Biquad Antenna

[RC-Concepts 3]

On 16/01/2017 at 11:36 PM, Admin said:

,,,a biquad antenna on PCB(10,5dBi) and panel antenna with 4biquad(16.5dBi)...

 

 

The Best ....!!!

 

 

Thanks Admin, I made one for RC toy bird and it doubles the RC range! 

 

[Admin 2545]

RC-Concepts,congratulations....!!!!

[RC-Concepts 3]

56 minutes ago, Admin said:

RC-Concepts,congratulations....!!!!

Thank you sir! I will try to make your 5.8g version next. 

[Admin 2545]

,,, okay, I wish you success ... !!!

[mojtaba.hdpr 1]

On 1/16/2017 at 7:06 PM, Admin said:

,,,a biquad antenna on PCB(10,5dBi) and panel antenna with 4biquad(16.5dBi)...

 

 

 

 

 

 

 

hi admin

what is dimensions of panel antenna with 4biquad(16.5dBi) ??

[Admin 2545]

51 minutes ago, mojtaba.hdpr said:

hi admin

what is dimensions of panel antenna with 4biquad(16.5dBi) ??

Something like that....

[nikram77 0]

Hello to everyone

This PCB biquad looks like a great idea. I manufactured few biquads from wire and they work great, but making them is time consuming and not very precise.

First time I did almost 20 bowties before I made correct one... And then soldering.... 

There are few online sites where you can order professionally made pcbs for few $ and I would loove to try that, but...

I have no idea about PCB design process/software, could someone generate me those gerber files (or enything else to order pcbs online)?

All my biquads are centered on 2370mHz (it`s for fpv video feed so as far from Wifi as possible), but watching RC-Concepts video I see that standard 2442 is wide enough.

 

Cheers

[Admin 2545]

,,,nikram77,, you see, that suits you ... ???

simple biquad.gbr

[nikram77 0]

10 hours ago, Admin said:

,,,nikram77,, you see, that suits you ... ???

simple biquad.gbr

That`s exactly what I need

Now I only need to figure out how to order on one of this pcb making sites - plenty of tutorials for this.

Thank you 

[Admin 2545]

,,,okay Nikram77,,, if you manage to order PCBs, you can send to me some pieces...???

,,,,this is *gbr file for pcb FR4...

dielectric .gbr

[nikram77 0]

10 hours ago, Admin said:

,,,okay Nikram77,,, if you manage to order PCBs, you can send to me some pieces...???

,,,,this is *gbr file for pcb FR4...

dielectric .gbr

Sure I can.

But it wont be as easy as I imagined. Ordering I mean.

I reached out to Terence aka RC-Concept, he ordered his so asked about all files he used.

That would be perfect solution, otherwise I need to learn all that PCB designing software (which will take some time).

 

[nikram77 0]

For now I still have my wire biquad, which isn`t bad (gives me clear video up to 10-13km).

The only bad thing about it is fragile in transport (wire bending, etc), and any bends means out of tune.

And I really don`t want to build aother one (from wire). That`s why  want this pcbs.

[Admin 2545]

,,, maybe the * dxf file can help,,,

fr4 biquad.dxf

pcb biquad.dxf

[RC-Concepts 3]

On 6/13/2017 at 11:26 PM, efeksk said:

 

Dude, you are absolutely perfect. I built the first Antenna and tested it. The results are great.

 

 

 

It is year 2020 now. And today we have digital HD FPV. Here I have built the same PCB 5.8g biquad and used it for the DJI digital FPV system. My feed points are slightly different and my center frequency is lower as a result. Test result appears promising in the video below:

 

[Admin 2545]

,,, good job buddy, congratulations...!!!!

,,, please tell me, at what maximum distance can you pilot this drone .. !!!!

,,, and if the SWR meter is built by you...???

[RC-Concepts 3]

5 hours ago, Admin said:

,,, good job buddy, congratulations...!!!!

,,, please tell me, at what maximum distance can you pilot this drone .. !!!!

,,, and if the SWR meter is built by you...???

Thanks, I haven’t tried maximum distance yet. In my video above, the drone was able to fly 300m away in the direction of my 9 o’clock when 2 biquads are pointing at my 11 o’clock and the other 2 are pointing at my 1 o’clock. This performance was pretty amazing.

The SWR is built by Owl-RC and it is available here: http://www.owl-rc.com/product/SWRMETER.html

Edited May 3, 2020 by RC-Concepts

[Admin 2545]

,,,ok,thanks,,,!!!

,,, and SWR-meter can be DIY...???

[RC-Concepts 3]

21 hours ago, Admin said:

,,,ok,thanks,,,!!!

,,, and SWR-meter can be DIY...???

Yes the SWR meter can be DIY, if you see my video below, we can have RF switches controlled by Arduino to switch the video transmitter’s connection and the antenna’s connection to the directional coupler (without removing them physically), to measure FWD and REV voltages (output from the RF power detector) using the same Arduino and plot the SWR curve to a screen. As this is a lot of work, buying the SWR meter from Owl-RC is a better option.

 

[Admin 2545]

,, and how much does cost the SWR meter from Owl-RC ...???

[RC-Concepts 3]

4 hours ago, Admin said:

,, and how much does cost the SWR meter from Owl-RC ...???

105usd from Aliexpress

[Admin 2545]

,,, it's not a bit expensive compared to this one...???

 

[RC-Concepts 3]

8 hours ago, Admin said:

,,, it's not a bit expensive compared to this one...???

 

You need to buy the 9usd SWR bridge ( directional coupler), to measure SWR on this device. 

Also, this device can only measure antennas for frequency less than 3ghz  because it has a signal generator/tracker which is only up to 3000mhz.  The 9usd SWR bridge also supports up to 3ghz only. The biquad we want to measure is 5.8ghz. 

Therefore, it cannot be compared to the Owl RC which has a 5.8ghz signal generator and a directional coupler that is designed for 5.8ghz. 

[Admin 2545]

,,,, hey man, I only posted this as a price comparison...!!!

[RC-Concepts 3]

Thank you for posting it for price comparison, I think it is a nice spectrum analyzer for hobbyist, and it has a good price too.

It is a great tool for measuring S11 and S21 since it has dual ports.

 

Although the spectrum analyzer sweep is terrible (non granular span steps and super slow), it is useful for tuning antennas for HDTV (UHF band), 2.4ghz(WiFi/BT/RC), 433mhz, 868mhz, 915mhz (telemetry/LRRC), 1.2ghz (FPV) and 1575mhz (GPS) because the inbuilt 3ghz Signal Generator and Signal Detector could measure the reflected co-efficient (plot SWR/ return loss curve) with adding the optional 9usd directional coupler. 

[RC-Concepts 3]

 I might buy it

Edited May 5, 2020 by RC-Concepts