What type of interface circuit is used between the final amplifier output and the antenna? I see a lot of circuits use a group of inductors and capacitors after the amplifier output to the antenna. For example what are these capacitors and inductors after the coupling capacitor up to the antenna
1- Are these just filters?
2- I also want to know about impedance matching. Do I need impedance matching for my simple wire antenna, at frequency of 433 MHz?
3- How I determine the values of these capacitors and inductors ?