On Apr 3, 1:55 pm, Jim Lux wrote:
junoexpress wrote:
Hi,

I am wondering if anyone has data for a directional gain antenna
(DGA). What I would need are the gains and the phase of the antenna as
a function of (phi,theta). I am working with a group that has such an
antenna, but I think that their work is not very good. I am not
looking for anything fancy or even that good in terms of performance:
I am doing some performance analysis using beamforming algorithms for
GPS signal acquisition, and I want to incorporate DGA into my analysis
and get some basic results as to how much the DGA improves
performance. (Of course, any work I do, I would cite the use of your
data).

You can reply either on the ng or to my e-mail address.

Thank you very much,

Matt Brenneman

depends on the specific directional antenna.
Are you looking for approximations?

Hi,

I would say that the specifics are not that important. The DGA we
worked with had a cylindrically symmetric gain pattern that resembled
a "skinny" cardiod. The gain at the zenith was about roughly 12 Bic,
which fell to roughly 1 Bic at about 60 degrees (where the angle
measured is not the elevation, but the spherical coord theta). In
fact, you just made me realize that I fit the theta dependence very
well via the equation
0.00002399q^3 - 0.0031083q^2 - 0.025008q+11.0153
and that the phase as a function of theta was very linear, and that
the phase as a function of phi was "about" constant.

Matt