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69 Threads found on Coaxial Simulation
I did not used HFSS, but I guess there must be examples for such antennas. You can start by altering examples, and make them from scratch to remember typical steps. For example, Sonnet lite have example of coaxial fed patch antenna.
Hi guys! I am here new like in a field of EM simulations. I started to use CST software for simulation microstrip patch antenna @ 5.8 GHz, feed with coaxial probe. I am interested which of the above mentioned solvers are better in sense of accuracy (which will give better matching with measured results of S11 parameter)? In addition if (...)
Hello, I have a question about an antenna simulation with CST Studio Suite. I have a Bowtie-Antenna, which is fed by a balun and a coaxial cable. 132366 I want to simulate the reflection coefficient of this antenna with CST with a differential feeding. Now my problem is, that I do not know which way of designing the an
HI, i have designed an cavity backed antenna in driven terminal using two co-axial coaxial feed length is 40mm..if i assingned air as material to the cavity i can run the simulation without the error and my return loss value is less than -10db.if i am assigning copper as material to the cavity i am getting very low return loss.what mat
Hi, I have a problem with my simulation in CST where I have a rectangular cavity with a simple SMA opening as a set of coaxial cylinders with dimensions I have checked to make 50 Ohms. I intend to simulate the resonance of EM waves entering the cavity and I calculated the dimensions of the cavity to fit resonance of around 2 GHz, but when simula
Hello guys, I designed a Microstrip to SIW transition at CST. It has been working perfectly as long as I use waveguide port for exciting the microstrip (s11 < -20 db). but when I use a coaxial cable for exciting everythings goes wrong. S11 is almost 0 when I use the coaxial cable. Does anybody have any idea why it happens ? my dielectric is
Did someone worked on marchand coaxial balun
Hi, I am trying to simulate a coax connector in HFSS and trying to correlate simulation results with theoretical formulae. Currently, I have modeled a coax connector with a GOLD inner conductor and PTFE dielectric(epsilon = 2.1). I have setup ports at both ends of the coax with port impedances 50 and 80 ohms respectively. As per theoretical
Hello everyone, Anyone can help me to solve my CST design for SRR antenna. I try to simulate my SRR antenna by using coaxial probe. But the problem occur when i place my antenna with different layer of human tissues body. Seems like this antenna not working well if I do simulation with skin,fat,muscle and bone layers. I change material of bone s
How can I draw magnetron vanes in HFSS? If I simulate a magnetron whit 2 coaxial cylinders,then how can I simulate the magnetic field applied to the cylinders? (in magnetron we have a magnetic field crossed with produced electric field(or electric current from cathode to anode) tnx alot
Hi, I tried the simulation with HFSS 13 and 15, and I got similar results in terms of matching and radiation patterns. My only concern is that you use an air-dielectric coaxial, or you forgot to assign material (e.g. Teflon) to the air in the coaxial probe. Regards, Pere
make a coaxial line for antenna and then feed it with wave port see patch example of CST
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
Hi, Have a look at this website : In HFSS, you can draw a 50 ohms coaxial line to feed this antenna. Look at the HFSS tutorial : there is one example that deal with a rectangular patch antenna feed by a coaxial line. A PIFA antenna will not be difficult to draw on HFSS.
I do not know your simulation but waveguides other than coaxial have other characteristic impedance than 50 Ohms. If you insert a coaxial-to-waveguide transition, the problem is solved in real situation.
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..???
Hello Ghasem, Can you provide a more detailled image/drawing so that I can have a better idea of the physical structure? What is your goal with this structure/simulation? More info may give us the opportunity to help you better. Generally spoken, when a coaxial cable sees a load that causes reflection (that means |S11| <> 0), the impedan
Hi Bou You should use port with dual polarity. the simulation results is very similar to coaxial excitation. Good Luck
You can find a good details about coaxial feed simulation in HFSS by visiting this link good luck
Hi. I has designed a microstrip patch antenna array in hfss.It's feed is an coaxial SMA.But in simulation the wave is not going throw the array.The inner in coax is tangent with the array and it's shield is tangent with the ground plate
I try your simulation and it is not possible, because your waveport isn't on a boundary. Instead of making a coaxial cable with vacuum. i would use a lumped port between the matching and the ground plane. For a first simulation this is accurate enough.
I am a new user on HFSS. And I am creating a coaxial probe. The simulation result in S11 does not show properly. Can anybody help me to have a look my hfss file? Thank you. 86358
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
hi to all. I wrote a 3D-FDTD code in matlab. I have a cylindrical dielectric antenna that surrounded by air(epsr=1).I know maxwell equations and discretized forms of them both in vaccum and dielectric.but I donn't know how import a coaxial feed to my dielectric antenna.this antenna is like of monopole antenna. I placed a differentiated gaussian
As far as I understand (correct me if I am wrong), the outer part of the coaxial is the ground of the transmission line (zero voltage), and the inner part carries the RF signal (varying voltage). Stefan, I tried to outline that this understanding is not quite correct. The zero voltage, or symmetric voltage, impl
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
Im a beginner in desperate need for help. I am designing a slotted bow tie patch antenna with a back coaxial feed which I have already created in CST. When a transient simulation is run, I get a practically non existant efficiency. When looking at the surface current, it appears that very little current is flowing on the patch surface. Where am I g
Hello Everyone The Problem i have here is more of a drawing problem in HFSS and not the simulation.I have a co-axial cable that is being used as an element of a bifilar helix,after drawing the helix,from the tip of helix the coaxial cable is to be drawn at 90 degrees from the tip.does anyone have any idea how to do this.i have drawn the conducto
Hi, there I 'd like to find some reference on simulation of coaxial balun. can anyone give me some advice? also I am confused about the impedance calculation of coaxial of say a EZ90-25 series semi rigid cable. From the datasheet we can see that its impedance is 25 ohms with outer diameter of 90 mils and that of inner of 40 mils, also (...)
hi.. need to feed an annular slot of avg. radius 7.7mm and thickness 1mm..need to do the simulation in hfss..tried alot..din work yet..wil be thankful if u cud help..
