| UAV | unmanned air vehicle | This is the future the air force whether they want to admit it or not. |
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| UCA | uniform circular array | One way to group antennas into an array. |
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| UE | user equipment | As in, a phone in a mobile network. Or the Unknown Editor. |
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| UGA | uniform grid array | Another way to group antennas into an array. |
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| ULA | uniform linear array | Yet another way to group antennas into an array. |
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| UUT | unit under test | See device under test. |
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| UVF | unverified failure | A test failure that occurred once but won't repeat, so you can't determine its cause. In the satellite business, any hardware with a UVF can't be launched without approval from the Chief Engineer, Customer, and insurance company. |
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| UWB | ultra wideband | several octaves. |
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