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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.
Hi, after calculating the trace width for 50 Ohm impedance line, the width is 0.30 mm. 116585 There is no problem at traces but on QFN pins which have a limited spacing, could RF traces have a neck near to SMT pins without affecting too much to RF line impedance? So, RF traces fit in a prope
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
Dear Sir, Can you explain me, what is near field and far field in electromagnetics.
Hello All, I want to know does testing the far-field measurement of an antenna in a near-field anechoic chamber gets effected or not? For example if i am getting a gain of 8dB in simulated far-field results, will the measured gain be effected if it's tested in a near-field anechoic chamber instead of (...)
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
Hi, What happens if the sub-relfector is in the near of antenna's main feed in a dual-reflector antennas? As feeds are normally electrically large, their farfield distance is quite large! and What is the solution? Cheers, Hadi
When I measure near field using a near field probe from antenna, PCB, ICs etc. (simply H-probe). I can see some peaks through Spectrum Analyzer(SA) according to clock frequency (in case of digital ICs). By the way, if the measured field is reactive field it may not be harmful as a EMI source because the field will be bounded near the (...)
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
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.