routh
Newbie level 4
I am trying to build a normal mode helix antenna (UHF band) with a long thin copper wire
Now the total length of the wire I used to build the antenna is about half-wavelength
The measured S11 of the antenna looked ok but not very good
The main reason is the real part of the input impedance of the antena is a bit low
Is there anything I can do to improve it? e.g. using a longer wire like 3/4 wavelength
The challenge is mainly because there is no descent ground plane for this antenna
which is also why I tried this half-wavelength helix antena
The suggestion about other types of antennas (unbanlanced) do not require ground plane is also welcome
Now the total length of the wire I used to build the antenna is about half-wavelength
The measured S11 of the antenna looked ok but not very good
The main reason is the real part of the input impedance of the antena is a bit low
Is there anything I can do to improve it? e.g. using a longer wire like 3/4 wavelength
The challenge is mainly because there is no descent ground plane for this antenna
which is also why I tried this half-wavelength helix antena
The suggestion about other types of antennas (unbanlanced) do not require ground plane is also welcome