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247 Threads found on edaboard.com: Reflector
There are a number of excellent books on the subject to get started with a general design. The demands that a reflector on a processor are significant so unless you have a relatively large computer and the appropriate variations on the software (FE-BI in particular) HFSS may not be the best tool. Look into TICRA as an alternate.
i am planning to design a VSAT antenna.... i managed to make a horn antenna....now just need to add a reflector in front of this....Please can anyone describe me the geometry of Paraboic shape in CST? or what kind of extrude curve i have to use....this must be a great help for my personal projects. only the physical reflector design i am searching
Hai everyone can anyone tell me how and where we can get the mathematical equations for the antenna design.We will design a different types of antenna can we get the mathematical support for everything like length width distance between the reflector plates and the antenna for dipole the gap between the two dipoles like that???
Its a real pain to maintain parabaloidal reflector at proper proportions and at the same time providing proper flare. I have found flaring easier than and reflector cumbersome perhaps there is a cheat way to set a flare up to have a reflector (parabaloidal) reflect low frequencies despite its inadequate dimension?
Can you help me to design a Reconfigurable Frequency Selective reflector in is fed by the monopole antenna and the FSR plates are made up of copper.FSR acts as a reflector when the switch is ON and it acts as a transparent when the switch is OFF.For this i want some formulas like how to calculate impedence for the FSR and what should be the
Could you please let us know more about the Frequency Selective reflector? Is it FSS layers beneath a planar monopole antenna?
Hi All, I need to design 36" x 9" in cassegrain configuration operating in E-band (Narrow bandwidth). I know how to design regular casssegrain but in this case I'm worry about the horn/sub-reflector blockages. Is splash plate design possible for proper illumination for that fan beam? It would be great if I can remove the spa
You just design an antenna having a 120 degree azimuth beamwidth and plot its pattern the same way you plotted the unidirectional antenna. Typically these are v-pol colinear arrays with a reflector. You could use image theory to calculate point source phases and locations to obtain the azimuth array factor.
With FEKO Lite you're stuck with the 500 triangles. To do a reflector antenna you'll need the full version, or you can try GRASP. There's a student edition that's free. I personally haven't used it so I won't be able to be any help, but a colleague of mine speaks highly
Hello I designed a simple corner reflector with HFSS and I set terminal impedance to 75 ohm.Here is my Hfss output S11 and input impedance of my antenna. 126392 (So at F=8 Gighz we have S11=Gama=10^(-10.7358/20)=.2905 126393 (as you see at the F=8Ghz image part is approximately around 0 and so w
I have a horn antenna working at 144GHz with A=12mm and B=14mm. Then I'll illuminate a satellite dish of 57cm diameter with this antenna, with the feed located at the focal point of the parabola. I have the radiation pattern of the horn, made with MATLAB. The goal is to know the beam propagation (power radiation) pattern of the parabola in the far
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 anyone say what possibly could be done to
What would be more correct for calculations: 1) connecting two antennas centers with point reflector using non-parallel lines or 2) connecting two antenna centers with point reflector Z-position using parallel lines (so the second line does not ends exactly on point reflector, but altered in Y-direction by antenna distance) or 3) (...)
In the project manager look for the reflector antenna icon ...... make sure you have set up a far field sphere to calculate radiation patterns in the first place. that plus the information above.
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Use several good Toshiba or Cree 1W or 3W LED and heatsink then drive with Thermistor to regulate Logic level <=50mOhm Nch MOSFET with drain to cathode LED and epoxy thermistor to heatsink for 50'C to adjust 1V gate voltage from 3.7V LiPo. If you dont know how to design an LED heatsink, buy one with heatsink and reflector. LED should be 2.85V @
I concur with Bigdogguru. Depending on where it is fitted, and whether you can live with it being slightly directional (more than it already is), you might be able to use it as the active element in a short Yagi antenna. In other words, fit a reflector behind it and one or more director elements in front of it. Something along the lines of a TV ant
Hi I want simulation the cassegrain reflector antenna with feko. when i run ke simulation i have this problem,ERROR 36728: Internal FEKO error. Please notify the FEKO support team and provide the error number, preferably together with the FEKO input and output files. please help me how can i solve it?
I want simulation a cassegrain reflector antenna with feko and get radiation pattern of it.
I want to simulate the plate as a reflector (by placing horn in front of plate) Assign a waveport excitation the the waveguide feed of the horn. Place the horn and the pate in a vacuum, where the edges of the vacuum box are at least a quarter wavelength away from the horn and plate. Assign a radiation boundary
Hello everyone, I'm looking at how to make a dual pol feeder with decent separation for 5-6ghz band, the classic tube with dipoles would be ok, but I dont know how to do sizing/reflector for the outer dipole. I'm also open to different designs, like cassegrain or exposed dipoles with reflector. best regards, Giacomo.
Ultrasonic transmission requires both TX and RX transducers to resonate at the same frequency. Try adding variable capacitor (10-300 pF) in parallel with one transducer, if no improvement, then to the other. Use a parabolic reflector on one or both sides to increase directivity. Try checking the waveform with an oscilloscope before the amplifier
I know the FFT transformation between the aperture distribution and the UV plane. But when I use the matlab command 'ifftshift(ifft2(T_uv))', the aperture distribution is skew. The number of sample point is even. I don't know it is correct when I direct use the command. Thank you very much for your help. [ATTACH=CONFI
well, the simple answer is: they don't emit at a single frequency! Look at the spectrum of a standard laser diode..you will see a hump of frequencies! Only (in semiconductor lasers) if you use distributed feedback type (i.e. have a bandpass filter type of reflector mirror) will you get MOST of the energy in one spectral line.
