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Thanks for the insight. Using search term "direction finding antennas" does indeed show several suppliers of these antennas. I am guessing that in our area they are used by vehicle tracking companies.
I have seen several of these antennas in our city and was wondering whether anyone can identify what this is, as per the attached pic ? Could it be some sort of direction calculator, similar to VOR ? What is the antenna used for ?
Thank you for clearing that up. I have used the terminology to Google the topic to bits. WarDriving was another new word too:-)
From your own experience ,and although the gain for the collinear is very good in the plane of reception, is there an advantage to using these antennas in a closed...
What is the lumped structure halfway along my GSM antenna? The antenna is approximately 25cm in length. One variation has a coil, or spiral, halfway along the length of the antenna. What is the purpose of the coil or spiral ?
Attachment gsm1 shows the spiral, attachment gsm2 shows the lumped...
That does make sense. I have seen the wild oscillations on the stubby antenna used by the Le Mans Porsches. The rapid oscillations resulted in a blur where the antenna was positioned. I was wondering whether this rapid oscillation would have an effect on the tx or rx of the telemetry. Probably not.
Some cars have a whip antenna with a spiral of wire attached to the stalk of the antenna, as per the attached picture.
I have read (on various groups) that the spiral is there to reduce wind resistance and noise, alternatively that it covers AM reception as opposed to the content of the stalk...
The attached figure is a comparison of the Free Space Path Loss (FSPL) from a point source against the power loss calculated using the 2D FDTD. The m along profile is the distance along a radial through the point source (at 2m). 0 gain for transmitter and receiver.
The black line is the FSPL...
I am looking to calculate the power of the signal in watt at a specific point. Imagine the signal propagating away from a vertical dipole antenna. Because of the symmetry in my layout I can use the 2D FDTD, but how can I determine the power in the signal at some y(vertical) and x(horizontal). I...
What is the relationship of the signal power calculation in the 2D FDTD to the Poynting vector?
I measure my signal power from a TE FDTD calculation with the formula :
Power in (watt/m^2) = 0.5 * sqrt((Ex*Hz)*(Ex*Hz) + (Ey*Hz)*(Ey*Hz)) with the wave propagating in the positive x direction...
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