5.3 Rectangular patch antenna

The first part of the rectenna (part A) consists of a rectangular patch antenna with inset feed for matching and four CSRRs (complementary split ring resonator) in the other side (ground plane). This antenna covers the 5G range of frequency (28 GHz). This shape is chosen due to its simplicity and can be placed in the Franklin feeding line. Figure 31 shows the geometry of the rectangular patch with inset feeding. The final dimensions of the antenna after using optimization techniques of the CST simulator are introduced in Table 9. The L-C equivalent circuit of this antenna with CSRRs is shown in Figure 32. The rectangular patch is


### Table 6.

Circuit dimensional parameters [53].

represented as two radiating slots each one represented by a parallel R L C circuit, while each one of the four CSRRs represented by parallel LC and the electric coupling between the CSRRs on the ground and radiating patch on the top side is represented by capacitor Ck and the magnetic coupling represented by the mutual

The design of 5G rectangular patch antenna. (a) Front view, (b) back view, and (c) the dimensions of the

Figure 30.

Table 7.

Table 8.

Figure 31.

CSRR [53].

123

The equivalent LC circuit of the proposed 4G Franklin monopole antenna,

Passive Components for Ultra-Wide Band (UWB) Applications

DOI: http://dx.doi.org/10.5772/intechopen.88444

Dimensions of the proposed Franklin antenna (all dimensions in mm) [53].

C in Pico Farad, L in Nano Henry and R in ohm.

Franklin monopole antenna equivalent circuit parameters [53].

Lsub Wsub Lf Lg L d 35 45 18.5 14.9 5.1 9.9 R aWf Ws Tf Ts 1 1.1 1.6 1.5 13.4 14.9

CTL LTL Cp Lp Rp CS LS Ck Ccs 2 1.7 2606 0.0007 0.05 0.1 0.05 18.4 42.4

Figure 29. The design of the proposed Franklin strip monopole antenna (a) front and (b) back [53].

Passive Components for Ultra-Wide Band (UWB) Applications DOI: http://dx.doi.org/10.5772/intechopen.88444

Figure 30. The equivalent LC circuit of the proposed 4G Franklin monopole antenna,


#### Table 7.

stopband by adding new transmission zeros without increasing the circuit size. The

Part C of the multiband rectenna system is a Franklin strip monopole dual-band antenna to be used to cover Bluetooth at 2.4 GHz, 4G, LTE bands at 2.3, 2.5 and 2.6 GHz, WiMAX at 2.5 and 5.5GHz, WLAN at 2.4, 5.2 GHz [53]. The geometry of the antenna is shown in Figure 29. The antenna has a rectangular stub on a curved partial ground. The length of the bending strip is about one-half of the guide wavelength at its first resonance frequency. The meander radius and the length of the Franklin strip are mainly determining the two resonance frequencies of the antenna, while the rectangular stub with a length of a quarter wavelength and curved ground have been used to increase the bandwidth of the upper band

(5.5 GHz). The L-C equivalent circuit of the Franklin monopole antenna is shown in Figure 30. The dimensions of the antenna are shown in Table 7, while the equiva-

The first part of the rectenna (part A) consists of a rectangular patch antenna with inset feed for matching and four CSRRs (complementary split ring resonator) in the other side (ground plane). This antenna covers the 5G range of frequency (28 GHz). This shape is chosen due to its simplicity and can be placed in the Franklin feeding line. Figure 31 shows the geometry of the rectangular patch with inset feeding. The final dimensions of the antenna after using optimization techniques of the CST simulator are introduced in Table 9. The L-C equivalent circuit of

Parameter Cl L WCd1 Cd2 a11 a12 a13 a21 Value (mm) 17.6 2.4 0.15 7.6 2.1 1.35 0.2 0.05 2.9 Parameter a22 a23 X1 X2 Y1 Y2 T1 T2 W50 Value (mm) 0.15 0.05 2.4 1.8 0.8 0.8 3.2 3.8 1.6

this antenna with CSRRs is shown in Figure 32. The rectangular patch is

The design of the proposed Franklin strip monopole antenna (a) front and (b) back [53].

main dimensions are given in Table 6, all dimensions in millimeter.

5.2 Franklin monopole antenna

UWB Technology - Circuits and Systems

lent circuit parameters are shown in Table 8.

5.3 Rectangular patch antenna

Circuit dimensional parameters [53].

Table 6.

Figure 29.

122

Dimensions of the proposed Franklin antenna (all dimensions in mm) [53].


#### Table 8.

Franklin monopole antenna equivalent circuit parameters [53].

Figure 31.

The design of 5G rectangular patch antenna. (a) Front view, (b) back view, and (c) the dimensions of the CSRR [53].

represented as two radiating slots each one represented by a parallel R L C circuit, while each one of the four CSRRs represented by parallel LC and the electric coupling between the CSRRs on the ground and radiating patch on the top side is represented by capacitor Ck and the magnetic coupling represented by the mutual
