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1000 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 (...)
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
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 (...)
You can simply connect the coax shield to one plate and the center pin to the other plate. Then assign a wave port on end of the coax line. Or you can use a lumped gap source in HFSS by drawing a rectangle between the two plates. Then you would need to assign it the impedance value. Keep in mind that since the TEM horn is a balanced antenna and
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, Plese provide the formulae to calculate 1) Stripline electrical length and physical length 2) microstrip line electrical length and physical length 3) coaxial line electrical length and physical length Regards, Avi
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 stripl
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.
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..???
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
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 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
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
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
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 (...)
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!
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
Hi crazy_dude 1. There is solution to your problem go to port click left, properties and Insert the distance from the WG port to the patch that?s the way to get your Input impedance (dembedding the WG port). You can see it in the examples In patch antenna if you install them. 2. You can do it also with coaxial input. 3. Go to m
One feed method for spirals (I've seen it done for equiangular slot spirals) was developed by R.C. Hansen and is termed an "infinite balun". It basically consists of connecting the pin of a coaxial line to one side of the spiral and the shield of the coaxial line to the other side. The coaxial shield is (...)
you can use a wave port to feed the coaxial line. the inner pin should be directly connected to the lower p_a_t_c_h, and the parasitic p_a_t_c_h should be okay the way it is (floating above the fed p_a_t_c_h on a dielectric layer). Make sure the problem converges to a good delta-S value (such as 0.005 if you don't seed the radiation boundaries). I
You can use a lumped gap port on a 2D rectangle between the wire and the groundplane. Or you can use a wave port by assigning it to the outline of a circle on the groundplane (this treats the monopole like the inner pin of a coaxial line). The impedance of the lumped port is assigned by the user, while the impedance of the wave port is (...)
I did a simple calculation of radiation from slotted coaxial line about half a year ago. See attached hfss project...
Hi everybody: Just now I create a very simple coaxial line model in both CST and HFSS to study the correspondence of real waveguide to transmission line model. But the result seems confusing. My coaxial line is a inner PEC cylinder pin with the radius of a=1mm, and an cylinder PEC shell with the (...)
this actually depend on what you can measure :) you can measure the reflection the 50ohm coaxial line sees, which corresponds to the renormalized s parameters. You cannot measure the generalized s parameters. A very simple example for this is a dispersive infinite transmission line, the return loss should be zero, but after (...)
hi teknikalar, the type,or more directly, the specification of the SMA connector has a great effect on the accuracy of your measurement. Generally, the higher frequency result you would like to get, the thinner pin of coaxial line is needed. So the type of the SMA connector depends on the frequency intrested, especially the upper edge frequency. Y
I live in us and cable companies are offering phone, data and cable tv in one coaxial line which is shared. what is bandwidth for coaxial? last time I remember is between 50-70mbps am I right for this figure? please explain me how they do this workout pjone,data and cable tv? thank you all. I need to have a bit of knowledge.
As is proposed in some previous studies, i use an added U-slot on an octagonal patch, expecting to enhance the bandwidth. Actually, there are at least 3 important parameters: 1) the feedpoint of the coaxial line 2) the length of the U-slot 3) the width of the U-slot I tried to apply the optimizer, yet i don't know how to define the "user defin
For the transition between coaxial line and waveguide, the coaxial line should be about quarter-wavelength away from the short end of waveguide. In HFSS model, two waveports should be set in the end of coaxial line and the open end of waveguide.
hi, folks: Here's what I did. Draw the substrate box, the patch, the ground, a coaxial line feeding from the buttom and finally an air box surrouding them. Now the problem is: If I set the 6 faces of the airbox to the radiation boundary, and let the air box big enough to contain the whole coaxial line, HFSS will (...)
I am new to hfss software, I would like to simulate the electrical properties such as characteristic impedance vs. frequency of a novel grounded CPW structure embedded in a 50 ohm coaxial line. Could someone give me suggestions about how to start? Thanks a lot! Jim
attched is a very simple patch antenna model in CST. Actually the model maybe incorrectly constructed because of at least three abnormal results. 1. the resonant frequency is not around 1GHz since the width is 30mm and the permitivity of the substrate is 25. 2. the rad.efficiency is only 5% and tot.efficiency is 0.002~~(i exported the simulation
Your "lumped port" is inappropriate. You should draw a rectangle that fits exactly in the gap of the loop so that the antenna+the rectangle (over which the lumped port will be defined) forms a complete loop. To define a waveport for this problem, think of a way to excite the antenna through some transmission line. (The wave shall be guided by th
you need a quarter-wave matching stripline to compensate 140 ohms of helix with 50 ohms of coaxial line. you can use the txline software to calculate the stripline width etc. good day