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

Claim 0:
1. A filter device comprising
a post-wall waveguide functioning as a resonator group including n resonators R1, R2, . . . , Rn (n is an odd number not less than five) which are electromagnetically coupled together and which are congruent with each other,
the resonators R1, R2, . . . , R(n−1)/2 being configured such that (1) each resonator Ri (i=1, 2, . . . , (n−1)/2) 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> . . . >d(n−1)/2,
the resonators R(n+1)/2+1, R(n+1)/2+2, . . . , Rn being configured such that (1) each resonator Rj (j=(n+1)/2+1, (n+1)/2+2, . . . , 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 d(n+1)/2+1<d(n+1)/2+2< . . . <dn.