From simulations to measurements: prototyping an antenna for non‐linear applications at sub‐THz frequencies

Abstract

The simulated characterisation and tuning of prototype antennas prior to manufacture is described in this article. The antennas incorporate Schottky diodes so as to frequency triple incident sub-THz power. Such a dual frequency, nonlinear, device has been called a multenna. A metrology is outlined for ease of multiple measurements to permit exploring scenarios of multenna element design. Four options are optimally oriented and assembled onto an appropriately dimensioned tile substrate to minimise mutual coupling during characterisation of each element individually. Transmission measurements of the multennas are performed at 100 and 300 GHz: an example of resonant behaviour is presented.

Additive Manufacturing of a Terahertz Back-to-Back Horn Antenna for Use in Life Sciences

“…The typical beamwaist around the focal point of such systems at 0.1 THz is 8 to 9 mm [24]; however this beam-waist will be smaller at 0.3 THz. Since the beam waist is narrow, small non-linear elements can be excited using such a system [25]. Here, however, we place a 3D-printed back-to-back horn at the focal point of the QO transmissometer system, in order to collect all the energy from the fast-focusing mirrors and concentrate it to the centre of the back-to-back horn.…”