Broadband $E$ -Band WR12 to Microstrip Line Transition Using a Ridge Structure on High-Permittivity Thin-Film Material

A rectangular WR12 waveguide to microstrip line (MSL) transition using a very thin high-permittivity ceramic substrate (<inline-formula> <tex-math notation="LaTeX">$\varepsilon _{r} = 9.9$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$h = 127 \,\,\mu \text{m}$ </tex-math></inline-formula>) is presented and analyzed. The proposed configuration uses a gradually extending metal ridge over a thin-film MSL to ensure electric field transformation, and an accurate impedance matching, while maintaining a good electrical contact, without any soldering or gluing. The fabricated prototype has been successfully tested in terms of insertion and return losses. The obtained results exhibit a bandwidth of more than 37% at −10 dB with an insertion loss of 1.5–2.7 dB, over the entire 60–90-GHz frequency band. The design simplicity and suitability for high-permittivity thin-film substrates, as well as the very broadband operation capability, enable it to be easily integrated with various planar monolithic microwave integrated circuits/miniaturized hybrid microwave integrated circuits microstrip circuits for different millimeter-wave applications.

[1]  R. Maaskant,et al.  A Wideband Contactless and Bondwire-Free MMIC to Waveguide Transition , 2017, IEEE Microwave and Wireless Components Letters.

[2]  Patrick Reynaert,et al.  A Flip-Chip Packaging Design With Waveguide Output on Single-Layer Alumina Board for E-Band Applications , 2016, IEEE Transactions on Microwave Theory and Techniques.

[3]  P. Kildal,et al.  Design of a Simple Transition From Microstrip to Ridge Gap Waveguide Suited for MMIC and Antenna Integration , 2013, IEEE Antennas and Wireless Propagation Letters.

[4]  D. Jung,et al.  A Novel GCPW to Rectangular Waveguide Transition for 60 GHz Applications , 2009, IEEE Microwave and Wireless Components Letters.

[5]  Hiroyo Ogawa,et al.  Gap-coupled patch-type waveguide-to-microstrip transition on single-layer dielectric substrate at V-band , 2004 .

[6]  W. Shao,et al.  A Novel Waveguide-to-Microstrip Transition for Millimeter-Wave Applications , 2004 .

[7]  George E. Ponchak,et al.  A new rectangular waveguide to coplanar waveguide transition , 1990, IEEE International Digest on Microwave Symposium.

[8]  C.T.M. Chang,et al.  Equivalent Circuit for Partially Dielectric-Filled Rectangular-Waveguide Junctions , 1973 .

[9]  C. Hannachi,et al.  A new compact V-band six-port receiver for high data-rate wireless applications , 2015, 2015 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet).

[10]  C. Angulo.  Discontinuities in a Rectangular Waveguide Partially Filled with Dielectric , 1957 .