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Radio Frequency Identification (RFID) is not a new technology, with the initial application being IFF (Identification Friend or Foe) used by aircraft during World War 2.
Printed circuit-board design has become quite complicated these days. One reason for this phenomenon is the increase in availability of commercial applications, many of which are wireless in nature.
Microwave components like antennas, filters, amplifiers and mixers are building blocks which are utilized in many existing defense weapons and Department of Defense (DoD) systems.