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147 Threads found on edaboard.com: Near Far
both near field and far filed will work
I only see the Antenna Parameters (like power radiated, power incident, power accepted, etc...) for far Field. It does not do it in near Field, why? Impractical? Thanks.
there is always a comparison between near and far field measurement system. How much does a spherical or cylindrical near field system cost. thanks
Hi, I'm working on a nearField to farfield (planar scanning) code in matlab. I have just tried to test this code on an easy structure (open-ended waveguide) but the radiation pattern is different from that obtained using literature equation. Does someone know a working script to implement the NF2FF planar transformation ?
1) What's the difference between omnidirectional antenna and the normal UHF antenna? What I know is there are 2types of antenna in RFID implementation; linear polarized and circular polarized. Does omnidirectional refers to circular type antenna? 2) Is the calculation for EIRP / ERP the same for linear and circular polarized antenna? 3) (...)
Hello everyone, I'm using FEKO 5.4 and would like to determine the distance where the near-field converges to the far-field within a certain tolerance. I'm having a bit of difficulty in figuring out how to implement this entirely in FEKO. From what I can tell, I can't even subtract the near-fields from the far-fields in (...)
Now depends in what kind of near-field you are. For example in Reactive near field the Electric-E and Magnetic-H fields are not orthogonal, and polarization is not a meaningful parameter. Myself, I would go in the far field to measure the polarization of the antenna.
near means it is within the same segment while far means it is in another segment.
Hi guys, My question is for a far-band simualtion by hfss, hou should i set the soluaiton frequency? e.g, my filter's Center frequency is 5Ghz (BW 0.5Ghz), so for the in/near-band simulaiton, my soluaiton freqeuncy is set to 5Ghz. If I want to simulate a far-band response from 20~25Ghz, should I still keep the same soluaiton (...)
The whole complication with near field analysis is that you have a radial component to your fields rather than just the typical far field "TEM". So, indeed your near field plots will be a function of the size of your near field sphere. I would use the near field radius that you plan to measure for (...)
hello everyone presently i am doing layout. i heard the CDM SHOULD BE near TO TRANSISTOR.Can anyone help me regarding this? regards siddu.
hi all, Now I design an integrated dipole antenna (CMOS process). I wanna find a tutorial or lecture for measuring integrated antenna by converting near field to far field. Any one please help me!!!
Hi, I want to find the radar cross section for an object. I set the excitation to a planewave excitation but the problem is that I do not know where I should put it. Should it be in the far field or near field of the object. Does this incident field impact the RCS? Thanks
Just search the net for "Antenna near Field" and you will get thousands of answers. Have to think to the antenna coupling, the same situation when you have two coupled LC resonators (some RF basics), because an antenna basically is an LC resonant circuit. More or less cou
Lets say I have two monopole antennas in a WLAN receiver at 2.4 GHz, and they are spaced 10" apart. How far away would I have to put a test antenna to be out of the near field so that I can effectively test the mimo algorithms beamforming capability? Added after 1 hours 43 minutes: Let me re-phrase tha
Hi Girly_girl, The same adaptive algorithms, for example Normailzed LMS (NLMS). For hybrid echo (I assume you are speaking about near line echo) the impulse response is shorter than acoustic echo, then the filter length can be shorter and convergence is easier. In the case of far line echo, the delay can be quite long and requires long lines a
the singnal transmitted is orthogonal to each other, so there is no near far effect ,also there no need fast Transmission Power Control
Dear all, I simulating a horn antenna in CST. I'd like to see the transition from near field to far field. Does anybody know how to do this? many thanks, wlcsp
Hi Girly_girl, Practical applications in telephony are: a) Line echo cancellers: for cancellation of near- and far-end echo in telephone links (don't confuse with echo suppressors). There are ITU-T reccomendations in series G (ITU-T G.168 and others) that specify them. b) Acoustic echo cancellers: for use in speakerphones. Regards Z
Have no materials about 2D case, but for 3D MoM solution you might be interested to take a look for this application note: Modeling Of Electronic Devices Using near Field Sources