Radio frequency module and communication device

A radio frequency module comprising:

• a mounting board that has a first main surface and a second main surface facing each other;
• a first acoustic wave filter that is disposed at the first main surface of the mounting board;
• a second acoustic wave filter that is disposed on the first acoustic wave filter;
• and
• a first shield electrode,
• wherein the first acoustic wave filter supports transmission or reception of a first communication band for time division duplexing (TDD),
• the second acoustic wave filter supports transmission or reception of a second communication band for TDD,
• a combination of the first acoustic wave filter and the second acoustic wave filter is a combination of a filter that supports transmission and a filter that supports reception,
• asynchronous communication is able to be performed in the first communication band and the second communication band,
• the first acoustic wave filter includes
• a first support member having a third main surface, and
• a first functional electrode provided at the third main surface of the first support member,
• the second acoustic wave filter includes
• a second support member having a fourth main surface, and
• a second functional electrode provided at the fourth main surface of the second support member,
• the first functional electrode and the second functional electrode are located in a hollow space formed between the first support member and the second support member in a thickness direction of the mounting board and face each other, and
• the first shield electrode is located in the hollow space and covers at least one of the first functional electrode or the second functional electrode.