Ultra-Broadband Overmoded Waveguide Junction with High Gain Aperture for the W- and D-Band

Recent advancements in integration technologies show a consistent trend towards higher frequency ranges and bandwidths. Benefits include smaller footprints and higher range resolutions. Thus, it is beneficial to utilize higher frequency bands and bandwidths, particularly for imaging techniques such as synthetic aperture radar (SAR) or tomography. Therefore, the D-band is now being used more frequently in addition to the W-band. This paper presents a waveguide junction that can be used to guide electromagnetic waves in the frequency range from 70–170 GHz. A slot card is used to mechanically switch between the W- and D-band. Additionally, the design incorporates a high-gain antenna, which is used for both frequency bands. This is indispensable for material characterization, as no mechanical adjustment is required to align two antennas. The waveguide junction achieves good results in terms of matching and transmission properties and the mechanical components exhibit very high reproducibility.