247 Threads found on edaboard.com: Reflector
Hi all :D
My professor give me a project to design a paraboloid reflector but he only show me the picture of that dish and gain at 30db,solution freq at 3GHz,the pic look like it's the front feed type
I'm new to antenna design,i started with microstrip patch array and still have work on this prj
I don't know how to design that paraboloid antenn
RF, Microwave, Antennas and Optics :: 11-10-2016 16:12 :: BlakIce :: Replies: 3 :: Views: 499
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
Electromagnetic Design and Simulation :: 11-13-2016 21:52 :: Ayasink :: Replies: 1 :: Views: 650
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???
Electromagnetic Design and Simulation :: 09-24-2016 04:46 :: rajarani :: Replies: 1 :: Views: 470
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?
RF, Microwave, Antennas and Optics :: 09-25-2016 07:07 :: Zak28 :: Replies: 0 :: Views: 423
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
Electromagnetic Design and Simulation :: 08-26-2016 08:12 :: rajarani :: Replies: 0 :: Views: 291
Could you please let us know more about the Frequency Selective reflector?
Is it FSS layers beneath a planar monopole antenna?
Electromagnetic Design and Simulation :: 08-18-2016 08:18 :: Chao Gu :: Replies: 2 :: Views: 402
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
RF, Microwave, Antennas and Optics :: 06-04-2016 13:03 :: jiripolivka :: Replies: 2 :: Views: 468
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.
Electromagnetic Design and Simulation :: 05-01-2016 01:33 :: AA1LL :: Replies: 1 :: Views: 543
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
Electromagnetic Design and Simulation :: 03-22-2016 04:37 :: dr_em :: Replies: 1 :: Views: 529
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.
(So at F=8 Gighz we have S11=Gama=10^(-10.7358/20)=.2905
(as you see at the F=8Ghz image part is approximately around 0 and so w
RF, Microwave, Antennas and Optics :: 02-25-2016 21:07 :: baby_1 :: Replies: 0 :: Views: 680
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
RF, Microwave, Antennas and Optics :: 02-25-2016 14:24 :: Gilda :: Replies: 0 :: Views: 539
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
Electromagnetic Design and Simulation :: 01-30-2016 07:45 :: farhanahmed :: Replies: 0 :: Views: 358
What would be more correct for calculations:
1) connecting two antennas centers with point reflector using non-parallel lines
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)
RF, Microwave, Antennas and Optics :: 01-05-2016 06:09 :: Terminator3 :: Replies: 0 :: Views: 457
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.
RF, Microwave, Antennas and Optics :: 10-28-2015 22:01 :: Azulykit :: Replies: 4 :: Views: 606
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For Sale: :: 09-02-2015 07:23 :: Ivy91 :: Replies: 0 :: Views: 161
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 @
Hobby Circuits and Small Projects Problems :: 08-24-2015 23:36 :: SunnySkyguy :: Replies: 2 :: Views: 936
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
RF, Microwave, Antennas and Optics :: 07-04-2015 08:06 :: betwixt :: Replies: 4 :: Views: 535
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?
Electromagnetic Design and Simulation :: 03-15-2015 06:46 :: Roxana bagheri :: Replies: 0 :: Views: 487
I want simulation a cassegrain reflector antenna with feko and get radiation pattern of it.
RF, Microwave, Antennas and Optics :: 03-11-2015 07:07 :: Roxana bagheri :: Replies: 3 :: Views: 2141
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
Electromagnetic Design and Simulation :: 02-02-2015 19:38 :: PlanarMetamaterials :: Replies: 5 :: Views: 1173
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.
RF, Microwave, Antennas and Optics :: 01-23-2015 08:55 :: deffie :: Replies: 0 :: Views: 468
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
Analog Circuit Design :: 12-25-2014 18:10 :: jiripolivka :: Replies: 1 :: Views: 584
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.
RF, Microwave, Antennas and Optics :: 12-17-2014 03:14 :: mati1985 :: Replies: 0 :: Views: 444
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.
RF, Microwave, Antennas and Optics :: 12-05-2014 19:38 :: biff44 :: Replies: 1 :: Views: 519
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.
