A multiplexing system can include a first diplexer and a second diplexer. The first diplexer can be configured to filter a first transmit signal received at the first transmit terminal to a first cellular frequency band and output the filtered first transmit signal at the first common terminal. The first diplexer can be further configured to filter a first receive signal to a second cellular frequency band and output the filtered first receive signal at the first receive terminal input. The second diplexer can be configured to filter a second transmit signal received at the second transmit terminal to the second cellular frequency band and output the filtered second transmit signal at the second common terminal. The second diplexer can be further configured to filter a second receive signal to the first cellular frequency band and output the filtered second receive signal at the second receive terminal.