Ting, C.-W.C.-W.TingChen, S.S.ChenTZONG-LIN WU2021-05-052021-05-0520200149645Xhttps://www.scopus.com/inward/record.url?eid=2-s2.0-85094209338&partnerID=40&md5=29fad243763c01e681a18849c30cfe9ehttps://scholars.lib.ntu.edu.tw/handle/123456789/559285This paper introduces the design of an air-filled substrate integrated ridge waveguide (AFSIRW), and a transition design from microstrip line (MSL) to AFSIRW operating at 60 GHz. The proposed structure is cost-efficient since it is realized on traditional printed circuit board (PCB) technology. An equivalent circuit model of the proposed MSL-AFSIRW transition is presented and verified by full-wave simulation. To verify the proposed idea, a back-to-back transition is designed, fabricated and measured. After calibration, the measured return loss is higher than 15 dB from 54 to 69 GHz. The minimum of measured insertion loss is 0.25 dB at 65 GHz. The measured results show that the proposed design can provide low insertion loss around 60 GHz with low circuit fabrication cost. © 2020 IEEE.AFSIRW; AFSIW; MmWave; PCB; Slot coupling; TransitionEquivalent circuits; Insertion losses; Millimeter wave devices; Printed circuit boards; Substrate integrated waveguides; Circuit fabrication; Cost-efficient; Equivalent circuit model; Full-wave simulations; Low insertion loss; Measured results; Mm-wave application; Printed circuit boards (PCB); Ridge waveguidesconference paper10.1109/IMS30576.2020.92241212-s2.0-85094209338