Above: PCB design circa 1999. Here, we used ADS Momentum, in those days called a '2.5D' solver.These printed circuits are for x-band antennas
Modulated retro-reflector prototype. ‘RADASCAN’ system used on Shell Oil’s dynamic positioning vessels.
30GHz scanning lens low sidelobe multi-beam lens waveguide measurements 60cm Luneburg lensfor satcoms.
Lens antenna with corrugated horn, 30GHz carrier frequency Lens-reflector. A harmonic mixer is seen at the primary feed.This theme was also continued in the 6th Framework project ‘CAPANINA’ where I lead a work package on scanning antennas for vehicles. I published several papers in this area. I became quite intrigued by the properties of spherical dielectric lenses and built a prototype for 30 GHz. This was very successful and lead to the next activity...Scanning Antenna for Satellite Communications. (Sponsored by European Space Agency)I managed this project from the submission of the proposal to ESA to the final presentation, and lead a team of five in working out its design and construction. The project is more fully described in an article in Microwave Journal (August 2009).
Two primary feeds scan independently in azimuth and elevation. This allows two satellites to be tracked from one antenna. In the configuration shown above, one feed is used for two way communications at Ka band, while the other is a Ku band receive-only feed.
A view of the elevation control arm Receiving satellite TV with the lens antenna
The lens has half the height of an equivalent dish - ideal for low profile antenna.
Antennas pointing over the Vale of York A portable WIMAX base station The flight-ready WIMAX payloadA local company approached me to advise on the feasibility of point-to-point links for wireless provision of broadband to rural areas in North Yorkshire.
Microwave signal strength coverage. Modelling terrestrial propagation.