Simplified approach for design of dual‐band wilkinson power divider with three transmission line sections

Abstract

The simplified design approach presented in this letter for realization of a dual‐band Wilkinson power divider (WPD) comprising of three transmission line sections reduces the mathematical complexity to half as compared to earlier presented work. Based on the mathematical derivation through even mode circuit analysis only, design guidelines are presented. Comparison is drawn between the new and the previous design guidelines. In order to show the efficacy of the proposed simplified design approach, a dual‐band WPD operating at 1 and 3 GHz is designed, simulated, and manufactured. The simulated and measured results show excellent conformance in the S‐parameter response. Measured figure of merits (FOMs) show good performance of the WPD. For instance, insertion loss comes out to be less than 3.3 dB, whereas return loss and isolation between the ports is better than −30 and −27 dB, respectively, at the two frequencies. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2374–2377, 2016

On the design of equal division single-band filtering dividers with an extended transmission line and resistor as isolation elements

“…BPFs have been used to replace the conventional λ g /4 transformers. It may be noted that to achieve effective output port isolation and RL in dual-band WPD, a 50 Ω extended TL of length l T L and a resistor R were used [11,12]. For the best possible functional response of the filtering PD, l T L and the tapping position of the output ports on the 50 Ω extended TL were optimized (optimization process is explained in detail in the related subsections).…”

“…However, the main difference here from our previous work is the challenge of effective BPF integration in place of TLs with simultaneous effective port isolation, which calls for a novel analysis approach altogether different from [11,12]. In this work, BPFs are designed first keeping the even/odd mode circuit requirements in mind and subsequently integrated in the PD.…”

“…In this work, in addition to a conventional 100 Ω resistor, an extended transmission line (TL) section of 50 Ω impedance is proposed as isolation element at the output ports for this purpose. In our previous works [11,12], a 50 Ω extended TL section and a 100 Ω resistor were employed in two-and three-transmission-line dual-band Wilkinson power dividers (WPDs) to achieve satisfactory S-parameters employing 2-port cascaded network analysis to calculate circuit parameters. In this work, the concept is extended to the filtering divider design.…”

Generalized design of a versatile tri‐frequency Wilkinson power divider

“…The WPDs are planar three‐port devices that split power equally or unequally with a good isolation between its matched output ports. It is pertinent to say that design of dual‐band WPD architectures have been widely reported 17‐27 in literature, and the focus has now shifted towards the design of tri‐band WPDs 28‐35 . Recently, there has been focus on designing WPDs with size miniaturization 36‐38 and harmonic suppression 38‐40 .…”

Design of Miniaturized Dual-Band Wilkinson Power Divider Using Dual and Cascade Pi-Shaped Transmission Lines

“…Researchers are giving more attention to design of multi-band WPD. Various methods are available in the literature which offers dualband WPD with improved performance such as, cascading two transmission lines [3], incorporating lumped element (R, L, C), but it offers additional parasitic effect especially at high frequency [4][5], stepped impedance [6], adding shunt stubs [7][8][9], extension of all ports [10], [11], shunt open-stubs with enhanced attenuation characteristics [12], three transmission line sections [13], and simplified approach for three transmission line sections [14] are recommended. However, the circuit size of a power divider becomes large specifically at lower frequencies due to the structural dependence on the quarter wave length (λ/4) line.…”