I am trying to develop antenna for telemetry module to communicate long distance(20km) on rockets.
Antenna shape I want to develop:
900mhz 3dbi Helix normal mode antenna.
For the telemetry module, which receives and transmits signals horizontally, I want to make an antenna whose wire is wound in a helix shape on the outer surface of the rocket by calculating the pitch length and the number of rotations in which the wavelength is determined.
The reason I'm trying to do this is;
If I use the "868-900MHz Half Wave Dipole 3dBi" antenna that comes with the module, I will have to place it inside the rocket to protect the antenna and I think this will reduce the reception quality of the antenna.
Even if I put it outside, since the antenna is only on one side of the rocket, if the rocket turns to an angle where it cannot see the antenna on the ground, the signal quality will still decrease.
My first question is, does anyone have any suggestions about the method of placing the Standard Antenna on the rocket?
My second question: I am trying to make a normal mode helix antenna. I am using ''CST studio suite'' as an analysis application for antenna.
I designed an antenna like below and the test results are as follows. Do you think these results are correct?
On the 115mm diameter pipe, 7 turns of 1.5mm thick wire and 24 pitch length were used.
Does anyone have any suggestions or a different opinion on this?
Antenna shape I want to develop:
900mhz 3dbi Helix normal mode antenna.
For the telemetry module, which receives and transmits signals horizontally, I want to make an antenna whose wire is wound in a helix shape on the outer surface of the rocket by calculating the pitch length and the number of rotations in which the wavelength is determined.
The reason I'm trying to do this is;
If I use the "868-900MHz Half Wave Dipole 3dBi" antenna that comes with the module, I will have to place it inside the rocket to protect the antenna and I think this will reduce the reception quality of the antenna.
Even if I put it outside, since the antenna is only on one side of the rocket, if the rocket turns to an angle where it cannot see the antenna on the ground, the signal quality will still decrease.
My first question is, does anyone have any suggestions about the method of placing the Standard Antenna on the rocket?
My second question: I am trying to make a normal mode helix antenna. I am using ''CST studio suite'' as an analysis application for antenna.
I designed an antenna like below and the test results are as follows. Do you think these results are correct?
On the 115mm diameter pipe, 7 turns of 1.5mm thick wire and 24 pitch length were used.
Does anyone have any suggestions or a different opinion on this?