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220 Threads found on edaboard.com: Coaxial And Cable
coaxial cable characteristic impedance isn't a resistance and can't be only measured with special instruments. To distinguish between 50 and 75 ohm cables, look at the ratio of center conductor to dielectric diameter. It's around 3 for 50 ohms versus 6 for 75 ohms.
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
?surely the above thread is incorrect?..SMPS output ripple should best be measured with a x10 scope probe, and not a piece of coaxial cable which will be a 1:1 probe and will overly capacitively load the high frequency bit of the measured value? All that is needed is to remove the ?tail? at the end of
kindly share the method and the related calculation for the amplifiers matching using Co-axial cable and bond wire in case of high power amplifiers at VHF band.
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
Dear members, I am trying to simulate a conical antenna placed on a circular ground having a cut-out for the coaxial feed. The coax contains the Outer Cylinder (PEC), the inner Teflon and the innermost feed pin cylinder (PEC). The structure can be seen below; 128776 Can someone please assist me on how to excite the
If the frequency range is actually up to 36 GHz, the test port connectors of your network analyzer and available calibration sets will prescribe the useable cable connection. In case of doubt some semi-rigid type. You also need to design a coaxial-to-stripline transition.
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 (...)
Hello, I am farely new to HFSS and can't seem to circle my head around the problem of modeling components. For example let's say I have modeled a coaxial cable in HFSS with a shield and now want to make a component that will in Simplorer appear as black box with 2 inputs (1 input for the core and 1 for (...)
Hi all, suppose I want to make a 1:1 balun using a coaxial cable. So the primary would be the inner conductor, and the secondary, the outer conductor. The question is, how do I determine Zp0e and Z0o or the coupling coefficient based on the cable data? Is there a back-of-the-envelope calculation? (...)
Good Morning, I am facing an issue. I have modeled a coaxial cable and modeled as well one rectangular mirror or reflector inside the cable such that we can see dips in S(1.1) vs Freq. but the problem is after having first dip at 13 GHz, then the graph is distorting heavily and looks more like noise. Can (...)
Hello every one, I have a question regarding bidirectional transmission with RF and power in a coaxial cable. Is it possible to pass a RF signal from one end and a DC voltage from another end of a coaxial cable. I gone through the older posts before posting this question. Those responses (...)
Google broken? E.g.
Reminds me of the adapters that come with a Universal Laptop charger coaxial plugs with a multi-wire interface. One of the wires to the SMPS charger was voltage sense and Gnd sense to regulate voltage at point of entry for loss in the wires.(remote sense) I modified the cable so I could adjust the output of the 19.2V 65W supply with pot, (...)
Hi Lacrimosa, Look up the drawings for the connector you're going to use, and create the connector in HFSS. Then just excite the coaxial mode on the coax end of the connector.
I have a portable lithium ion battery pack that powers a LED headlight. It uses this cable. The headlight came with 4 cables, however 2 of them have already died, giving only a few months of use each. I know someone else who has gone through all 4 cables already. I am awaiting a response from the compa
Yes, this is the correct section! The connector is just there for the convenience of being able to attach or remove the cable. The 'shell' of the connector should be connected to the outer metal sheath of the coaxial cable with the pin passing through the middle being connected to the center wire. Yes, it can be used to connect for (...)
Hello. I am working a project with CST cable Studio for my university. I am new in the CST software and I would like to know how can I change the way the H-field is displayed. I would appreciate your help :)! I have this: 117879 and I would like to have a display like: 117878
I was watching videos about AM and FM on YouTube. I saw a video and can't find it now. In that video was a block diagram-like circuit. It was a physical, actual block circuit. All the blocks like LPF, VCO,BPF etc were built in little metal boxes and these boxes were connected to each other with a coaxial (...)
Hello everyone, I am trying to design a Microstrip Patch Antenna using HFSS and I need help regarding dimensions of coaxial cable to implement in HFSS. Can you tell me what are the standard connectors available in the market? I am from India and I have heard that not many connectors are available here. (...)
................... P.S my dipole is precisely 50 OHM and so is the coaxial cable so no need for impedance transformation. I only need to eliminate the coax shield currents. How did you achieve that ? ... dipoles are 75 Ohms by nature ( folded ones 300 Ohms) ... what impedance matching did you do ? Dave
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 (...)
cable-fed probes inserted into a wavguide space are familiar to many. They generally insert about half way into the shorter space, and can be variously given cylinder or conical end shapes. Even the centre conductor of a coax cable inserted like this can give 10dB RLR. Things get more awkward when trying to launch into the gap of a (...)
What determines the ideal coaxial cable impedance? The impedance of the RF coax cable is chiefly governed by the diameters of the inner and outer conductors. On top of this the dielectric constant of the material between the conductors of the RF coax cable has a bearing. The relationship needed to (...)
A good coaxial cable and connectors are best to reject ANY EMI/RFI at ANY frequency. If you can, use the semi-rigid cables with SMA connectors. Their sheath is full copper and SMA connectors offer >90 dB leakage rejection. BE ready that low-frequency stray signals rather enter not by the (...)
