Multiplexer, radio frequency front-end circuit, and communication device

A multiplexer comprising:

• a first 90° hybrid coupler that is connected to an antenna terminal, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the first 90° hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the first 90° hybrid coupler by approximately 90 degrees;
• a second 90° hybrid coupler that is connected to a terminating resistor, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the second 90° hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the second 90° hybrid coupler by approximately 90 degrees;
• a first filter connected to the first 90° hybrid coupler and configured to selectively pass a first radio frequency signal of a first pass band;
• and
• a second filter and a third filter, the second and third filters both being connected to both the first 90° hybrid coupler and the second 90° hybrid coupler, and both having the same filter characteristics,
• wherein the second filter and the third filter are band elimination filters configured to reflect the first radio frequency signal and pass a second radio frequency signal of a band other than the first pass band, low-pass filters configured to reflect a third radio frequency signal of a band including the first pass band and pass a fourth radio frequency signal of a band lower than the band of the third radio frequency signal, or high-pass filters configured to reflect a fifth radio frequency signal of a low frequency band including the first pass band and pass a sixth radio frequency signal of a band higher than the band of the fifth radio frequency signal.