THz Antennas

THz Antennas

TK develops a whole range of Antennas for applications in Short range TV distribution, Plasma Fusion Diagnostics and Remote Sensing. Here are some images of a 140 GHz antenna built for Dr.Alessandro Simonetto of the Istituto di Fisica del Plasma in Milan, Italy. This is designed to simulate the HE11 beam generated from a corrugated guide transporting MWatts of power from Gryotrons to the Frascati Tokomak.

milan3.jpg (11550 bytes)

Here the field produced by the antenna is being probed in the nearfield to check that the pattern is correct. Measured 1/e amplitude beamwidth was within 3% of the designed value.

milan2.jpg (10864 bytes)

Here Antonio Caltalfamo, our Italian agent looks on as the tests proceed.

milan4.jpg (10717 bytes)

To insure that no cross-polar siganal could escape from the Antenna when acting as a transmitter a large polarizing grid was placed in the output beam.

milan4.jpg (10717 bytes)

Gaussian Optics Lens antennas

We make GOLA antennas to order, feeding bloomed lenses with corrugated horns.

Antennas for accurate materials measurements

TK develops antennas for materials measurements: Here is an example of a 28 to 40 GHz materials measurement range with two corrugated horn/off-axis mirror antennas used to couple power with very low loss for a UK based research establishment

The antennas are placed in a RAM covered anechoic chamber to minimise reflections and standing waves. Here is a close-up on one of the antennas

These loss measurements, taken with a network analyser for both co-polar and X-polar signals show how effective the antenna is at coupling power across the sample space.

Loss is very low, and (nodoubt due to small calibration errors) actually negative in places: