**5. Co-design block PA-antenna**

The Co-Design Block PA-Antenna can be done with the greatest serenity because the impedances of the two equipment's comply with the principles listed above. The figure below therefore illustrates the proposed PA-Antenna Co-Design (**Figure 22**).

*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 21.** *S-parameters of amplifier with stage transistor.*


#### **Table 5.**

*Summary of amplifier parameters.*

The results obtained after simulation show us the following characteristics illustrated in the **Figure 23** below.

The S11 parameter clearly shows us that our Co-Design is functional and well suited to the resonant frequency. In this chapter we enumerate a method of designing a transmitter block namely the antenna and the amplifier it is important to note that the design of the block requires the partial design of each of the transmitters in


#### **Table 6.**

*Comparative analysis at the amplifier level.*

**Figure 22.** *Co-Design Block PA-Antenna.*

**Figure 23.** *Co-Design PA-Antenna Parameter S11.*

order to consider the design of the block. The design of the block takes into account the impedance adaptation parameters this as well as in this chapter we have arranged such that the amplifier and the antenna present at input as at output an impedance of 50 ohms thus facilitating the junction of the two block the proof **Figure 23** illustrates clearly and clearly that the block is functioning correctly and the impedances of the various equipment are in conformity with the fixed reference impedance.
