I wish people would stop using "art deco" to describe things which aren't. Nothing much in the original Star Trek is art deco.
Of course, I didn't mean it literally, but more figuratively. Art Deco is a fairly abused term, used to apply to a wide range of design motifs that are either fully or partially influenced by the design aesthetics of the 20's and 30's. The phasers and communicators have rather minimalist qualities with various line accents that are similar to the streamline/minimalist motif of the Art Deco period. Remember Dax saying "I love classic twenty third century designs. Black finish, silver highlights." That silver metal center line wrapping around the black body of the communicators certainly echos a minimalist design.