Abstract
The development of multi-pixel receivers on the millimetre-wave and terahertz bands demands on the integration of key waveguide devices. In this paper, two waveguide bandpass filters operating at the W-band are developed based on the layered integration architecture. First, the traditional fourth-order waveguide filter is perpendicularly folded to realise dual-layered arrangement, meanwhile a cross-coupling between layers is introduced to obtain the standard quasi-elliptical response. Then, two layered approaches including 5-layer and 3-layer are proposed to fabricate filter prototypes integrating with 90° curved waveguides based on the computer numerical control (CNC) technology. Finally, the measurement exhibits that both filters have achieved the 3 dB fractional bandwidth of 14.8% from 85 to 98.5 GHz, low insertion loss of 0.6 dB (5-layer) and 0.4 dB (3-layer), the return loss with better than 20 dB, as well as two obvious transmission zeros in the out-of-band. Besides, the layering error analysis and performance comparison of both filters are discussed, which verify the feasibility of the layered integration for CNC-machined W-band waveguide filters.
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