I’m working on a parabolic antenna for my drone. I need it to work with a 5.8GHz RX and a 2.4GHz TX, but I’m not sure how to figure out the dimensions, the focal point, or other specifics. I have a 3D printer and some decent skills in 3D modeling, so I just need to know the correct dimensions. Is there a tool or calculator to help with this? Or do I need to do the math by hand? If anyone could help me out, I’d really appreciate it!
What’s the accuracy of your gimbal or how well can you point it manually?
You’ll want the beamwidth to be just a little larger than your ability to aim the antenna.
Harlow said:
What’s the accuracy of your gimbal or how well can you point it manually?
You’ll want the beamwidth to be just a little larger than your ability to aim the antenna.
I’d say I’m fairly accurate by hand. I don’t have a gimbal for now because it’s way out of my budget (which is basically zero dollars). I’m using parts salvaged from an old drone.
So, what dimensions can I just pick, and what needs to depend on the frequency?
I was thinking of making the antenna curved in only one axis so yaw matters but not pitch. That seems much simpler, and I’ve seen similar designs.
@Charlie
The dish size and shape depend on the frequency, but the dish itself doesn’t have to resonate like the dipole does, so there are no strict dimensions. A larger dish gives more gain and a narrower beam. Higher frequencies allow for smaller dishes with the same gain.
If you’re just experimenting, you might want to start with something simple like a soda can dish. Check out this example: https://cults3d.com/en/3d-model/gadget/wi-fi-signal-booster-parabolic-reflector-wifi-wifi-wireless-internet-router-signal-range-boost-extender.
Keep in mind that the accuracy of the dish’s shape should be within 1-2mm. Double-check your 3D prints to make sure they match what you designed. That’s why soda cans are often used—they’re naturally smooth and easy to work with.
Try this calculator: Dipole Calculator | Antenna Length Calculator
Gentry said:
Try this calculator: Dipole Calculator | Antenna Length Calculator
Isn’t this just for a dipole antenna? I’m trying to make a parabolic one.
Gentry said:
Try this calculator: Dipole Calculator | Antenna Length Calculator
Isn’t this just for a dipole antenna? I’m trying to make a parabolic one.
The dipole is the central part of your setup. The dish just focuses more signal onto the dipole.
@Gentry
I already have a 5.8GHz sleeve dipole antenna. I don’t need to make one from scratch.
Charlie said:
@Gentry
I already have a 5.8GHz sleeve dipole antenna. I don’t need to make one from scratch.
As far as I understand, the dish is connected to the dipole’s ground. This helps block unwanted signals from the sides or behind.
@Gentry
So, I should connect the dish to the dipole’s ground wire?
Charlie said:
@Gentry
So, I should connect the dish to the dipole’s ground wire?
That’s my understanding. The dish acts as a shield to block everything except what’s in front of it.
Charlie said:
@Gentry
So, I should connect the dish to the dipole’s ground wire?
Also, the dish should ideally be made of wires or material sized to match the wavelength of the frequency you’re using.