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153 Threads found on Coaxial Line
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 capacitor etc. ADS and other (...)
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!
Hi I am working on point to point communication system over dedicated coaxial cable. Required Data rate = 100kbps cable length = 5km I am looking for suggestion/design ideas In one of my previous projects I used wire line modem (CMX866) successfully over similar distance but baud rate was 2400. Can I use two DSL modem ICs for such c
Hello, I am using HFSS V13,and simulating a Planer Inverted F antenna with coaxial feed line.Validation check is successful.But no result found in s11 plot.I attached the view of design.Anyone can help me please?
Hi I'm experimenting with power line communication by connecting 2 modems (Texas Instuments PLC developer's kits) through 100m of RG58 coaxial cable as a model power line and injecting white gaussian noise with a signal generator. The modems exchange modulated packets of data shown in fig 1. I was hoping to see the response of the Bit (...)
I have designed a 10 element LPDA and I want to achieve around 6-7dB of gain but I am getting an issue with the gain plot (see attached). It looks like there is some null on the PHI axis. I am feeding the antenna with a coaxial line and a lumped port at the end. I honestly have no idea why it is doing that... Hope someone on here can shed some ligh
You can try a "bias tee" solution, i.e. capacitor for the high frequency path and inductor for the low frequency /DC path. The task is fully possible. Satellite TV receivers are connected to LNBs in antenna by one IF coaxilal line. It feeds +15...20 V DC to the LNB, 22 kHz oscillator-switching signal, an
How to make coaxial probe for horn antenna in feko. In feko example of horn with line feed i changed parameters and have achieved my desired results now i want to place probe like in hfss Microstrip patch antenna but i have no infinite ground in case of horn. Kindly mention steps and tell me how to know what will be inner and outer diameter for pr
when there is a probe it come with coaxial transmission line too. and its clear how to excite coaxial line with voltage source
Hello, I have a coaxial line of length L. run it at frequency f. No dielectric just one PEC cylinder in a vacuum cylinder. Defined waveguide ports. since this is a TEM mode, I would expect the s21 phase to be 2*pi*L/wl. It's not! What am I missing? Thanks
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 and vice-versa. (...)
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
I can see you have no knowledge about the problem. 2 GHz corresponds to 15 cm wave length, so your device should achieve 180 degrees phase shift by adding or removing 7.5 cm to the transmission line. You can do it mechanically by making a coaxial line extender, or, by switching line sections . You have not specified if your (...)
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..???
hi. How can I calculate the length of patch for matching microstrip patch line of width 2mm with a characteristic impedance of 100 ohm,to a coaxial line with a characteristic impedance of 50 ohm?
These are coaxial Resonators and they can be inqiured from-for instance- There are other Advanced Dielectric Materials manufacturer, search google.
Hi Ahmed, The illustration isn't very clear, it doesn't seem normal having a coaxial cable lying flat on the ground plane! Or is the gray part your substrate (in that case I would assume the feed is a microstrip line, not a coaxial probe). Anyways the antenna structure you have looks like an IFA (Inverted F-shaped Antenna). I'm designing (...)
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.
1. you could make the balun with just one inch of 50 ohm coax cable. at one side shield and center wire is the differential input and other side the center wire is single ended output if the shield is connected to ground. it is a simple transmition line transformer. it is recommended to use the thinnest coaxial cable available to reduce parasitic e
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