A duplexer includes two surface acoustic wave filter having different band center frequencies, and a phase matching circuit that matches the phases of the two surface acoustic wave filters to each other. Data sessions from one or more servers or other data sources may be buffered over established pipes for delivery to a remote data host which likewise contains messaging control. Heating surfaces are inserted between the joint end faces. Biomolecular arrays that can be generated using focused acoustic ejection include oligonucleotide arrays and peptidic arrays. The user preference analysis method includes displaying content data on a screen of the device in response to a user input; recording content information about the content data displayed on the screen; analyzing a user preference based on the recorded content information; and storing a user preference analysis result for the content data. This allows reduction in the voltage applied between the first electrode portion and the second electrode portion, and it is thereby possible to form a desired electric field inside the periodically-poled structure while achieving a high-density channel arrangement.