Investigations of connection repeatability for waveguides with different size apertures

Connection repeatability is mainly dependant on flange tolerances and aperture misalignment. A waveguide flange design establishing precise connections has been developed for use at millimeter and sub-millimeter wave frequencies up to 1.1 THz [1, 2]. Other research groups have investigated the misalignment effect of waveguide apertures on electromagnetic performance at the interface [3]. This paper describes simulation results of connection repeatability for waveguide TRL “through” line standards with two different sizes of aperture, undersized and about the same size when compared to a test-port aperture, in the WM-864 (WR-3, 220 GHz-330 GHz) frequency band. Comparisons between simulations and measurements are described.