Matching Network Topology Design of RF Circuit

The component topology required to convert any given impedance into 50 ohms depends on the measured impedance. The impedance can be measured using a vector network analyzer. The impedance must be measured at a very close to the matching network. When the measured impedance falls within a 50 ohm circle in the Smith circle, it requires a parallel inductor, then in series, one capacitor or a parallel capacitor, and then connects one inductor in series by the load, as shown below. Split elements can put the impedance on the 50 ohm circle. You can then use this series The component moves the impedance to 50 ohmot. Match the network topology when impedance is within 50 ohms When the measured impedance falls within 20 ms (mill Siemens) of the Smith Circle, it requires a series capacitance, followed by a parallel inductance, or a series inductor, then a parallel capacitor from the load, as shown below Show. Using a series component, the impedance can be on the 20-ms circle. Then, use a parallel component to bring it to a 20-ms (50-OHM) point. Impedance matching network topology used during 20 ms circle When the measured impedance falls outside the two circumferences, in the positive half of the Smith circle, you can use a series capacitor, then use a parallel inductor or a capacitor, or use a parallel capacitor, and then use a series inductor or load. Capacitors, as shown below. When the impedance is outside the two circles, the matching network topology used in the positive half of the Smith circle When the measured impedance falls outside these two circles, it can match the plurality of SMG, which can be matched in two ways: use the series inductance, then the inductance or parallel capacitance; or by using a parallel inductor Then, then the series inductance or capacitance from the load is matched, as shown below. When the impedance is outside the two circles, the matching network topology should be used when the Half part of the Smith circle Matching network prompts Use the following prompts to minimize the gap between the theoretical and practices in matching network design: ▪ Measure the impedance in the same point must be placed. ▪ Use cables and connector calibration network analyzers to set until impedance measuring points. ▪ Place the shunt element on the RF traveler. Do not use a longer trace to connect the splitter assembly. ▪ Select the series resonance frequency of at least twice the capacitance of the operating frequency. ▪ Select the inductance of at least twice the operating frequency. ▪ If parasitic impedance data is provided in the data table, use this data to derive the actual reactance of the component. ▪ Capacitors and inductors can only use high Q components. Since the impedance is usually unknown within the design time, the design of the three components of п or T method allows you to use all possible topologies later.