In a composite filter, first to third filters are connected to any ports of a first hybrid including a 90 hybrid coupler. The first filter has a first passband. The second filter and the third filter have a second passband that does not overlap the first passband. An electrical section from the first filter to the first hybrid is referred to as a first part. A combination of an electrical section from the second filter to the first hybrid and an electrical section from the third filter to the first hybrid is referred to as a second part. At least one of the first part or the second part does not include a matching network containing an inductor including a conductor of a multilayer substrate.

In a composite filter, first to third filters are connected to any ports of a first hybrid including a 90 hybrid coupler. The first filter has a first passband. The second filter and the third filter have a second passband that does not overlap the first passband. An electrical section from the first filter to the first hybrid is referred to as a first part. A combination of an electrical section from the second filter to the first hybrid and an electrical section from the third filter to the first hybrid is referred to as a second part. At least one of the first part or the second part does not include a matching network containing an inductor including a conductor of a multilayer substrate.