S11
**S11**
What is S11?
S11 is a common abbreviation for a specific type of radio frequency (RF) measurement parameter called the 'input reflection coefficient' or 'return loss'. It quantifies how much of the signal that is sent into a device or system is reflected back, rather than being transmitted or absorbed. A lower S11 value (more negative dB) generally indicates better impedance matching and more efficient power transfer into the device. It's commonly used in fields like antenna design, microwave engineering, and telecommunications to characterize components and systems.
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