![]() ![]() Γ, V incident, and V reflected are complex values. This is because the incident voltage will always be greater than reflected due to at least some power transfer to the load antenna, no matter how poor the match. The ratio between these two values, and consequently Γ, will always be greater than 0, but less than one. V incident is the incident voltage, V reflected is the reflected voltage. The antenna impedance, 30+j56, is plotted on a Smith chart and used to help determine the proper matching components and transform the load to match the 50 Ohm transmission line. In most cases, Z 0 is equal to 50 Ohms and does not have a reactive component. Z 0 is the characteristic impedance of the measurement system such as a network analyzer. As an example, the antenna impedance may be 30+j56. The value Z usually contains real and reactive components. Z is the input impedance of your system (for example, the impedance of the antenna you are trying to match). ![]() Impedance values (real and reactive) are plotted on a graph of Reflection Coefficient, Γ, using the following relationship: Smith ChartĪ Smith Chart is a graphical aid designed for RF engineers to solve transmission line and matching problems. Today we will review: Smith Chart, VSWR, Return Loss, and Γ or Reflection coefficient. The basic terms + definitions commonly used in antenna design and RF design are provided below.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |