Applications and Antenna Selection in the 4.9 GHz Band

摘要

A variety of commercial, governmental and military applications utilize the 4.40 to 4.99 GHz band. In the US and NATO countries, the 4.4 to 4.5 GHz band is designated for military fixed and mobile communications such as point-to-point microwave links and telemetry applications such as unmanned aerial vehicles (UAV), commonly known to the general public as drones. In the 4.635 to 4.685 GHz band the United States Navy operates the Cooperative Engagement Capability (CEC) network, which is a radar information distribution network. There is also a radio astronomy service (RAS) globally allocated on a secondary basis in the 4.80 to 4.94 GHz band. More recently, the FCC allocated 50 MHz in the 4.940 to 4.990 GHz band for public safety applications. Any state or local government agency including municipal utilities can utilize this "new" band on a shared basis. Communication networks deployed in the 4.940 to 4.990 GHz band must be related to the protection of life, health or property and cannot provide services that arernotherwise commercially available to the public. These communication networks specifically serve state and local governmental organizations such as police, fire, and search and res-rncue. Figure 1 is a diagram showing these frequency allocations.