Smith of RFC

In the RF circuit design, it is also important to understand and use the Smith circle to draw a complex impedance graphic tool is also useful when designing a matching network. This tool allows you to quickly calculate many parameters, such as admission, echo loss, insertion loss, reflection coefficient, voltage stationer ratio (VSWR), and complex impedance transmission coefficients. It also allows you to calculate the impedance when the load is changed. Using Smith Circle, you can quickly design matching networks using RF Shortcrosslinked or RF Passive Devices. Please note the following: 1. The left corner of Smith is indicated by zero ohm, and the right corner indicates open. 2. The circle that contacts the right corner is a constant resistor circle. 3. The real part of the impedance is constant on all the points of the constant resistance circle. 4. The curve between the right corner of the Smith, the curve between the peripherals is a constant electrical anti-circle. 5. The impedance of impedance is constant at all points along the constant electrical anti-curve. 6. The circle that contact the left corner in the Smith circle is a constant electrical guide circle. 7. The real part of the admitted is unchanged along a constant conductivity. 8. The curve between the left and the edge of the smith circle and the edge of the Smith is constant. 9. The imaginary portion of the admitted is constant along a constant electrical curve. 10. The center of the circle is Z0. In our example, Z0 = 50 ohms. This is also a 20 milligara (MS) point. 11. Two special circles are 50-ohm circles and 20-MS circles The first step of impedance matching is to convert impedance to fall on a 50 ohm circle or 20-mS circle. The second step is to move the impedance from any circle to 50 ohms. The matching network topology also depends on the impedance to fall inside these circles or outside. Smith circle with impedance and guided circle

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