Inside Wireless: Antenna Gain

[@Rfelements]

DO you have topics from RF world you want to learn about? Let us know in the comments!

[@albertohdezmx]

Yes, want to know what hardware and software we need to make comparison of 2 dipole antennas

[@Rfelements]

@@albertohdezmx what parameters of the antennas you want to compare?

[@ImRanz25]

Can Height of antenna can affect the gain ?

[@Rfelements]

@@ImRanz25 every antenna dimension affects its gain. If you mean height above ground, i.e. its physical location then no.

[@RaselAhmed-IT]

So much information given in this short video, that's sounds good to me for understanding the Antenna Gain.

[@soufianebenn1327]

underrated channel indeed

[@VADroidTS555]

Best explanation so far, thank you!

[@haikvartanian4101]

Thanks you that was easy but I have a question how do you now the best frequency??😊

[@Rfelements]

Hello. The best frequency is the one you select in your spectral analysis that has less noise. Worth to mention that with a proper antenna, like ours, you can improve the noise floor in your spectrum and therefore have the option to select more frequencies and get better performance. This is due to the lack of sidelobes that our antennas have. Thanks!

[@haikvartanian4101]

@@Rfelements Thank you very much but now I have another question 😅 why some frequencies have higher power output but not reliable and other frequencies have lower power output but it is mach better?? and thanks 😊

[@haikvartanian4101]

@@RfelementsI’m your follower from Iraq 🇮🇶 and we rely on this type of internet connection and we have a very low speed and fake (cash) internet connection and thanks to your videos i managed to get a speed between 1.5 to 3 mbps

[@dionisisch]

Hi ! Nice video!! I want to ask you... if I only care about the receiving signals (don’t care about transmitting) would I have to prefer a high dbi antenna or a medium?? Is higher dbi antenna more sensitive to receive??? Thank you in advance

[@Rfelements]

Hi Dionysis, antenna is a reciprocal device. This means that its gain is the same whether it's transmitting or receiving, that is the physics of antennas. The decision on what gain you need can be done using link budget equation -> kzbin.info/www/bejne/fJ7Ll3WPmK-YjNE

[@samson8779]

Thanks for the wonderful explanation, confused about center loading top loading and base loading antenna? no video found in your list. let me know the link. THanks again

[@Rfelements]

Hello. Can you please be more specific about what you mean? Thanks.

[@GauravSharma-kz1xi]

Can you please put some light on Duplexer and Diplexer?

[@Rfelements]

Thank you for the tip, we're always looking for interesting topics to shed light on.

[@jaweherturki7273]

great video, what does it mean to have a negative gain ? thank u

[@Rfelements]

Hi, negative gain at some particular angle means that the antenna radiates weaker than the reference antenna used for the measurement - in most cases a dipole.

[@GauravSharma-kz1xi]

short and precise. I loved your videos

[@ferdousislam2323]

i stands fo isotropic and antenna gain is directional then why antenna gain is dBi

[@Rfelements]

The 'i' is there because dB is a unit that is always compared to some reference value.. Various engineering disciplines have their specific 'version' of dB units and in antenna engineering, to make it clear the gain shown is referenced to isotropic antenna, the dBi is used. There is for example also dBm which is a power unit in RF engineering with reference value milliwatt, or dBc comparing signal power to that of the carrier wave. Check this page if you want to know more: www.bitweenie.com/listings/the-decibel/

[@AhmadSalman-l9e]

great videos , please we need more ..., thanks for u huge efforts

[@anuppandey8038]

How to calculate Antenna gain in any 3d direction, given Msi file or Horizontal gain and Vertical gain

[@Rfelements]

You can use a Matlab code to do that including a visualization: www.mathworks.com/help/antenna/import-export-and-visualization.html

[@anuppandey8038]

@@Rfelements I looking for the formula to get the gain/directivity in 3 dimensions using msi file [Horizontal gain+vertical gain ]

[@Rfelements]

@@anuppandey8038 check the 'More about' section on this link, the equation you're looking for is there: bit.ly/2MUBhzz

[@anuppandey8038]

@@Rfelements yeah, that's what I was looking for, Thank you so much

[@arieldelacruz522]

hi, I got a anntena of 9dbi gain but if a buy another anntena of 11dbi, it is the double of power? you said every 3db it's the double of power how represent 11dbi ?

[@Rfelements]

Hi Ariel, you should check this information about logarithmic scale. bit.ly/3rvOqNX Generally, you to convert antenna gain dBi into absolute values, all you need to do is to take the dBi number and insert it into this simple calculation - x = 10^(G/10). So in case of 3 dBi difference x = 1.99 - thus the double of power. For 2 dBi difference x = 1.58

[@SuAmigoElilegal]

Question. I have a dual antenna whip nagoya. It has 3.5vhf and 5.5 of gain uhf. If i tune the uhf frequencie tona desire, will the gain dimish or be affected and the vhf .

