fiers, one for each branch. Both PCBs are made of Duroid substrate with permittivity r ϭ 2.2 and thickness 0.508 mm.Both prototypes are measured by using the commercially available HP8510C Network Analyzer. The output power is obtained by using the Rohode & Schwarz SMP02 Signal Generator and the HP8593E Spectrum Analyzer. Figure 5 compares the measured results of the two fabricated prototypes. The symbol "cross," which is given as "before" in the figure's legend, denotes the performance of the conventional multilayer active-slot power divider, whereas the item "after" in the legend denotes the measured results of the proposed multilayer active-slot power divider. The measurement results of port 3 are very similar to that of port 2; therefore, for the sake of brevity, they are not shown here.As observed from the figures, the proposed active-slot power divider exhibits superior performance, compared to that of the conventional multilayer power divider. As noted from the S 21 plot, a 52% bandwidth for the 3-dB bandwidth small-signal gain has been achieved with the proposed multilayer active power divider whereas the conventional multilayer power divider only has 40% bandwidth. This improvement in performance is mainly due to the fact that the added resistor helps to absorb the reflected power from the load termination of the lower circuit. Besides the good gain performance, good return loss of less than Ϫ15 dB for the S 22 has also been obtained.The power performance at 3.7, 5, and 6.4 GHz are plotted in Figure 5(d). Comparing to results in [7], there is not much difference in the P 1dB compression point. Also noted from the power plot in Fig. 4(d), the number of amplifiers used, as well as the PCB's substrate materials, actually limits the output power and the gain. Moreover, in our experimentation, it is noticed that the bandwidth of the amplifier unit governs the overall output bandwidth.
CONCLUSIONA novel multilayer active power divider has been designed, simulated and fabricated. Compared to the conventional, multilayer active power divider in [7], it is noted that a broader 3-dB bandwidth for the small-signal gain of about 52% has been obtained. The proposed modification also improves the output return loss of the overall active slot power divider.ABSTRACT: In this paper, a broadband coplanar waveguide (CPW)fed inductive slot antenna is presented. It consists of a conventional CPW inductive slot antenna and a CPW inductively coupled slot antenna in the feeding network. The experimental results provide the characteristic of excellent enhancement of impedance bandwidth (VSWR Ͻ 2). The impedance bandwidth of this broadband antenna can reach about 4.5 . Details of the antenna design and experimental results are discussed. ABSTRACT: A new method of dielectric-constant measurement is developed. The dielectric constant r of RF/microwave substrate is extracted by combining the microstrip ring resonator measurement with Ansoft HFSS electromagnetic simulation software. The developed method has two advantages: (i) charac...
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