The Surface Mount allows it to be used for RF Antennas in general.Tape & Reel (TR) solid enclosure protects the RF modulator.In most RF ic designs, it is qualified as a Surface Mount.
1600AT45A0040E Features
With Surface Mount
1600AT45A0040E Applications
There are a lot of Johanson Technology Inc. 1600AT45A0040E RF Antennas applications.