Patent ID: 11888203
Assignee: FUJIKURA LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A filter device comprising
a post-wall waveguide functioning as a resonator group including n resonators R1, R2, . . . , Rn (n is an even number not less than six) which are electromagnetically coupled together and which are congruent with each other,
the resonators R1, R2, . . . , Rn/2−1 being configured such that (1) each resonator Ri (i=1, 2, . . . , n/2−1) includes therein a control post CPi and (2) a shortest distance di from the control post CPi to a narrow wall of the resonator Ri satisfies d1>d2> . . . >dn/2−1,
the resonators Rn/2+2, Rn/2+3, . . . , Rn being configured such that (1) each resonator Rj (j=n/2+2, n/2+3, . . . , n) includes therein a control post CPj and (2) a shortest distance dj from the control post CPj to a narrow wall of the resonator Rj satisfies dn/2+2<dn/2+3< . . . <dn.