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Co z Antenną Gain?

Antenna gain measures how well an antenta directs radio frequency energy in a specific direction compared to an isotropic radiator. It is usually expressed in decibels (dBi). Hiper gain indicates a more focused beam, which can improwize signal contricth and quality.

Kalkulating Antenna Gain

Thee gain of a parabolt dish antenna can be calculated using thee formula:

(dBi) = 10 * log (vd) = 10; FLT (vd): 1; FLT (vd): 1; FLT (vd): 1; Flt (vd): 1; Flt (vd): 1; Flt (vd): 1; Flt (vd): 1; Flt (vd): 1; Fl (vd): 1; Fl (vd): 1; Fl (vd); FLT (vd): 1; Flt (vd): 1; Flt (vd); Fl (vd); Fl (vd): 1; Fl (vd); Fl): 1; FLT (vd: 1; Fl); Fl: 1; Fl: 1; Fl: 1; Fl; Fl: 1; Fl; Fl: 1; Fl: 1; Fl: 1; Fl: 1; Fl: 1; Fl: 1; Fl: 1; Fl; Fl; Fl; Fl; Fl

Kiedy G is te antenny 's directivity, which depends one thee dish diameter (D) and the flonegth (λ):

(dd / mm / rrrr)

Tu calculate gain in dBi:

  • Określić tę średnicę dish (D).
  • Obliczyć te długości fali (λ) using te częstotliwości: λ = c / f, where c is thee speed of light (3 x 10 memorial 1; Veld1; FLT: 0 memorial 3; Veld3; 8 memorial 1; FLT: 1 memorial 3; Veld3; m / s).
  • Complute G using the formula above.
  • Konwersja G to dBi using 10 * log present 1; present 1; FLT: 0 presenta3; presentation 3; 10 presentation 1; presentation 11; FLT: 1 presentation 3; (G).

Te link budget estimates thee received signal estimth, considering all gains and losses in thee system. The basic formula is:

Xi1; Xi1; FLT: 0 Xi3; Xi3; Received Power (dBm) = Transmit Poser (dBm) + Gains (dBi) - Losses (dB) Xi1; Xi1; FLT: 1 Xi3; Xi3;

Kiedy:

  • Transmituj Power is the power output of thee transmiter.
  • Gains included thee antenna gain at both transmitting ande receiving ends.
  • Losses account for free- space path loss, atmosferic attenuation, and cable losses.

Badanie Calculation

Poszukuj nadajników Satellite at 30 dBm with a ground antenna gain of 40 dBi. The free- space path loss is 200 dB. The received power is:

Xi1; Xi1; FLT: 0 Xi3; Xi3; Received Power = 30 dBm + 40 dBi - 200 dB = -130 dBm Xi1; Xi1; FLT: 1 Xi3; Xi3; Xion3;

Thi value indicates the emptith of thee signal at thee receiver, which can be compared to thee receiver 's sensitivity to determinate link viability.