## 3 Results  
To demonstrate the proposed approaches, all the circuits designed with narrow-slit-loaded and meandered transmission lines were fabricated and tested. All circuits were simulated by using a full-wave electromagnetic simulator, Sonnet. First, experimental studies of the power dividers having narrow-slit-loaded transmission lines introduced in [28] are presented. Photographs of the manufactured N-way WPDs having narrow slits in [28] are shown in Figure 15. Figure 16 illustrates a measurement view, where 50-ohm loads were used to match the idle output ports for 4- and 8-way power dividers since the measurement device has only four ports. The measured results of the  
Figure 14: (**a**) Layout of a 5-way dual-layer WPD: (**b**) simulation results, (**c**) magnitude differences of S-parameters, and (**d**) phase responses. power dividers having narrow-slit-loaded transmission lines were compared with the simulated results in Figure 17[28]. It is obvious that the measured and simulated results are in very good agreement. In Figure 17a, the center frequency was 2 GHz at the 15 dB fractional bandwidth (FBW) of 36.26%. As can be seen from the figure, the return loss and isolation level were better than 15 and 20 dB within the FBW, respectively. Within the FBW, the minimum isolation level and insertion loss were approximately 29.56 dB at 2 GHz and 3.29 dB, respectively. The measured and simulated results of the 4-way WPD are illustrated in Figure 17b, with the return loss and isolation level of better than 15 and 20 dB, respectively. The center frequency was 1.8 GHz at the FBW of 94.44%, and the insertion loss was better than 3 + 0.5 dB. Moreover, the center frequency of the 8-way WPD was measured at 1.9 GHz at the FBW of 81.05%. The measured results were compared with the simulated ones in Figure 17c, where the insertion loss, return loss, and isolation level obtained were better than 9 + 0.5, 15, and 20 dB, respectively. there are two reflection zeros, since the circuit is composed of two cascaded sections. The measured magnitude and phase differences are also shown in Figure 20b,c, respectively. The simulated and measured results of the eight-way WPD are compared in Figure 21a and were found to be in very good agreement. In this case, three reflection zeros can be observed due to the utilization of three cascaded sections. The center frequency was measured at 1.73 GHz at the 15 dB FBW of 87.86%. Isolation levels between the output ports were better than 15 dB, 26 dB, 24 dB within the FBW, where the minimum insertion losses were 3.6 dB, 6.5, and 9.6 for 2-, 4-, and 8-way WPDs, respectively. The measured magnitude differences are shown in Figure 21b, with acceptable values smaller than 1 dB, and the phase differences can be observed in Figure 21c. Figure 17: Comparison of the measured and simulated results of the WPDs having narrow-slit-loaded transmission lines for a (**a**) 2-way WPD; (**b**) 4-way WPD; and (**c**) 8-way WPD. Figure 18: Meandered transmission line-based WPDs: (**a**) 2-way, (**b**) 4-way, and (**c**) 8-way. Figure 19: (**a**) Comparison of the measured and simulated results of the WPDs having meandered transmission lines for a 2-way WPD; (**b**) magnitude differences of S-parameters for a 2-way WPD; and (**c**) phase responses. Figure 20: (**a**) Comparison of the measured and simulated results of the WPDs having meandered transmission lines for a 4-way WPD; (**b**) magnitude differences of S-parameters for a 4-way WPD; and (**c**) phase responses. Meandered-transmission-line-based WPDs with alternative input/output port configurations were manufactured and tested for demonstration. A photograph of the two fabricated three-way WPDs is shown in Figure 22a. The frequency response of the designed power divider is depicted in Figure 22b. As can be seen from the figure, the designed circuit can serve within the frequency band of 1.5-2.0 GHz.