The antenna is constucted only of a cylindrical can and a N connector with centre tap lengthened. Just point the open end of the can to the ISP station and begin surfing. Oh, of cource there is needed some cable between the antenna and wlan card.
There are three different wavelengths in the waveguide tube. Here they are
marked as Lo, Lc and Lg.
Lo is the wavelength of the hf signal in open air or Lo/mm
= 300 / (f/GHz).
Lc is the wavelength of the low cut frequency which depends on tube dia
only Lc = 1,706 x D
Lg is standing wavelength inside the tube, it is function of both Lo and
Lc
A waveguide which is closed on the other end acts similar as a short
circuited coaxial cable. The coming hf signal reflects from ending point and
there forms so called standing wave when incoming and reflecting signals in
different places are either weakening or amplifiering each others:
If there is a measuring probe which is moving in axial direction inside the
tube there can be found some minimum and maximum points in certain intervals. At
the closed end the signal is zero and so will be in halfwave intervals. The
first maximum point is quarterwavelength from the closed end. This will be the
best place to outlet signal to coaxial line. You can notice that maximum area is
quite flat. So the place of the outlet must not be very accurate.
It is important to notice that the standing wavelength Lg is not the same as
wavelength Lo counted from hf signal. Large tubes are near as open air where Lg
and Lo are almost same but when tube diameter becomes smaller the Lg increases
effective until there becomes a point when Lg becomes infinite. It corresponds
the diameter when hf signal doesn't come to the tube at all. So the waveguide
tube acts as a high pass filter which limit wavelength Lc = 1.706 x D. Lo can be
calculated from nominal frequency: Lo/mm = 300/(f/GHz). Inverse values of Lo, Lc
and Lg forms a right angled triangle where becomes the equation of Pythagoras:
(1/Lo)2
= (1/Lc)2 + (1/Lg)
2
which can be solved
Lg = 1 / SQR((1/Lo)2
- (1/Lc)2)
In the antenna the N connector is situated in maximum point or length of Lg/4
from the closed end. Total length of the tube is selected so that the next
maximum place hits on the open end of the tube or 3/4xLg from the closed end.
The latter is only supposed by my own and found be not the worst decision.
http://www.saunalahti.fi/elepal/antenna2.html
