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147 Threads found on edaboard.com: Near Far
Hello. I'm a new on this forum. I would like to show my last project. This is a device 3 in 1: bikecomputer + flashlight + powerbank Features: 1. Supply from two Li-Ion Cells 18650 Robiton 3400 mAh each 2. Embedded battery charger 3. Two bulbs. One has 10deg lens for far distance light. Other has 30deg lens for near distance light. Each bulb
as far as the 90 degree ends of the slots in the Comsol example. I would guess the total length of the slot, including the two tabs at the end, is approximately half wavelength, so that it resonates. Then the two 90 degree tabs are coupling energy from the waveguide (near those top edges of the waveguide are maximum current flow points).
The quoted equation is only valid in far field, 2 m is clearly near field. That's at least one possible explanation for deviation. For a more exact caluculation of transmission in near field, refer to antenna theory text books, e.g. Balanis.
What is your wavelength? In my experience a good absorber functions equally well in far or near field.
As far as the pole lies near a zero it will cancel out the effect of that pole.. it is correct. So i think it will cancel out one pole which is nearer to the Zero.
To achieve 0.3 mm trace width for 50 ohms on FR4, the substrate height must be about 180 ?m. Is it so? More usually, the feasible line width is far below that required for 50 ohms. So it's unavoidable to reduce tracks near a QFN pin. Consider that the bond wire inside the IC package neither continuous 50 ohms impedance. Traces shorter than &#
It depends on your specifications ! Is it white smoke or black smoke or invisible smoke ? Is this for alarm purposes or process control? is it far from camera? What is between and behind cam? IR is best source for detecting smoke optically, but does cam have IR blocking filter? Do you want to measure smoke near ground? or high up? Is this for i
I had simulated micro patch antenna for 2.4 ghz and I can find s11 but please explain procedures to find other results like far feild radiation, near feild,efficiency,gain,directivity and all parameters
I fear your latest posts are further confusing your intentions. In terms of RF engineering, an antenna is a device with non-zero coupling to far-field. Inductive couplers are designed to receive or generate a magnetic near-field. They are used in a kHz to multiple 10 MHz range to transmit data or power wirelessly. They can be described as AC mag
Dear forum, I would like to do a sanity check on a near-field to far-field transform problem that I am struggling with. I have some planar recorded near-field data and would like to transform these data to far-field data and subsequently depict the field in spherical coordinates as E(r, theta, phi) where r is the radius, (...)
Some reservations: The LCRC model represents the transducer near it's resonance frequency, but not far from fundamental resonance frequency or e.g. overtone resonances. The "R" parameter respresents the sum of internal losses and external energy transfer, so it's supposed to change with the load conditions like interfacing the transducer with di
Hi narayani, For simple static charges, there is no propagation, and the above definitions don't really apply (lambda -> infinity). Therefore, we typically say that there is no far-field region, and everything behaves like the near field.
there ARE ways to do a reasonable far field measurement in a near field chamber. There are plenty of published papers on the method.
Hallo, i am currently working on a macro for cst mws and i am in search of sample cst source data. For example i need a.fsm or .rsd file for source fields(near/far). i need these file to do a debug run of my macro. thanks in advance rahul
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
In reactive near field the electric and magnetic fields are not orthogonal and any object placed in this region will distort the antenna pattern. This is one clue that could give information where this field stops when moving far from the antenna. For doing this, have to do a far-field antenna pattern measurements, before and after placing (...)
I've never heard of P.I.C. before but I can tell you all landline modems use echo cancellation training with test patterns to cancel near and far end echoes. WiFi on the other hand gets cancellation from any transmitter that echoes off walls with a cancellation effect called Rician Fading or Rice Fading. This can generate a null when an echo is e
im simulating a spiral receiving antenna in freq. range 2-18Ghz. the antenna is placed closed to several metal conductors, and i want to simulate the radiation pattern of antenna. i want to know which one of the closed materials(metals) should be considered in simulation. i mean if we want to neglect some conductors near the antenna , how much it
That's a nice picture. :) And now for something completely different: have you got an architectural diagram of the algorithm of how it will look in an FPGA? if not - drawing this is a good place to start before you even go anywhere near VHDL.
The radiated power of a small magnetical "antenna" at 24 Hz into free space (= far field) will be effectively zero. I guess, you are rather interested in the magnetical near field. It's proportional to Ampere-turns multiply coil area.