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faq:freedom-from-feedback [2015/04/21 16:25] hess [Freedom from Feedback] |
faq:freedom-from-feedback [2015/04/21 16:26] hess [Freedom from Feedback] |
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| ====== Freedom from Feedback ====== | ====== Freedom from Feedback ====== | ||
| - | As a theoretical rule of thumb, a good decoupling requires a distance of 5 to 10 λ.(([λ] Lambda = Wave length))\\ | + | As a theoretical rule of thumb, a good decoupling requires a distance of 5 to 10 λ.(([λ] Lambda = Wave length = v/f with v∼3×10<sup>8</sup> m/s.))\\ |
| However, in practive often a distance of 3 λ is sufficient. \\ | However, in practive often a distance of 3 λ is sufficient. \\ | ||
| \\ | \\ | ||
| - | <html> | + | |
| - | λ = v/f with v∼3×10<sup>8</sup> m/s. | + | |
| - | </html> | + | |
| At 2.1 GHz (e.g. UMTS) the formula returns 300'000'000/2'100'000'000 = 300/2100 = 0.14m. | At 2.1 GHz (e.g. UMTS) the formula returns 300'000'000/2'100'000'000 = 300/2100 = 0.14m. | ||