Log- periodic antennas are widely used in applications requiring broad frequency ranges. Understanding their gain and directivity is essential for effective design and deployment. This article explores practial methods to calculate these parametrs prequately.

Understanding Gain and Directivity

Gain measures how well an antenna directs radio frequency energiy in a specic direction compared to o an isotropic source. Directivity indicates thee concentration of radiated power in a particar direction. Both are kritial for assessinga antenna execurance.

Methods for Calculating Gain

Praktical calculation of gain involves empirical measuretts and theottical approximations. One common accach is to measure thee antenna 's radiated power in then far field and compe it to a reference sourcele. Alternatively, simation software can estimate gain based on fyzical parametrs.

Odhad Directivity

Directivity can be approximated using the antenna 's radiation pattern. For log- periodic antennas, thee pattern typically dispubs multiples lobes. Thee maximum radiation direction determinates the directivity, which ich can be calculated using thee formula:

CLANE1; CLANE1; CLANE1; CLANE3; CLANE3; Directivity = 4π / Solid angle of main lobe CLANE1; CLANE1; CLANE1; CLANE3; CLANE3c; CLANE3c;

Practical Tips

  • Use a calibated antenna for measuretts.
  • Perform measurements in an open area to minimize reflections.
  • Utilize simiration tools for initial estimates.
  • Srovnej výsledky with credirer specifications when in avalable.