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312 Threads found on Coaxial Line
Hello~. I want to know peak power in coaxial line or waveguide by mws or hfss. Please, let me know. Thank you. Hello.. simulate electric field distribution in your waveguide and find maximum value (usually near the transition). You can calculate (better to say estimate) maximum power then from breakdown of air (
Hi, I'm trying to implement a DRA fed by a coaxial line using FDTD in Matlab. I'm following the implementation exposed in : A coaxial probe feed model for FDTD Microwave and Optical Technology Letters Volume 34, Issue 3, Date: 5 August 2002, Pages: 193-198 Riku Mäkinen, Ville Kangas, Janne Lahtinen, Markku Kivikoski The code seems to (...)
Hi. Does anybody here know any circuit simulator have rectangular coaxial line component. As far as I know ansoft designer have round coaxial line components in the circuit simulator. But I have to model a low pass filter with coax line of retangular cross section. Can anyone have idea where to find (...)
Hi, I need to simulate at CST preformence of reflector (dish)antenna (that have the dimension of d=12cm,f=8cm,freq=34.3GHz) and compare to the specsification of the real one reflector antenna I am using the the tamplate from :macros\constract\online\reflector dish but in this tamplate there isn't a feeding point (coaxial line port (...)
Can anyone help me ?? Coz i would like to design a circuit where i can transmit serial data over the MATV system via the coaxial line to all receiver. How to superimpose the digital serial data signal into MATV signal and extract out from any outlet ??? Is there any standard devices for such application ? TQ
Actually I didnt get much information about your setting of excitation and lunmped port, I can only base on what I guessed from ur figure. And also you can connect the coax pin out with coaxial line, then can use wave port outside the waveguide, we can catch all information about the mode transition. Best Regards,
Hi: why are you going to feed your antenna with coaxial cable ? if your antenna is a fixed loop antenna , I suggest you to utilize current feed or voltage feed . because : those are BALANC feeds . I think it is better . good luck.
one of the best and simplest balun from coaxial line to tem line is describe in this article: "a wideband balun from coaxial line to tem line" by P.R.Foster and Soe.Min.Tun
Hello all. I would like to design a coaxial coupler. I will use it as a reflectometer. Is there any paper where it is shown how to calculate the coupling coeficient between the center conductor of a coaxial line (air dielectric) and a second conductor beside it (far from the center)? Anyone of you has a paper about this??? Can anyone (...)
Hi All, How do you feed a tem horn antenna with a coaxial cable. How do I connect the outer and inner conductors and to which plate. I'm trying to draw this in HFSS. Please provide a rough sketch on this. regards, newbie101
Haven't used it lately, but with version 6.3 or earlier, you have to draw the coaxial line and excit it with a "lumped port". There is no option for "wave port" in xfdtd.
Dear Friends, I am studying the patch antennas . I am confused by the coaxial feed type, here is my questions and thank you very much for answering. 1, how can I locate the feed point? Is the distance from edge calculated as the same way as the inset feed? 2, can I treat the coaxial line as the input impedence? Is the lenght of the (...)
hi,all i'm trying simulate periodic structure in Collin's book " foundations for microwave engineering" chapter 8 page 552 ( capacitively loading of coaxial line),by HFSS, I want define Master and Slave and Floquet port, but i don't know how consider master and floquet? i will be great full if any suggest.
If you need to transmit a 2 GHz signal, usually the best choice is to use a coaxial line. If you want it to continue on a PCB, then there are the following rules: a) as most of test equipment and integrated circuits and filters, etc., operating at 2 GHz, are specified for 50-Ohm impedance, you should design the PCB stripline to match 50 (...)
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 using from (...)
My HFSS version is old and I cant open your file properly. But I think that you don't add boundary condition to outer conductor of coaxial line.
The problem is I am designing a microstrip antenna array,that if I want to match the line with other arrays,the problem goes to very hard! I want to matching with one line and other lines can be half-wavelength with open ends to not effecting in matching! I don't know this idea is good or not! Another problem is impedance that
hai.. Now I am designing a microstrip patch antenna with coaxial feeding technique....I am using CST microwave studio for simulation purpose..and I am new to that software ...I need to know how to fix a coaxial line in the antenna for feeding purpose by using CST Microwave studio..???
I have a PC with Tv tuner card. The reception was good when my PC was in one room. I brought my PC to other room & hence i had to use another cable (a new one). After that the reception quality was bad specially for lower frequency channel. I use PAL BG standard. Can anyone help me to get my quality back to normal or tell me how can i find the fa
Just insert the source between the upper and lower halfes of the dipole. At this point the coax feeder shall see a 50 ohm match. 'line' in your figure is assumed to to read 'coaxial line feeder'.
hello everyong i meet some difficults when i design microstrip filer with HTS,i use hairpin-comb constructure,but the port of the filter is too thin to connect with the coaxial line but i think it can not realize impedance matching(Z0=50) when let the port of the filter be can i to do with it! :( i am very sad,i will cannot gra
Edge or coaxial feed?
Hello Egemini Im not sure about the coaxial part, but Transformers are used basically as an impedance transformer. Most output of PA have very low impedance's. So a transformer (V/I = Z) that's 10:1 can make 5Ohms to 50Ohms . Look at Toko or Coilcraft website for better infomation. Hope this helps
to get (accurate) radiation pattern, you can use only "gap" port; to obtain both (accurate) input impedance and pattern, you better draw a coaxial line and use wave port on the far end of the coax to simulate your probe feed. Another option is to use a microstrip and wave port. It seems the appropriate length is dependent on the problem. If the
Hi, Lately I encountered an error message by the solver in C/S/T M/W/S, that the port is all covered with metal. What does it mean? It appeared when I added a port to the end of round coaxial line (inner and outer conductors, dielectric between them). I have defined the port by choosing the face of dielectic at the end of the coax li
Hi Waveguide and coaxial cable have good ability in 10GHz .which should choose depending on many factors such as loss ,volume ,weight ,interface form and so on .Please select according your demand .
