Re: NEC-LIST: disconic antenna, top loaded monopole,

miguel angel martinez esparragoza wrote:

> Hello i am designing a disconic antenna
> with nec win prlus.
>
> i don't how to fed this antenna
>
> i put a souce voltaje in the center of the disc, an put a transmition
> line that connect this point with the center of the cone.
>
> was it correct?
>
> Otherwise i desig too a top loadeded monopole using wires, but i dom't
> know how to fed it because i am usign wires.
>
> I constructed a body in three dimensions for both antennas.
>
> I think is important to consider the fed point but i don't know how to do it.
>
> Someone would help me?
> someone have information about top loaded monopole?
>
> please answer me.
>
> i hope to look forwart to hearing you.
>
> regards.

dear Miguel,

feeding the discone antenna : the discone consists of a conical
section with the vertex, opposite to the base of the conus. The conus
has a center hole from the base to the vertex that allows a coax cable
to connect to the disk which is on top of the conus. The center of
the coax is connected to the disk, whereas the outer conductor
connects to the conus. The base diameter and the height of the conus
is approx. two wavelengths in diameter. The diameter of the disk is
approx. one-and-one half wavelength. The impedance, above the cutoff
frequency, is fairly constant across a frequency range of 1 to 4.

Max J. Schmitt
Cons.Eng.
Received on Sat Jan 27 2001 - 18:55:49 EST