I believe the Iron Mountains exist in Tolkiens Middle-Earth but not on our planet. A medium wave antenna tower uses in fact the earth surface as ground plane respectively a reflector. In so far the idea isn't particularly new.
To replace a Parabolic reflector Antenna (at around 14 GHz) with its equivalent Pattern. The pattern shape is given (peak gain, SLL etc.). I have to create the exact pattern manually from scratch. Since the Gain pattern information is available, it is easy, i suppose, to create the pattern instead of designing an antenna that gives me the exact s
Monopole antennas are a simplified arrangement of a dipole, which employs on base some reflector apparatus to reflect on it the radiation generated from the upper rod, so that the resultant radiation pattern viewed by remote receiver looks almost as becoming from a dipole. as illustrated on this
Range is a 4th order path loss from 2 directions, so CW requires huge Tx rejection by directional coupler and tracking notch filter in DSP of the IF signal. Burst mode wavelet has significant advantage in CNR or SNR result by time multiplexing Tx & Rx. Range is always time delay of burst or phase shift of CW of a stationary reflector, which c
Is the motor which rotates the reflector in a rotating warning beacon likely to be a stepper motor? ..or would a stepper motor never be used for a constantly rotating usage due to the non-smooth torque?
Hi anyone. I'm trying to simulate a parabolic reflector antenna with horn feed in FEKO.I want to solve this problem with MLFMM method.but when I run, this error appears: FMM and PO are not allowed in the same model! Help!
I want to perform TRL calibration for free space dielectric measurements. Consider the two antennas that are 30cm apart. I am confused i) THRU:: now do i need to set "zero length delay" in VNA calibration kit (i.e. default setting in VNA). Or i need to set delay corresponding to 30cm. ii) REFLECT:: since the reflector will be place at the
Hello, I am looking for antennas for vehicule traking. In fact, the antennes will be stuck with magnetic under the vehicule. For GPS antenna (patch), there is no problem, i think, as it has his own ground plane but for GSM900 antenna, there is a problem. Indeed, to preserve a good S11, the reflector should be at lambda/4 and it is equal approximat
hi guys.. what happens to the feed resistance of an antenna when the reflector and the director are placed on either side of a dipole? it generally lowers the feedpoint impedance what happens to the beamwidth when the number of directors are increased? it narrows what is the app
Let's see a simple qualitative way to see that a reflector can affect the feeder. Let's consider feeder and a reflector consisting of an infinite perfect conductive plane. Then, by the method of images, the plane can be substituted by the image of the feed. In far or near-field, this image has an interaction with the original feeder, dependent of t
Hi, I have a question regarding the Bandwidth limitation of reflector antennas. I want to design a reflector antenna from 2 to 5 GHz which is quite wide bandwidth. I think the dish can be designed for such a bandwidth, but can I also design a normal feed? Which type of reflector antenna is better to be used primary of secondary focus? (...)
Hi all I need to FDTD code for corner reflector antenna.can anyone help me?? please connect with me by
1) Best software for simulating it? 2) I simulate my designed structure with CST MWS (integral eq. solver) but the gain is very bad. For a dish of 120 cm the gain is less than 15-16 dB and I think this is very low. What mistake did make? feed is a 6-turn helix antenna.(freq. band 1.1-1.7 GHz)
I don't know the effect of material constructing metal reflector it could make from: - copper - aluminum - Steel - Iron I don't want to mention on mechanical characteristic. What kind of material should use?
With a traditional Yagi aerial, stubs in front of the actual dipole are called directors, those BEHIND the dipole are called reflectors. they increase the forwards directivity and reduce the pick up from behind the dipole. Frank
how to design a co planar stripeline feed and integrate it to dipole antenna with reflector?. i have designed the antenna but it is showing a VSWR of 3 instead of 2 . need assistance for design and integration. impedance is 150 ohm and hence need to design the width of the feed and gap of the feed to the dipole antenna ant to integrate.
The beamwidth of a reflector antenna may be varied by de-focusing the feed. For small de-focusing values the antenna gain it will not change as much as the beamwidth.
Hi, do you know what does "torus reflector antenna" mean? I can not find regular information. Thank!
I don't think that the current flow will be through the reflector. 13 kHz is a rather low frequency with about 0.5 mm skin depth for copper.
Then why corner reflector called so? Or a satellite dish made of metal grid. its called a corner reflector cuz it has a corner angle bend in the reflector, commonly 60 or 90 degrees the vertical height of the reflector is usually a bit larger than the length of the radiating element. The length of the sid
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 (...)
Heh... *surely* with this revised subject line you'll shake some FEKO experts out of the woodwork to help! :) With my (marginal) background of RCS and my (non-existent) experience with FEKO, the first thought that springs to mind is that the diffraction effects you're seeing are entirely explicable if you're illuminating the reflector with a plane
Hello! My task is to simulate trihedral corner reflector using Feko, to build backscattered field and to calculate RCS of that one. But I am not experienced user, so I have started with simulation of one metal plane. As a source I have chosen a plane wave. I have made this model in both CADFeko and EDITFeko, BUT(!) when I ran POSTFeko, I have seen
Hi , I am doing my Thesis at design speed calibrator of doppler radar speed meter I need to verificate the reflector antenna spec.(the speed meter antenna) with software simulator (CST) but the CST software dosen't inculde this antenna model . Can some one post a Appropriate code at CST for parabolic reflector antenna :-P Thanks
Hi I want to know the differences between scattering electromagnetic waves from common reflector antenna and the grid one(grid reflector antenna) Is it possible to have the same RCS? thanks
Adding to that, if you investigate how LCDs work you will understand that they (at least 'normal' LCDs) use the angle of light in conjunction with polarized filters and a reflector to create the dot/segment shapes. As you move away from the optimum viewing angle, the reflected light becomes more subject to blockage through the polarizing filter an