn't make for a very efficient transformer. Plus I don't think anyone makes powdered (...)

## S parameter in RF cable

a power of 0dbm is fed to a coaxial cable . this coaxial cable is connected to an antenna. so the power will be sent through the antenna. i know that in RF we could not speak about the voltage. But could someone tell me what is the Voltage and current in the coaxial cable?

## Coaxial Transmission Line with Discontinuities - Overall S-Matrix?

Hi, I'm working on the following problem but I'm getting stuck, I wouldn't mind some ideas on how to proceed: "A coaxial transmission line having two identical discontinuities as shown below. Calculate the overall scattering matrix seen at the reference plane shown at 4 GHz assuming that the scattering matrix of the discontinuity is: (...)

## Broadband VHF/UHF Amplifier Design Using Coaxial Transformers

Hi all. 1. In given figure 2, the inductors suppose to simulate ferrite? 2. Additional question: for what exactly we need ferrite here? 3. Do somebody have some detailed tutorials/bo

## Calculation of reflection coefficient using FFT in FDTD code (matlab)

I want to obtain the reflection coefficient using FFT in a transmission line, the source was excited with a Gaussian pulse. Τhis is an abstract from a paper that I have as guide: "In order to obtain the reflection coefficient, the coaxial cable was excited with a Gaussian pulse of the form Vs (t) = exp(-(t − 3Ts)/Ts) Ts (...)

## What is a double terminated coaxial cable?

Hi All: While reading the datasheet of EL8108, In page 11, it says, " The EL8108 was designed with driving multiple coaxial cables in mind. With 450mA of output drive and low output impedance, driving six, 75Ω double terminated coaxial cables[/

## coxial pitails for up to 6GHz

I think, the question makes no sense. You are talking about a PCB to coaxial transmission line transition. This means, the "pigtail" has to be soldered exactly to the end segment of a 50 ohm microstrip or similar transmission line. It can't be connected e.g. to the middle of a transmission (...)

## How bandwidth depends on transmission line or channel?

Hi; Consider a coaxial cable, there are two conductors, outside shielding and inside dataline. Between them there is isolator. This is a simple capacitor. And any capacitor filters/distorts after a certain frequency range (consider reactance of a capacitor 1/wC). This parasitic capasitor determines your channel bandwidth. Above those frequencies yo

## FDTD problem:coax feeding and transmission line feed model

hi. I have a question in FDTD and antenna feeding. I want to feed my DRA with coaxial cable and transmission line feed model.I wrote a code in matlab. do I have to use from thin-wire modeling,to model inner conductor of coaxial cable? how model outer conductor of coax? I'm confused really!!! please help me...

## transmission line feeding in FDTD matlab code

hi. I have a problem in feeding of my monopole antenna.I have a monopole antenna above ground palen.I want to simulate an coaxial line feeding for my antenna.for this purpose I want to use from a virtual 1D-transmission line for coaxial line modeling.but I have a question: in addition to (...)

## Questions regarding delay in wire

As in most cases, the question suffers from an incomplete problem specification. Wire capacitance and inductance are unknown without defining the full geometry. To refer to a well-defined case with known electrical properties, you can assume that the wire is part of a transmission line, either coaxial or parallel wires. Then increasing (...)

## 1:25 transmission line transformer

Z0 =√(Zin * Zout) applies to λ/4 transmission lines used as (small band) impedance converter. Wide band transmission line transformers with magnetic core a different thing. The characteristic impedance of the coaxial cable is still an important parameter in TL transformer design. Basically a (...)

## CST-Dipole Antenna-Coaxial feed transmission

Hello , I have create a dipole antenna using cst MWS but with a antenna wire template , i have put the port but i want to put a coaxial cable as feed transmissin line because i want to see the real result for the simulation. Anyone can help in creating the coaxial cable ? It's truly urgent !! Hope that this post will help

## AC current and Electromagnetic wave propergation

Hello, This makes sense. If this is your first introduction, the diagram shows a lossless transmission line (coaxial cable, two wire line, microstrip, strip line, etc) with source and load. The cable parameters are Z0 and beta (2*pi/lambda). It is used to explain the concept of interfering travelling (...)