Hi all! I'm a beginner in HFSS. The first thing I'm trying to do is simulate a simple monopole Lambda/4 antenna with an infinite ground plane. I have a problem with this, I'll resume what I've done: - I've drawed a 2D plane, and then substracted a circle. - Then, I've drawed a coaxial line. The outer cylinder has the same dimensions that the 2
Hello people, I need to design a rat-race in C (5.03 GHz) band. What technology do you suggest in terms of losses and weight? Stripline, WG or coaxial line? Thanks for your support. Lupin
hi people, i ´ve been working latelly on microstrip p@ath antennas, and altough i´ve followed a coupled of books i still have some doubts about feeding...more precisely: I´ve fed the p@atch with an inset feed, the proper width should have been 28 mm (by fomula & software: appcad;linegauge), but i ended up matching the antenna with an 18 mm microst
Yes it's possible to eavesdrop signals from a coaxial cable, for instance. Flexible, low-loss cables have bonded metal tape outer conductors with braided overshields. This construction provides better than 90dB shielding. Winding a suitable pickup coil (e.g. tuned) along the coaxial cable, and connecting the coil to a sensitive receiver, will do
1. network 2. communication media to relpace the coaxial cable of security video. 3. any kinds of contemporary communication media .......
Hi mwhero, Maybe there is a misunderstanding here. From your previous post, I got an impression that you want to model the antenna with probe feeding. Usually for microstrip structure, you can measure using GSG (ground-signal-ground) probe. This kinda excitation can be modeled as described in the previous attachment. However, patch antenna us
Extend your feeding line (I suppose coaxial line or microstrip line) to the radiation boundary. Make port at same position as radiation boundary and design feeding line to be at least λ/4 far from structure.. From what you wrote I suppose you're using HFSS.. However in MWS you don't have to care if (...)
is it the periodic stripe off the outer conductor of coaxial line? I remembered in forum someone has post similar structure, I have tried to do the simulation, but the results are very very bad. If there is any more updates please share with me. Best Regards,
The location of your rectangle ports are located inside the substrate, it is not possible to use waveports, everything in your model is fine, but we need change the port to lumped port, and we can still reduce the size of that rectangle to minimize the interence to whole model by this small piece of metal plane(ports are treated as the perfect E).
The SMA connector is designed to achieve coplanar matching with the outer conductor. In other words, the center contact, dielectric, and outer conductor all lay in the same plane. The dissimilar coaxial line sizes of the SMA female connectors produce a capacitive discontinuity at the reference plane that increases the VSWR at high frequencies (up
Hello everybody! Does anyone experience to make coaxial cable model (not straight line model. It must be curved line) by using HFSS? If someone has make it can you explain a little bit how you was make it and what materials you was use in this model.
I want to design a highpass filter.the pass band need to be 6G-12.75G There maybe three choices:microstrip ,coaxial line,stripline As I know ,when the frequency is increasing, high modes will appear in the transimission line, this is the cause for deterioration in the high frequency end. I know that (...)
To avois reflections, termination resistor must be with the same value, as charatceristic impedance of cable. Characteristic impedance of cables used in 10base2 and 10base5 is 50 Ohm. 49.9 Ohm is the closest value to 50 Ohm in resistor E96 series, and guarantee matching. Tolerance of coaxial cable impedance is 1% for quality cables and much wor
How to estimate the reflection of two segments of coaxial transmission line with same characteristics impedance but different size?
Has anyone got a 50 ohm SMA coaxial cable HFSS design, Al
Hi, Can anyone tell me how I can optimize the transition between the coax to microstrip surface? Any rule of thumb like solder, epoxy amount, shape of connector etc? I am refering to high frequency usage that use connector like 1mm or 2.4mm. Thanks in advance
The EM wave is actually generated due to the voltage and current applied to the transmission line (coaxial cable in this case). So when you apply a voltage to the TL the current passes through it and an EM wave is generated. I hope this was helpful :)
Hi hiru, if you want to simulate a microstrip antenna and feed it with coaxial cable from under ground plane, it is very simple to draw and define boundary. 1-you should draw a coaxial cable with/with out thick sheild. (you have 2 option) 2-unit the sheild to gnd if you draw a thick sheild. 3-unit inner conductor of coaxe cable to patch. 4
I am simulating a mono antenna feed by coaxial line, and find that different length of coax line will lead to different S11 parameters. What length on earth should be? I have no idea to find the principle, Can anyone help me? Thanks very much!
I would not recommend using the UltrCad differential impedance calculator, bought or otherwise - for some reason it is based on the flawed theory that the separation between the +/- legs of a differential pair have no bearing on the impedance - a highly disregarded theory, based on an assumption that a stripline trace represents essentially the sam
hi myem, for this purpose we use the 'open ended coaxial line' method. we use the material analyzer hp 4241a togehter with a network analyzer. you will find many publications about tis method. best: ricy
These are ordinary coaxiala transmission lines with ceramic materials for dielectrics. These have a very high dielectric constant and thus make the wavelength in the line much smaller compared to regular cables. They are made by first molding the material in a hollow cylinder form and then plating metal on the inside hole and outside. (...)
Hi I want to know how can i measure the impedance of a microstrip antenna. The problem is : With a microstrip line if i feed the antenna i don't know its input impedance. And for the feed line i will need to design it for a certain impedance. Now there will be a mismatch. In IE3D i have a option to define a port on the edge so i can know
All basic info on coaxial cables you can find here: and coax equations: Regards, IanP