![]() ![]() The values for reactance depend on signal frequency in Hertz (Hz) and the inductor/capacitor values, L and C in Henries and Farads respectively. For antennas, reactance is generally undesirable as it does not contribute any energy to the emitted radiation. Real antennas contain both resistance (often referred to as radiation resistance) and some reactance. If reactance X was zero (for example in a simple resistor), the impedance will be a pure resistance. The impedance, resistance and reactance unit is in ohms (Ω) and the reactance jX, with the complex operator, indicates the reactance has an orthogonal relationship to the resistance value as you will see later. ![]() The article explains that impedance Z contains reactance X and resistance R denoted by the following formula: ![]() In the previous article, " Impedance and Standing wave ratio", we touched on impedance in relation to antennas. Derivationīefore introducing the Smith Chart, first we need to understand circuit impedance. His solution was the Smith Chart which is still widely used today. The Smith Chart was conceived by Philip Smith, an engineer at Bell Laboratories in the 1930s - in an attempt to avoid the complex calculations associated with RF design and to obtain solutions more quickly. A Smith Chart being shown electronically. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |