This article investigates the novel use of additive manufacturing (AM) in the production of interdigital cavity filters. It is found that AM enables the production of interdigitated pins of complex cross-sectional geometry, leading to the development of a suitable synthesis method using a commonly available 2-D eigenmode port impedance solver. The method is validated by manufacturing an L-band interdigital filter of 70% fractional bandwidth with triangular bars through selective laser melting, as well as a classical design using rectangular bars. It is found that triangular bars obtain similar coupling to rectangular bars over the average of 35% wider spacing gaps, reducing its sensitivity to manufacturing error. In addition, neither filter requires postproduction tuning, although the bars do warp slightly during printing. These results illustrate the advantages of using AM for the synthesis of wideband interdigital filters.
Gaskell, Anthony A.; Stander, Tinus(Institution of Engineering and Technology, 2016-03)
An on-chip implementation of a W-band filter with dual notches at 82
GHz and 95 GHz is presented. Reflection mode filtering methods are
implemented with dual hairpin resonator networks, using the inherent
Alatise, Mary B.; Hancke, Gerhard P.(MDPI Publishing, 2017-09-21)
Using a single sensor to determine the pose estimation of a device cannot give accurate
results. This paper presents a fusion of an inertial sensor of six degrees of freedom (6-DoF) which
comprises the 3-axis of an ...
Malherbe, J.A.G., 1940-(Institute of Electrical and Electronics Engineers, 2018-06)
The realization of planar wideband bandpass filters with an extremely wide upper stopband is described. The filter design differs from conventional approaches in which it is based on the choice of a wideband bandstop (BS) ...