EM simulation software (e.g. CST-MWS), can calculate the current on the surface of conductors from the magnetic field solutions. Does anyone know how this current is calculated and what is it's meaning? In a coaxial cable, for example, is that surface current all the current that flows through the conductors? Or is there current flowing through th
check this out A waveguide cavity 180° hybrid coupler with coaxial ports - Navarrini - 2009 - Microwave and Optical Technology Letters - Wiley Online Library Directional couplers, Hybrids, Magic tees, Phase shift
There are good explanations and cable equations here as well: coaxial cable - Wikipedia, the free encyclopedia
Hello I'm a newbie to HFSS and I'm trying to design an inset fed patch antenna design using HFSS. Does anyone have any steps (not coaxial patch antenna) of the inset fed patch antenna design using HFSS? I'm trying to run this simulation for my school project! Any help is greatly appreciated. Thanks,
Hello! I am trying to simulate an Leaky coaxial Cable (LCX) on CST. I used the coaxial connector template. I am exciting the cable at one port with a waveguide port. I've changed the boundary conditions to open (add space), except on the waveguide (it is only open). The problem is that the results that I have for S11 are not the expected. Th
hi, i want to design an orthogonal dual patch antenna(using ie3d) each having 2 coaxial feeds..for L1 and L2 is a patent material..there is no specification...give me an to design it...
hello; im going to design a printed antenna withcoaxial feeding resonants at 3 and 5.5 GHz at the same time. i modelled this antenna with cst and hfss respectively. simulation results are fitting. so i fabricate this antenna and get the measurement results. but there are differences between simulation and measurement. i dont know what is (...)
hi i am a beginner and i am using cst for just one week and i designed a simple patch antenna and i applied coaxial fed waveguide port and ran the simulation but error msg came like this "waveguide for port 1 is too short" i urgently need a help in this.pls
I have simulated a coaxial balun which will transform 50ohm unbalanced impedance to 25ohm balanced impedance as the following The following picture is the simulation result, I get 100ohm impedance of port2 and port3. [url
Hello, I'm trying to simulate a ferrite binocular core in the VHf band (20 - 500 MHz) by AWR, I saw in the polyfet AN TB160 ( ) that the ferrite core is modelled by a coaxial wire with an inductor in parallel, could anyone give me the meaning ??
Hi.. I would like to design coaxial feed microstrip patch antenna. How should i define the port at the feed point.
why does my simulation work with coax excitation even without any outer conductor? And will the use of a pec-outer-conductor influence my results in comparison to these without any outer conductor? If you define your radiation boundary where your coaxial is outside the boundary, you don't need to define the outer conductor.
Hi! I guess you know how to set cpw-port. If not, please take a look at this document. You don't need to use the coaxial feed for your uwb antenna simulation. remove the coaxial and feed directly at the microstrip. That gives you good accuracy. draw a port and define it according to the document. And λ/4 distance is good (...)
Hello everyone, I am trying to simulate a 3x3 antenna array in HFSS. I am only concerned about the response of the center element, and thus only need 1 wave port. All of the stacked patch antenna elements are fed with a bottom-fed coax probe. Is there a way to ensure a 50 ohm termination on a coaxial probe without inserting a wave port? I wa
Hi! I think the problem is in the coax feed design. When you create a coax you should follow this procedure: 1)create cilinder with diameter of coax and assign material teflon 2)create vacum cilinder with internal conductor diameter: this cilinder must be coaxial with the one creates before (same position) 3)substract cilinder created at step
For the purpose of training and education, I am looking for an example of using HFSS to visualize the effect of an antenna connected directly to a coaxial cable. How to visualize the external current in the coaxial and see the difference when connected to a BALUN. Anyone has a model like this?...Or any ideas?
Dear all I am a student and i am trying to design 2 arm archimedean spiral antenna@60GHz in HFSS 10. however the simulation result of s11 can not be hfss design, i put lump port in center of spiral, between 2 spiral arms.I want to match it with coaxial 50 ohm. so how can I control the impedance of the spiral antenna.(How to r
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.
I simulate a micro coaxial cable ,but it always show a waring message, the content is "The current seeting will propably lead to a long very long simulation time". I don't know how to seeting the parameter for my coaxial cable, and can let the simulation time to be right. I post my file to here,hope anyone can (...)
Hi, I have an interesting problem to solve. I have coaxial resonator and I want find out its resonant freauency depending on temperaure. The influence of temperature ais modelled as alllenghts enlarementd depnding on one variable. The problem is that CST produces some jumps in the graph. Could anyone advise how to get rid of? I mean has anyone expe