While studying for a HAM license exam I ran into a question that I am having trouble with answering. There are two aspects that I cannot explain, given my current admittedly little understanding of the subject.
Given the following statement in the exam text...
The damping between two vertical half-wave dipoles is measured at a certain frequency. The antennas are set up in free space. If the frequency is doubled and the dimensions of the half-wave dipoles are adjusted accordingly, the damping will increase by 6 dB. (Translation is my own, original is in Dutch)
... I have the following questions:
- Why does damping increase rather than decrease with increasing frequency, with their relative distance of the antennae being (assumed) constant?
- What is the appropriate logic or formula to apply here that explains why there is a 6 dB increase rather than (say) 3 dB?