**Table 2.**

*Summary of the Sparameters of the stub.*

*Co-Design Block PA (Power Amplifier)-Antenna for 5G Application at 28 GHz Frequency Band DOI: http://dx.doi.org/10.5772/intechopen.98653*

#### **Figure 9.**

*Microwave amplifier without stage of transistor.*

#### **Figure 10.**

*Microwave amplifier with stage of transistor.*

S11 = S22, S12 = S21 Hence, the matching of the impedance is good, because the waves leaving the source and passing through the line are not partly reflected when they arrive on the load.

The design of the transistor amplifier is shown in the **Figures 9** and **10** above.
