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IP.com Disclosure Number: IPCOM000250374D
Publication Date: 2017-Jul-06
Document File: 4 page(s) / 830K

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The IP.com Prior Art Database


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Benito Lopez Keysight Technologies, Inc.


Wilkinson power dividers (WPDs) are widely used for splitting the power of an input signal into multiple outputs. A WPD is a bidirectional passive component that can also function as a power combiner in the reverse direction. Figure 1 shows a typical three-port WPD circuit with a pair of quarter-wave (λ/4) impedance transformers coupled together with a resistor that provides isolation between the output ports. Each pair of λ/4transformers and isolation resistor are referred to as a section. The conventional WPD shown in Figure 1 consists of a single section and has a usable bandwidth that is typically limited to f2/f1 = 1.44:1 for a voltage standing wave ratio (VSWR) < 1.22 and an isolation >20 dB.

A new class of multiple-section WPDs has been developed, providing an enormous improvement in VSWR and output isolation that cover a broader bandwidth. The theoretical design formulas for the multiple section WPD are described in detail in Reference [1]. As the number of sections increase, the bandwidth capability improves. However, the increase in the number of sections typically results in larger physical size and poses a problem in printed circuit board (PCB) assemblies.


            The present disclosure provides a low-cost compact design for an ultra-broadband power divider based on an eleven-section WPD, with capability to operate at 0.3 – 6 GHz (f2/f1 = 20:1).  Figure 2 shows the circuit design of the WPD having eleven sections. Each of the sections is connected in series and has a respective pair of λ/4 transformers (Z) symmetrically coupled with an isolation resistor (R). The circuit design leverages curving lines for all the quarter-wave transformers (Z1Z11) instead of conventional straight lines to achieve higher compact physical layout having intrinsic dimensions of 2 cm × 4 cm.   

            In this exemplary embodiment, the substrate material of the PCB used is MEGTRON6 with nominal thickness of 0.55 mm. Computer simulation provides the optimized impedance values of the isolation resistors (R1R11) and the characteristic impedance of the λ/4 transformers (Z1Z11). The values are provided in Table 1....