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17 Threads found on Focal Point
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
The key understanding to very high gain on parabolic reflectors is the sensitivity to error in curvature and focal point error of the the sensor element effectively limit that maximum efficiency of the antenna. You ought to do a sensitivity analysis for surface roughness and shape error with the sum of all points in error. You need extreme (...)
the lens is made of Germanium with inner diameter of 37.5 cm and outer diameter of 31.19 cm You really mean cm? Is it mm? Apart of this point, it would be interesting to know the lenses focal length and the geometry of your setup. To give a general answer not depending on detail informaton: The sensor calibration is assuming no o
Can you add a virtual focal point in the design as a fiducial point for reference?
I have a question if anybody can help me with I use a laser diode together with an integration rod to make the light intensity more uniform. Should the beam of the laser diode be converging to or diverging away from the focal point at the input of the integration rod? Is there a difference between the two? Thanks
Hello All, Im looking to find some in depth technical information maybe a datasheet for the FT 5302 capacitive touch panel controller IC's. Im having a hard time and if anyone can point me in the right direction that would be faboulus. they are by focal Tech Thanks, Zay
Hi, I am just wondering how I can observe the optical property in the focal region using the FDTD method because I don't know what's the focusing plane in the calculating area. If a point source is a stimulus, what's the code for this case? I saw a plane wave is always used for the simulation. Thanks!
What frequency ? 10Hz, 10KHz, 10MHz, 10GHz ?? A parabolic dish is just that, a parabola. You put the 'listening' device, microphone or antenna at its focal point. The rest is just an amplifier. Brian.
Yes, you can use the C/Ku dish antenna for S-band, just replacing the feedhorn, and keep the same focal point.
You have basigally lost the focal point of the dish, either because the dish is bended or because the focal point is misalligned. see the next articles to help you determine it again. Also check polarizat
You dont need software to create parablic curve on surface. You will need a string that will not stretch, marking tool, straight stick, 90?ruler , few screws. Blue line on diagram is your string fixed at focal point F and corner of 90?ruler, Q point. L is your straight stick fixed firmly on the surface. Marker is inserted in P (...)
Fisrt you must selecta frequency (6/4GHz) Then you must design the parabolic reflector using equation and then you must find the focal point of that dish And finaly the feeder antenna followed by the transeiver must fixed to focal point of the dish. That is the basic construction of the parabolic reflector antenna You (...)
ok suced assume u have horn as feeder,ok as u make offset reflector,u ask about where i could set the feeder.that is ur question? if yes it so easy,in cst after u simulate the feeder alone,in farfield pattern calculation ,choose phase center in its option u will see the location from the feeder port where u should locate the feeder above the fo
Aren't depth and diameter of the dish enough for getting the focal distance? EDIT: like this
Hi, The starin is not only that the focal length is fixed . But it is also that it is within the minimal limit say 30cm for an average man. Secondly the Gamma or brightness of the monitor is an issue. If it matches with the ambience light then there is a strain in the eye because of foreground mixing with background. IT SHOULD BE SLIGHTLY GREAT
Hi, is there a very simple program or calculation model for parabolic dishes? Basically to calculate the curvature/focal point and so on... I would appreciate any comments you guys might have... THANKS!!!
About the 1/d^2 law, let think in optics. The power density (measured in W/m^2) decreases as 1/d^2 along a beam, where d is measured from the focal point (a point from which the beams adjacent to the current beam seem to come from). But the total power picked by your receiving antenna is the integral of that power density over its (...)