US 12,224,473 B2
Polarized waveguide filter and antenna feeding circuit
Hidenori Yukawa, Tokyo (JP); Ryuya Seki, Tokyo (JP); Hiroto Ado, Tokyo (JP); Hiromasa Nakajima, Tokyo (JP); Yu Ushijima, Tokyo (JP); and Toru Takahashi, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Oct. 26, 2021, as Appl. No. 17/510,758.
Application 17/510,758 is a continuation of application No. PCT/JP2019/022030, filed on Jun. 3, 2019.
Prior Publication US 2022/0045412 A1, Feb. 10, 2022
Int. Cl. H01P 1/207 (2006.01); H01P 1/165 (2006.01); H01P 1/208 (2006.01); H01P 3/12 (2006.01)
CPC H01P 1/207 (2013.01) [H01P 1/165 (2013.01); H01P 1/2082 (2013.01); H01P 3/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A polarized waveguide filter comprising:
a first rectangular waveguide;
a second rectangular waveguide; and
a rectangular cavity resonator to excite a TE10 mode and a TE20 mode of an electromagnetic wave, the rectangular cavity resonator having a first edge surface connected to an electromagnetic wave exit plane of the first rectangular waveguide via a coupling unit, the rectangular cavity resonator having a second edge surface connected to an electromagnetic wave incident plane of the second rectangular waveguide via a coupling unit, the second edge surface facing the first edge surface, wherein
the rectangular cavity resonator has two first wall surfaces and two second wall surfaces each of which is narrower in area than the first wall surfaces, and
at least one protrusion to shift a resonance frequency of the TE10 mode and a resonance frequency of the TE20 mode by respective amounts different from each other is provided on at least one of the two first wall surfaces, in such a way as to protrude outward from the rectangular cavity resonator.