Re: Antenna 100MHz

Hello Frank,

1. it means it is not possible reduce sizes by this way?
2. my "antenna",
is an reception antenna...
i remember that for reception antennas S/N factor is important?
later i plan connect a LNA to it...


what you can say?

If the IL(insertion loss) is almost zero means almost all
the power is transmitted to the second port, small
power is radiated. Are you confusing Gain with Directivity?.
I do not know much about Sonnet, I played with it a
long time ago, but I bet that is the directivity. Correct me
if I am wrong.

look what they write in sonnet:

"Calculation of the far field antenna pattern: The Sonnet far field pattern viewer
calculates the far field pattern of the antenna from the analyzed current density and
displays the antenna gain in 2D Cartesian or polar format. You can normalize the
pattern to show the directive gain or the antenna gain.

"If you choose to display the directive gain (also known as directivity), the radiated power is normalized to an ideal, isotropic radiator that radiates the same total power. The output is the far field pattern of the antenna. Please note that any antenna losses will not be taken into account.

If you choose to display the gain (also known as power gain), the radiated power is normalized to the input power. All dielectric and metallic losses are taken into account. The gain is therefore always smaller than the directive gain."

Can be possible that the radiated power
is normalized to input power but this
input power is counted as (output power
on port 2 - input power on port 1)?