US 12,272,857 B2
Waveguide microstrip line converter
Takashi Maruyama, Tokyo (JP); Shigeo Udagawa, Tokyo (JP); and Mitsuru Kirita, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/789,214
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009796
§ 371(c)(1), (2) Date Jun. 27, 2022,
PCT Pub. No. WO2021/176712, PCT Pub. Date Sep. 10, 2021.
Prior Publication US 2023/0035534 A1, Feb. 2, 2023
Int. Cl. H01P 5/107 (2006.01); H01P 5/02 (2006.01); H01P 5/10 (2006.01)
CPC H01P 5/107 (2013.01) [H01P 5/022 (2013.01); H01P 5/1022 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A waveguide microstrip line converter comprising:
a waveguide having an open end;
a dielectric substrate having a first surface and a second surface, the first surface facing the open end, the second surface being located on a side opposite to the first surface;
a ground conductor provided on the first surface and connected to the open end, a slot being provided in a region of the ground conductor, the region being surrounded by an edge of the open end;
a first conductor provided on the second surface, the first conductor being a line conductor through which a signal is propagated; and
at least one second conductor provided on the second surface, the at least one second conductor being located at a distance from the first conductor and adjacent to the first conductor, wherein
the first conductor includes a first portion, a second portion, and a third portion, the first portion being a microstrip line having a first line width, the second portion being located immediately above the slot and having a second line width larger than the first line width, the third portion extending in a first direction from the second portion and having a role in impedance matching between the first portion and the second portion,
the at least one second conductor is adjacent to at least part of the second portion of the first conductor,
the third portion includes a plurality of impedance transforming units, each of the plurality of impedance transforming units performing the impedance matching, and
one of the plurality of impedance transforming units that is connected to the second portion, has a line width larger than the second line width of the second portion.