To miniaturize the overall size, all the stubs of SISR and SESR employ a bending structure. Multi-path coupling structure is achieved by stub-to-stub coupling of SISRs and SESRs. On the other hand, outer resonators SISRs operate at the first and second passband frequencies, i.e., f1andf2. And the SESRs operate at the third passband frequency f3.
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