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142 Threads found on Coaxial Line
what it mean by 50ohm coaxial feed line . .. how can we define for that
I want to design an antenna element in IE3D.The antenna consists of a pair of folded dipoles.The dipoles are coupling fed by an L-shaped microstrip line.The dipoles are printed on backside of the substrate while the L-shaped microstrip line is etched on the front side of the same substrate and it is fed using a 50ohm coaxial cable. Can (...)
Coax lines have a dominant mode with zero cut-off frequency and theoretically if the coaxial cable is good quality, and its impedance is the same as the source and load impedances at its ends, the cable do not affect the connected circuits and its length is meaningless. Only the insertion loss will change with the length. Sometime, if the source or
Same length of various transmission lines like: stripline, microstrip, coaxial, waveguide, twisted-pair, will give totally different phase shift. On top of this, the same length transmission line made on the same approach (stripline, microstrip, coaxial, etc) would give different phase shift (...)
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.
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 iron b
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?
A horn antenna is an extension of a rectangular waveguide. To feed the waveguide from a coaxial line you need a transition. Any good connector can be used, SMAs are good om DC to ~18 GHz. \Designing a waveguide-to-coaxial transition is a complex task. This is why empirical designs are used, and a careful adjustment is needed. All that (...)
Hi guys, I am trying to feed a microstrip patch antenna with a coaxial probe feed. Till now I m getting nothing although I have read the circular patch antenna tutorial provided in the help manual. Could anyone please suggest the correct method. I am using CST MWS.
make a coaxial line for antenna and then feed it with wave port see patch example of CST
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: S11=1/3+
Resonator Q determines the line width of the oscillator and its noise, too. This is why a high-Q resonators in oscillators are often YIG or dielectric resonators. Their coupling can be optimized easier than with a fixed stripline or coaxial resonator.
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
from An RF choke can be used in place of a balun. If a coil is made using coaxial cable near to the feed point of a balanced antenna, then the RF current that flows on the outer surface of the coaxial cable can be attenuated. One way of doing this would be to pass the cable through a ferrite toroid.(Straw 2005,
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 =1/2fmax w
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.
use :- Macros> Calculate> Calculate analytical line impedance> coax You can take the values required:- D=2.82mm d=0.5mm er=4.3(FR4) Zo=50.02 ohms
well, if u look at a system that hooks up to an outdoors antenna, u will likely find lightning protection circuits. Luckily microwave frequencies pass thru very small capacitances, so the first line of defense is a small series capacitor (maybe 5 pF) and a really good low ohm return path to earth ground from the coaxial cable shield. After that
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[/
You should measure the impedance of your antenna, then design a matched feed from a 50 Ohm line. You have certainly done that if you measured RL. Apparently your balun is not matched over the wide band. BTW, the correct name of a "spiral" antenna is HELICAL. What is the balun for? Helicals are matched to coaxial lines, no balancing needed.
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..???
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
These are coaxial Resonators and they can be inqiured from-for instance- There are other Advanced Dielectric Materials manufacturer, search google.
Please i need help :( I need to Know How to Simulate This coaxial Cable On this Antenna with HFSS need to Know the steps ,...step by step ,..and the Coax. Geometry It's Urgent Please Any One 89381
Hello! How to calculate coax to CPW adapter with a VSWR <1.1 ? project R1, R2 = 100 Ohm coaxial line 7/3.04 mm what I do incorrectly ?
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 (...)
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 line without causing mismatch. (...)
I have modeled a microstrip rectangular patch antenna with coaxial feed, if that's what you're looking for I can upload it... Let me know
how can i design impedance tuner locate smith chart anywhere . In addition to use coaxial line Stretcher module. because my company did not have stretcher. so i hope it can achieve by circuit. thanks
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
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...
The feed should be made with a delay section of the feed line. Consult e.g. the ARRL Radio Amateur's Handbook or ARRL Antenna Handbook for details. In principle the delay section is a quarter-wave long feed line. As coaxial cables have a dielectric inside, you should use the "shortening" factor available from cable specifications.
I have a test board that has a TI reference design for a Lattice type balun (see attached). The lattice balun on one side is assumed to be matched to the cc2540 at 70 +30j (obtained from TI's spec sheet). And the other side of the lattice balun is assumed to be matched to 50 ohms (obtained from TI's spec sheet). What I want to do is measure the
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.
Hi, I would like to simulate a microstrip in CST. 82964 On one side of microstrip there is coaxial cable, it's cooper core will touch the line. In the end of the coaxial cable will be lumped port between core and the end of cable (shield with pec). On the second side of microstrip will be also lumped port. Which solver shal
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 (...)
Maybe your method can work but you can use a 30-cm long coaxial line to get one ns delay. If your coaxial line is filled with a dielectric like in cables, the "shortening" coefficient should be applied. You will need less than 30 cm (usually 0.65...0.85) of a coaxial cable for it. You can cascade several (...)
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 the diam
Lots. With analog phase detector, you basically split the signal into two paths. One path goes to one port of the phase detector. the other path goes thru some frequency dependent structure (LC resonator, coaxial delay line, etc) to impart a phase shift that changes with frequency. You send that phase shifted 2nd signal to the other port of the
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 transformer with 1:5 windings ratio (...)
Hi, is there any example of coaxial feed for patch antenna in ADS2009? The microstrip line feed is general ,coaxial feed on the bottom ground layer is not very known. thanks.
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
Hi. I have simulated the patch with dimension W 25.84mm, L 19.78mm, which is fed by coaxial probe, and have obtained next I assume, that need to change dimension of the feed line and width of patch.
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 waves (that cause (...)
you seem to be confusing 2 concepts. If you have a symmetrical transmission line cross-section, such as coaxial cable, then you skin depth understanding applies. The RF currents on the center conductor, for instance, are mostly on the surface, with just a small portion going deeper. So if you are fabrcating your own coaxial (...)
Hello, Normally spoken a transmission line is to transport "energy" from one place to another (for example from the antenna to the receiver). So it normally does not radiate nor receive. This means the center conductor current equals the current at the inside of the screen, but with opposite phase. Outside the coaxial cable, the field of the ce
hi all I have designes coaxial cable fed,microstrip line fed and aperture c oupled microstrip patch antennas give me hints to design coplanar wavwguide feed microstrip antenna basically i require steps to design caplanar waveguide feed in msa:-) regards kartik
coaxial cables and microstrip lines are operating in TEM mode, which involves no cut-off frequency. Z0 exists for all frequencies, but as cmontoya mentioned, you possibly don't see much transmission line specfic effects.
Hi all, I have to design a power combiner narrow band (f0=200MHz ; Δf=10MHz ) capable of about 6kW output and 6 input ports. The idea is to have a central coaxial feeder a radial transmission line and n (6 in this case) N type 50Ω connectors. I have got some problems in simulating the radial transmission line. Should the (...)
Hi All Background: I need to use low speed phone line modem chip (cmx868) to communicate over dedicated 25,000 feet long coaxial cable. I have already tested it over balance line simulator (RC ladder circuit) for similar length. For that test I used Midcom 82111 line matching transformer which is designed for balance (...)