An Optimized Isolation Network for the Wilkinson Divider

Abstract

Cataloged from PDF version of article.We propose an isolation network to simultaneously\ud improve the input return loss, output return loss and isolation of\ud the Wilkinson power divider in a wide bandwidth. The required\ud even mode and odd mode reflection coefficients of the isolation network\ud are calculated. Constructed even and odd mode circuits are\ud combined to give the desired isolation network. Analytical expressions\ud for the optimal component values for a single-section divider\ud are given. Compared with the single-section Wilkinson divider, the\ud final design can triple the bandwidth for an input-output return\ud loss and isolation of greater than 25 dB. Broadband characteristic\ud is achieved without increasing the number of sections hence extra\ud length and insertion loss are avoided. Wide operation bandwidth\ud of the new divider is verified by experimental results. The proposed\ud method can be applied to a two-section divider, also broadening its\ud bandwidth

Compact and Wideband CPW Wilkinson Power Dividers for GaN MMIC Applications

“…3-port calibration and measurements are performed using Cascade 1 RF wafer probe station, GGB 2 GSG150 picoprobes and R&S 3 ZVA40 vector network analyzer. Simulation results 4 and measurement results of the dividers are in good agreement. Figs.…”

“…Although the Wilkinson power divider is preferred for monolithic microwave integrated circuits (MMIC) due to its ease of fabrication and planar structure, it is not useful in wideband applications and consumes valuable chip area because of its quarter-wave length arms. In order to address the first issue and improve the bandwidth, multisection hybrids with a number of cascaded transmission line arms and bridging resistors [2] and a modified isolation network with a series RLC circuitry [3], [4] have been proposed. Regarding the second issue to reduce the circuit size, lumped element π-network and T-network equivalents of the quarter-wave length arms [5], [6] and capacitive or inductive line loading [7], [8] have been suggested.…”

A theoretical design of ultra‐wideband multisection Wilkinson power divider using Euler polynomials

“…In other words, the line thicknesses of the second and third output ports are equal to each other. Thus, the line characteristics are also equal 17 . Figure 1A,B show simulated and manufactured circuit of the conventional QW WPD.…”

Ultrawide isolation bandwidth compensated power divider for UWB applications

“…The isolation network technique, reported in Ref. [8], involves the use of several lumped elements. Unfortunately, it would be challenging to implement this technique at frequencies higher than 3 GHz due to the parasitic effects associated with the lumped elements.…”

“…Another approach for improving the isolation bandwidth of PDs is to optimise the isolation network. 8 Specifically, the isolation resistor in a conventional WPD is replaced by an isolation network. This approach suffers from the disadvantage of requiring several lumped elements which increases complexity.…”