**3.2 Design of array of circular miniature printed antenna**

#### *3.2.1 Antenna array geometry*

We are going to make our antenna network (**Figure 20**) from the previous antenna with some modifications in terms of the parameters and its values in order to have the desired results (**Table 4**).

#### *3.2.2 Simulation results*

S11 parameter:

In **Figure 21,** we see that the coefficient S11 is of the order of −42 dB for a resonant frequency of 6.08 GHz, we obtained exactly the bandwidth that interests us, which is [2.7 10.6 GHz] [18].

**Figure 19.** *Gain diagram with effect of the antenna slot location.*

**Figure 20.**

*Antenna array structure.*


#### **Table 4.**

*Dimensions of the array antenna.*

**89**

**Figure 24.** *Directivity diagram.*

*Design of a UWB Coplanar Fed Antenna and Circular Miniature Printed Antenna for Medical…*

**Figure 22** gives us the variation of the gain of our antenna as a function of the frequency. Note that the gain has increased to 7.6 dBi on the frequency band [3.1– 10.6 GHz]. This networking of antennas has allowed us to increase the gain [19]. At the frequency of 6.14 Hz in **Figure 23** (Gain Diagram) and **Figure 24** (Directivity Diagram), we can say that the radiation is focused on both sides of the

*DOI: http://dx.doi.org/10.5772/intechopen.93205*

Gain:

**Figure 22.**

**Figure 23***.*

*Gain diagram of array antenna.*

*Gain diagram of array antenna.*

**Figure 21.** *Return loss of array antenna.*

*Design of a UWB Coplanar Fed Antenna and Circular Miniature Printed Antenna for Medical… DOI: http://dx.doi.org/10.5772/intechopen.93205*
