Acoustic matrix diplexers and radios using acoustic matrix diplexers

A frequency division duplex (FDD) radio, comprising:

• a matrix diplexer, comprising:
• a common port configured for connection to an antenna, a low band port, and a high band port;
• n low band sub-filters, where n is an integer greater than one, each low band sub-filter having a first sub-filter port connected to the common port and a second sub-filter port connected to the low band port;
• n high band sub-filters, each high band sub-filter having a first sub-filter port connected to the common port and a second sub-filter port connected to the high band port;
• a first acoustic resonator connected between the common port and ground;
• and
• a second acoustic resonator connected between the low band port and ground, wherein
• the first and second acoustic resonators are configured to create respective transmission zeros adjacent to a lower edge of a passband of the diplexer;
• a transmitter having an output connected to one of the low band port and the high band port;
• and
• a receiver having an input connected to the one of the low band port and the high band port that is not connected to the transmitter.