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We all check how many bars we have on our smartphones and assume it’s an accurate guide to how strong our signal is. But what do those bars really represent?There’s no standard. They do indicate signal strength, but it’s up to the handset manufacturer to come up with whatever algorithm they want. They certainly want to do something that is appropriate for the consumer, it needs to be meaningful in... more
Passive gain amplifies the signalAll antennas exhibit passive gain, which serves to amplify the signal. Passive gain is measured by the quantity dBi, which is the gain referenced to a theoretical isotropic antenna; an isotropic antenna transmits energy equally in all directions, and does not exist in nature. The gain of an ideal half-wave dipole antenna is 2.15 dBi. It should also be noted that as... more