RF, Microwave, Antennas and Optics :: 11-09-2014 18:01 :: FvM :: Replies: 2 :: Views: 511
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
Electromagnetic Design and Simulation :: 10-02-2014 20:46 :: asifrizwan :: Replies: 0 :: Views: 839
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
RF, Microwave, Antennas and Optics :: 08-03-2014 15:45 :: andre_teprom :: Replies: 3 :: Views: 633
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
Elementary Electronic Questions :: 08-01-2014 14:55 :: SunnySkyguy :: Replies: 11 :: Views: 1082
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?
Elementary Electronic Questions :: 07-12-2014 17:39 :: treez :: Replies: 24 :: Views: 1805
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!
RF, Microwave, Antennas and Optics :: 07-01-2014 14:16 :: beta3 :: Replies: 0 :: Views: 719
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
RF, Microwave, Antennas and Optics :: 06-13-2014 06:44 :: snkhan :: Replies: 2 :: Views: 659
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
RF, Microwave, Antennas and Optics :: 05-07-2014 08:38 :: LORDALEX :: Replies: 0 :: Views: 424
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?
what is the app
RF, Microwave, Antennas and Optics :: 05-05-2014 09:00 :: davenn :: Replies: 1 :: Views: 432
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
RF, Microwave, Antennas and Optics :: 04-09-2014 19:02 :: zorro :: Replies: 5 :: Views: 822
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? (...)
RF, Microwave, Antennas and Optics :: 02-13-2014 10:33 :: Hadi-Alik :: Replies: 0 :: Views: 467
I need to FDTD code for corner reflector antenna.can anyone help me??
please connect with me by
Electromagnetic Design and Simulation :: 01-01-2014 17:47 :: yaldarah :: Replies: 0 :: Views: 750
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)
Electromagnetic Design and Simulation :: 10-26-2013 20:01 :: smhosseini :: Replies: 0 :: Views: 505
For UHF to microwave region, any of metals you listed can be used. Corrosion can be prevented by paint or varnish.
Metal conductivity starts being important approx.above 100 GHz.
You can even try carbon-fiber composite board as a reflector, it works fine at ~10 GHz even having ~100 Ohms/square.
RF, Microwave, Antennas and Optics :: 09-25-2013 12:12 :: jiripolivka :: Replies: 2 :: Views: 482
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.
RF, Microwave, Antennas and Optics :: 09-21-2013 16:13 :: chuckey :: Replies: 1 :: Views: 592
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.
Electromagnetic Design and Simulation :: 09-07-2013 04:54 :: engineer nandhu :: Replies: 0 :: Views: 770
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.
RF, Microwave, Antennas and Optics :: 07-25-2013 12:34 :: vfone :: Replies: 9 :: Views: 845
do you know what does "torus reflector antenna" mean? I can not find regular information.
RF, Microwave, Antennas and Optics :: 06-07-2013 07:28 :: mauloftin :: Replies: 2 :: Views: 853
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.
Mathematics and Physics :: 05-29-2013 17:20 :: FvM :: Replies: 1 :: Views: 568
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
RF, Microwave, Antennas and Optics :: 04-08-2013 08:51 :: davenn :: Replies: 8 :: Views: 691
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 (...)
RF, Microwave, Antennas and Optics :: 03-28-2013 22:21 :: uri1636 :: Replies: 0 :: Views: 1020
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
Electromagnetic Design and Simulation :: 03-27-2013 00:12 :: thylacine1975 :: Replies: 2 :: Views: 747
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
Electromagnetic Design and Simulation :: 03-23-2013 22:16 :: Iskrinka :: Replies: 3 :: Views: 1175
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
RF, Microwave, Antennas and Optics :: 03-22-2013 19:15 :: uri1636 :: Replies: 0 :: Views: 657
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?
Electromagnetic Design and Simulation :: 02-22-2013 08:41 :: nematollahi :: Replies: 1 :: Views: 607
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
Elementary Electronic Questions :: 02-07-2013 19:34 :: betwixt :: Replies: 2 :: Views: 602