I want to locate and calculate the feed point for a 50 ohm coaxial cable to excite a multiband monopole structure. My antenna consist of a partial ground plane at the lowest layer. Followed by a Rogers 5880 substrate with er=2.2 as the second layer and the monopole structure as the final top layer. The (...)
If you decide for RG58 cable, you can buy a 2m BNC cable and cut it in the middle. Personally I would prefer RG174 or possibly RG178 (High temperature - "solder resistant"). But the cable type is rarely used for ready-made BNC patch cables. Some catalog distributors are still selling (...)
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 (...)
1/2 lambda length of the coaxial cable balun act as 4:1 for impedance, and 2:1 for voltage. 3/2 lambda may work, but you don't get 4:1 impedance ratio anymore. At 2.4 GHz I would recommend do not use a folded dipole for the driven element, because anyway the bandwidth of a standard 1/2 lambda dipole (~73 (...)
Quality of cables generally is ranked 1) Rigid, 2) Semi-rigid, 3) Flex where larger diameter and high quality core can reduce loss.but also much more expensive, so look at larger diameter flex coax. how would you rate RG316 cable? 50m @ 2.4GHz attenuation = 95dB Very Very Poor. PE-C600 Low Loss Flexible
I purchased a new crimping tool for crimping SMA connectors to RG-174/U cable. The tool can crimp to various other coaxial connectors (BNC, F, N TNC), and I've noticed that while the slot I use for crimping RG-174/U cable is hexagonal all the way through, the two larger slots are hexagonal most of the way, but at one end (...)
Hello I have a small active loop outdoors antenna and I power it up fro the same coaxial signal cable (phantom power supply). I need to find a way to also switch a relay at the antenna side using the same coaxial cable. At the beginning I was thinking of these "memory-pulse" latch relays. Any ideas?
Hi I wanted to design a microstrip rectangular patch antenna in 2.45 GHz.I chose the fellow dimension: h_sub=10mm epsilonr=2.2 Lp=34.23 Wp=48.4 L_GND=94.23 W_GND=108.4 I used coaxial cable(50 ohm) for feeding with: Rin=0.6 Rout=2.3*0.6 the prob was PEC and the coax is vacuume. But I do not know the position of feed (...)
Dears, I am simulating a kind of coaxial cable at CST MWS using TD and need to know losses in metalic walls and dielectric in all simulated band. I can see these losses in 1D Results/Power/Excitation but it is for just 1 frequency, that frequency specified to H monitors. Does someone know how to obtain (...)
For a sinus, reduced amplitude. A square-wave will most likely be distorted. Actual length of coaxial cable can affect result a lot.
Hi guys , I am trying to resonate a printed dipole antenna at 2.2 GHz. I am using coaxial cable to feed it from the bottom. Outer conductor of the coaxial cable is attached to the ground and the inner conductor is hitting the dipole antenna on the top of substrate. My problem is that antenna is not (...)
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?
you are getting spurious outputs. since you are applying identical RF signals (same amplitude and phase) to two ports of the mixer you should be getting a constant DC output voltage (assuming the rf levels are high enough to drive the mixer diodes). Try putting a time delay in one of the paths, like 10 feet of coaxial cable, sweep the (...)
Hi Preeti Rani! I hope this file help is a monopole antenna that is excited by a coaxial cable. you can use from it's coax section. *ghasem*
Hi , I am working on a Hobby project , I need to convert the coaxial input of a cable TV interface into digital signals and provide to a processor , Can anyone help me out with how to proceed with the project ?? Any links regarding the same will be of great help , Thank you .:-)
My coaxial cable often work with high power (ie 1KW), I've just measure cable loss by using VNA. But I wonder the value mesured by VNA is not correct because of low power input ( 20dBm). Do you know cable loss vs input power?
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. (...)
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[/
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'm studying the trasmission of signals though coaxial cable; I'm using a coaxial cable (of course!), an oscilloscope, a generator an some different endings. This is the scheme: I was told that if I use a very long cable that has impedence \$Z_0= 50 \Omega\$ and put, at the end of it, a (...)
hello, I have a 700tvlines camera module and wants to connect to a 960H distance between them is 80meter. which provides the best picture: a coaxial cable or cat5 cable with balun? friendly thanks jean paul
Hi Astrid You can have a look into RG series which are suitable for your purpose . ( for example RG5 ..... ) By the way don't say simply 100 watts ! power rating of a coaxial cable also depends on your frequency of operation ! for example it is possible that a cable can operate at 500 MHZ with power of 500 watt but that (...)
Pan-International Wire & cable (Malaysia) Sdn Bhd has become the specialist of wire & cable manufacturing for the telecommunication, computer, internet & multimedia industries in the global market. Our range of wire & cable products includes coaxial cable, Hook Up wire, Speaker wire, USB (...)
No, dimensions remain the same for different frequencies. In the lab you will always have the same coaxial cable with the same connector for your measurements, whatever the frequency of operation. That's to the best of my knowledge :) and I completely agree that your font size at the beginning is a bit too small, consider making it (...)
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.