Micromachined contactless pin-flange adapter for robust high-frequency measurements
Journal article, 2014

We present the first micromachined double-sided contactless WR03 pin-flange adapter for 220-325 GHz based on gap waveguide technology. The pin-flange adapter is used to avoid leakage at the interface of two waveguides even when a gap between them is present and can be fitted onto any standard WR03 waveguide flange. Tolerance measurements were performed with gaps ranging from 30-100 mu m. The performance of the micromachined pin flange has been compared to a milled pin flange, a choke flange and to standard waveguide connections. The micromachined pin flange is shown to have better performance than the standard connection and similar performance to the milled pin flange and choke flange. The benefits of micromachining over milling are the possibility to mass produce pin flanges and the better accuracy in the 2D design. Measurements were performed with and without screws fixing the flanges. The flanges have also been applied to measure two devices, a straight rectangular waveguide of 1.01 inch and a ridge gap resonator. In all cases, the micromachined pin flange performed flawlessly while the standard flange experienced significant losses at already small gaps.

high-frequency measurement



pin-flange adapter


gap waveguide



Sofia Rahiminejad

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Elena Pucci

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

S. Haasl

Royal Institute of Technology (KTH)

Peter Enoksson

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Journal of Micromechanics and Microengineering

0960-1317 (ISSN)

Vol. 24 8 Art. no. 084004-

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

Nano Technology



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