Fully micromachined W-band rectangular waveguide to grounded coplanar waveguide transition

Broadband Rectangular Waveguide to GCPW Transition

“…However, for many applications, conductor-backed CPW (GCPW) will be needed: the back conductor of GCPW can be used to provide added mechanical support and heat sinking ability compared to conventional CPW [1]. The GCPW can be built on many kinds of manufacturing processes, such as LTCC process [3], integrated circuits process [4], and standard PCB process [5][6][7][8][9]. Due to the advantages of high quality factor and power-handing capacity, the metallic waveguides still play an essential role in millimeter-wave systems.…”

“…Several waveguide-to-GCPW transitions have been presented in the open literatures [6][7][8][9] and some good performances are observed. These transitions are either along the propagation direction of the waveguide [6,7] or perpendicular to the propagation direction [8,9].…”

“…These transitions are either along the propagation direction of the waveguide [6,7] or perpendicular to the propagation direction [8,9]. A uniplanar waveguide-to-GCPW transition is presented by using an open-ended strip [6], there is a need of an intermediate transition of the GCPW to the slot-line transition, and additional air-bridge is needed after the assembling of PCB which adds the fabrication steps.…”

“…The modified waveguide and suspended pin make the fabrication complicated. Compared with those in-line transitions, some right-angle transitions are presented [8,9]. A double-slot antenna coupling approach is adopted for waveguide-to-GCPW transition, and this right-angle transition has a 22% bandwidth at W-band [8].…”

“…A double-slot antenna coupling approach is adopted for waveguide-to-GCPW transition, and this right-angle transition has a 22% bandwidth at W-band [8]. However, those transitions suffer from insufficient bandwidth [6][7][8][9].…”