[@Rfelements]

The gain of the antenna is determined by the used frequency. So if it's tuned to the UHF, its gain is 5.5 dBi according to what you write.

[@Greyam-cm2gt]

Im a big fan of your team now.very nice useful,clear because with animation. Thanks

[@Rfelements]

We're glad you find them useful, enojy!

[@Jaytalkscrypto]

Awesome explication

[@TechnicallyExplained]

I appreciate your video.. But gain can be expressed in both dB and dBi...as you can see in CST, which is antenna design software, represents gain in dB and another thing is dB and dBi are both same..so 6 dB also means 6dBi, so we can use dB and dBi to represent antenna gain

[@Rfelements]

Seems like you misunderstood some thing. dB and dBi are NOT the same thing. The only way you can see a radiation pattern of an antenna in dB in CST Microwave studio is when you normalize the plot to 0 dB, then any reference value looses its meaning. In any other case you always have a reference physical unit such as mW, V/m, etc. which CST marks with a suffix. Hope this helps.

[@TechnicallyExplained]

I think you failed to understand my point..dB and dBi are equal...e.g. 6 dB equals 6 dBi..and yes gain can be expressed in dB as well

[@Rfelements]

Hello, thanks for your comments. If dB was the same as dBi, then you could use it interchangeably, which you cannot, thus they're not the same. Not with gain or any other variable. If you mean that 6 dB difference equals to 6 dBi difference in the mathematical sense, sure, you can say that about any dB number given you use 10*log10(X) definition..

[@watchmewatch66]

@@TechnicallyExplained dB can mean anything. dBi means antenna gain in reference to isotropic radiator.

[@TechnicallyExplained]

dB is the ratio and not with reference to absolute value..dBi is with respect to isotropic antenna..an absolute value

[@SzymonAdamus]

Great explanation. Thanks.

[@muhammadalikhan7271]

very easy way of teaching thankyou dear

[@Rfelements]

Glad you enjoy it and find these videos useful!

[@josefranciscoboydzamora6445]

I still don't understand the log scale..

[@jeffm2787]

And gain changes with polarization. Good video.

[@Rfelements]

Not necessarily, for example our symmetrical horns have practically identical gain on both polarizations.

[@dannolan7752]

Just out of interest, why is it dBm and not dBmW?

[@Rfelements]

it's shorter :D but seriously, it was established by a group of institutions and became a standard for everyone later on. You can read about it here: ieeexplore.ieee.org/document/1687016

[@dannolan7752]

@@Rfelements Good to know. Thanks!

[@qzorn4440]

wow I am gathering stuff to make a 21cm 1420 MHz hydrogen-line radio telescope. It sounds like a 20dBi dish antenna would be better verses a 15dBi dish antenna? 😎 Thanks. Also, are there videos in DIY making a 1420 MHz dish or horn antenna?

[@apulpandiangan1826]

Thank you.. simple explanation

[@Rfelements]

You are welcome

[@albertohdezmx]

I want to know how can I Make this kind of measures of an specific antenna ? I want to compare the ration pattern of 2 dipole that are in different positions. Thanks and Congrats for this masterpiece videos :)

[@Rfelements]

In what regard are you trying to compare the antennas? Dipoles have a common donut shaped radiation pattern, or a mushroomy one if it's a planar one..

[@albertohdezmx]

@@Rfelements there are some modems that could have the antenna support broken, I want to know if the position of the antenna could affect with de radiation pattern

[@Rfelements]

@@albertohdezmx as long as it's properly connected the position of antenna does not affect the radiation pattern.

[@ingdabit]

Thank you Sir, very well explained.

[@RomanLeBg]

its a reupload ?

[@Rfelements]

Yes, we were polishing some details in the video, so had to pull it down

[@thyagorodriguesdesouza3356]

thanks!!

[@albugizy]

thanks, good lesson

[@Rfelements]

Glad you liked it!

[@Forgan_Mreeman]

he kind of reminds me of Kevin O'Leary

[@Mundovariedad2]

EXCELENTE √√

[@AhmedButt5]

Why you are in rush....?? Better to be little slow so everyone can match your pace. Please discribe this again.

[@Rfelements]

Inside Wireless are meant to be short and to the point ;)

[@teluguengineering5768]

@@Rfelements that's straight to point and interesting. What we need😀

[@sjjvddyumiherhv3709]

i hate telecommunication engineering