DIPLEXER AND MULTIPLEXER

摘要

A diplexer (100) includes: first and second directional couplers (106A, 106B); and first and second filters (101A, 101B). The filters (101A, 101B) each include a plurality of resonators (110A to 150A, 110B to 150B) that are electromagnetically coupled. The resonators (110A to 150A, 110B to 150B) each have a broad wall that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the resonators (110A to 150A, 110B to 150B) are arranged such that DR₁+R₂ is satisfied, where R₁ and R₂ represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.