Pictures of G3YKI 10 GHz Omnidirectional Antenna

Antenna The Antenna
A standard flange ( which was on the wave guide before I started ) makes a convenient way of mounting the antenna.
The bracket adapts this to fit the roof bar of my car.

Feedpoint The Feedpoint
For my purpose a right angle connection was required. The inner conductor of the 0.25 inch semi-rigid cable is bent round to form the coupling probe.
Length and diameter of the probe do not appear to be very critical.
During testing an SMA connector was attached directly here.

Antenna again When mounted on the car a radome protects the antenna from water. This was made from domestic plumbing plastic pipe, about 1.25 inch diameter. A test in the microwave oven shows that the material is not excessively lossy, (at 2.4 GHz anyway)

Tuning Screw Tuning Screw
A fine thread is desirable on the tuning screw, as the antenna has a small bandwidth.
I believe the radiating holes, probe, and tuning screw are all effectively in parallel, being spaced along the waveguide at half-wave intervals. Alternative positions for probe and tuning screw should work just as well.

Return to description.