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This paper proposes a compact power divider with simultaneous physical port isolation and wideband operation based on the simple Wilkinson power divider (WPD) configuration. Rigorous analysis based on the even-and odd-mode bisected networks has been performed to investigate the relationship between the design parameters and the overall performance. Theoretical analysis revealed that the impedance and isolation bandwidth are directly related to the reflection coefficients of the even-(e) and odd-mode (o) bisected networks. Simultaneous broadening of the impedance and isolation bandwidth is possible through the optimum choice of design parameters which confines the trajectories of the e and o in the low constant-Q region on the Smith Chart. Experimental verification by the prototype designed at 1 GHz exhibited the widest overall system bandwidth (43.2%) and the lowest total electrical length (140.8 o ) as compared to the previous state-of-the-art WPD's with physical port isolation.INDEX TERMS bandwidth; even-mode; isolation network; odd-mode; physical port isolation; Wilkinson power divider

This article presents a compact structure of two coupled transmission lines with two reactive loads for the tunable phase shifter using a printed-circuit board. The proposed circuit offers size reduction and wide phase shift range. The conventional reflection-type phase shifter approach has large total electrical length and high insertion loss. To overcome such technical issues, arbitrary-length two coupled transmission lines were introduced in this work. After optimising the length and the even-mode characteristic impedance of the coupled transmission lines, tuning the odd-mode characteristic impedance can decide the variation of two adjustable reactive loads. Based on the proposed structure, further discussion of the wideband tuning operation and measurement of the phase shift range with −20 dB return loss are addressed in this article. The fabricated circuit is measured at 700 to 2400 MHz. The even-and odd-mode characteristic impedance of two coupled transmission lines are 100-Ω and 70-Ω having about 2.16 dB maximum insertion loss, while maintaining 181-degree phase shift range and 40degree total electrical length of transmission lines at 700 MHz, respectively, providing about 78% to 89% size reduction compared with the previous research. Our data indicates that insertion loss, multi-band operation, and miniaturisation are superior to any published data. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.