Good presentation for the mimo wall mount antenna

would be interesting to hook a nanovna up and check levels and such...

This was a great video , ty for doing it

To your question about the added element (@7:07) that isn't connected to anything but backplane (the rectangular aluminum strip example) is considered parasitic elements...& yes they can serve as tuning stubs, energy directors or reflectors etc. Typically add & size these elements to obtain a specific profile with respect to radiation pattern & efficiency.

@Bertemus60

Жыл бұрын

Microwaves are cool...allow easily made PCB antennas, tuning stubs, distributed element filters on surface of PCB (that's the cool looking artwork-appearing forms) RF combiners, splitters, all by shaped patterns on a PCBA.....can even create co-planer waveguide-in-a-PCB...of course the cheap epoxy resin type boards aren't up to it now but there are many more hi-tech substrates out there for creating entire circuits from patterning the copper or gold traces....fun stuff....nice work on the video's (watched 2 so far)

Given the positioning of that bar, I'm wondering if it is there to block any potential resonance coming to/from the solder points on the input lines. I could see transmissions causing slight feedback noise in the system if not shielded. Either that or the bar creates a difference in reflection incoming on the two cross polarized antenna ? Or possibly both?

Hello Kerry. Very informative video. Quick question. What kind of glue or sealant does the manufacturer uses to waterproof back the antenna when you put it back together again? Thanks.

clearly that raised stand-off structure between the smaller and larger antenna, is a null creating ground plane so as to help with proper impedance tuning for hte frequency band in use.?

Great video! Would it be possible to disable the larger elements that pick up the lower frequencies so that my antenna will be forced to pick up the higher frequency 5G bands?

@maukaman

5 ай бұрын

You could also just force the modem to connect to specific bands in software, depending on what type of firmware you’re running.

Pardon my lack of understanding but are these properly MIMO antennas? Don't MIMO require multiple transmitter and receivers to exploit simultaneous beams/multipath? Most MIMO antennas I've seen also feature many many more array elements.

@KerryWongBlog

3 жыл бұрын

As long as there are multiple independent antennas within the system they are proper MIMO. MIMO antennas range from simple implementations like this to phased arrays that contains hundreds of elements and used for beamforming...

@plyrvt

2 жыл бұрын

You mix completely different things. MIMO 2x2 antenna must have 2 excitation ports (to connect 2 transeivers) and isolation between those ports (at least 15 dB, but better 25 dB or more). There is no limitation on antenna type itself. Your WiFi router can have 2 monopoles and it is perfectly MIMO 2x2. Multiple elements are Phased Array antennas (they can be either SISO or MIMO it doesn't matter), more elements = more gain = narrower beam. Phased arrays can be either passive (elements directly coupled with transmission lines to single transceiver) or active (commonly used in radar applications). Small cell base station antenna (femtocell, indoor) shouldn't have narrow beam, but wide coverage, so phased arrays are not good choice.

Hi are the cross polarized antennas effectively are in circular polarization or just two dipole antenna arrangement for better reception and transmission of mobile station that have no fix orientation with respect to the base station sector antenna.

@KerryWongBlog

2 жыл бұрын

Cross polarization is not circular polarization as the transmitted wave by each orthogonality polarized antenna is linear. They are essentially two antennas as you mentioned arranged in such a way to achieve maximum cross polarization discrimination so that they do not interfere with one another.

@russellteejaymolina6736

2 жыл бұрын

Thanks for the clarification and quick response to my query, hope you will upload more videos related to antennas.

@plyrvt

2 жыл бұрын

Cellular operators use MIMO 2x2 2T2R X-pol antennas on base stations. Clients (smartphones, modems, tablets) also expect two simultaneous orthogonal linear polarizations incoming: one +45 degree to horizon and second -45 degree to horizon. Cellular applications do not use circular polarization. If you want to convert this antenna to CP (for applications non-related to cellular) you need combiner (splitter, bridge) with 90 degree phase invertion (can be hybrid coupler). 2 antennas in mobile client (smartphone, modem) is mandatory requirement for LTE user equipment. Older GSM and UMTS UE can have only 1 antenna. 2T2R MIMO 2x2 X-pol base station effectively track polarization in uplink and use best possible source or use them both simultaneously (as a phased array) if software is sophisticated enough.

is this the same inside as eifagur mimo ?

Can someone copy the drawing of these PCBs? This would make a good DIY specimen.

thet TAB on the AIR there . seems like a quick hot fix for the signal of LOW frequency (bigger antenna) SPILLING over the small antenna and harming the characteristics of high frequency...my guess

@KerryWongBlog

2 жыл бұрын

Thanks for your insight!

Hello sir...excuse me...recently I made 1 mimo antenna and when I tried to connect it to the modem, the antenna was able to catch the signal for 5-10 seconds before it disappeared...I want to ask, what is the problem and the solution to this problem...thank you 😀

@cuongtranvan8225

7 ай бұрын

soldering spot may not connect so well I think, that is why wifi connection is unstable.

hello sir...can u make 1 video to increase gain (example - from 9dbi to 18dbi) ... thx .. :)

@plyrvt

2 жыл бұрын

In antennas, gain is directivity of beam. 3 dB is 2x power thanks to 2x narrower beam. 12 dBi is twice larger antenna with half-wide beam. 15 dBi is again twice larger antenna. 18 dBi is again twice larger. To get narrow beam with 18 dBi directivity - you need at least 8x larger antenna (it can be 1x8 array, 2x4 or 4x2).

first

@artrock8175

3 жыл бұрын

Gratz! But as the saying goes, "1st is the WORST, 2nd is the BEST, 3rd - Is one that wins ALL of Kerry Wong's Ultra Expensive gear that he TESTS! And I'm 3rd! 😎👍Kerry Wong's reply to CSW Motion Picture doesn't count! 😁