I send signals using the FS1000A, i.e. 433MHz. The module has a pin named "ANT", where I can solder an antenna, like a short piece of wire.
As the sender's range is not that far, I want to increase the range. Having basic knowledge in LC circuits, I thought that I could proceed the following:
According to the thomoson equation:
I need ideal values for L and C to get best range for a certain (here 433MHz) frequency. According to the following circuit, the capacity is 7pF:
So can I just connect an electromagnetic coil (i.e. coiling a piece of wire) having the right inductance L.
That would be true if it was a LC circuit. However, the antenna itself is a dipole antenna, so that I have to use other equations in order to determine the ideal parameters of the antenna. I know that the minimum length is λ/2 and every k*λ/2 (k in ℕ) works well. How does k influence the range? It is better to connect a electromagnetic coil instead of just a piece of straight wire, right? How do i determine electromagnetic coil's parameters (length, ...), as I cannot use the equations above for this purpose, can I?