Yagi- Uda anteny są przydatne do wykorzystania in communication systems for their high gain and directivity. Obliczenia te parametry pomaga in designing effective antens for specific applications. This article explains thee basic methods to determinae gain and directivity in Yagi- Uda antens.

Dyrektywa w sprawie przejrzystości

Directive measures how focused the antenne 's radiation Pattern is in a particar direction. It is calculated by by comparing the maximum radium intention intensity to thee average radiation intensity over all directions. Hiper directivity indicates a more focused beam.

Te formuły for directivity (D) is:

(Antenna gain Pattern)

Kalkulating Gain

Gain combines the antenna 's directivity with its efficiency. It indicates how well thee antenna converts input power into radio waves in a specific direction. Gain is expressed in decibels (dBi).

Te formuły typical for gain (G) is:

Xivy1; FLT: 0 Xivy3; G = Directivity × Efficiency Xivy1; Xivy1; FLT: 1 Xivy3; Xivy3; Xivy3;

Efektywne rachunki for losses in thee antenna contents. For Yagi- Uda antens, efficiency is usually high, often above 80%.

Estimating Gain and Directivity

For practivations, the directivity of a Yagi- Uda antenna can be approximated using thee number of elements. A column approximation is:

(1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (3); (3); (3); (3); (3); (1); (1); (1); (1); (1) (1); (1); (1)

Kiedy nie ma żadnych elementów, które mogłyby być przydatne, nie ma potrzeby, aby były one dostępne.

  • Licz te liczby of elements in thee antenna.
  • Szacuje się, że w sposób bezpośredni użyto tej formuły przybliżonej.
  • Multipliczny difficity by efficiency to o find gain.
  • Express gain in decibels (dBi).