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It will also route signals at the receive frequency from the antenna to the LNA. For some systems, input and output signals are separated in time instead of frequency. In these systems, an RF switch is used instead of a duplexer. Matching elements and other passive frequency selective circuit elements are used internally to all of the components shown in the figure. 14. A signal received by the antenna is routed via the duplexer to the receive path of the radio. An LNA amplifies the signal before a mixer downconverts it to a lower frequency.

3 Sensors (Radar) Microwave sensor applications are addressed primarily with various forms of radar. Radar is used by police forces to establish the speed of passing automobiles, by automobiles to establish vehicle speed and danger of collision, by air traffic control systems to establish the locations of approaching aircraft, by aircraft to establish ground speed, altitude, other aircraft and turbulent weather, and by the military to establish a multitude of different types of targets. The receiving portion of a radar unit is similar to other radios.

These trends promise to both invigorate and reshape the field of microwave engineering in new and exciting ways. 3 Frequency Band Definitions The field of microwave and RF engineering is driven by applications, originally for military purposes such as radar and more recently increasingly for commercial, scientific, and consumer applications. As a consequence of this increasingly diverse applications base, microwave terminology and frequency band designations are not entirely standardized, with various standards bodies, corporations, and other interested parties all contributing to the collective terminology of microwave engineering.

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