Design of high-performance miniaturised circular slotted microstrip power dividers

Abstract

Creating annular slotted rings within the circular microstrip patch power divider facilitates the realization of a new power divider configuration, which provides multifaceted features like miniaturization, decreased insertion loss, increased isolation, and fractional bandwidth enhancement, which collectively imbue the device with heightened operational efficacy. The present manuscript delineates the configuration, evaluation, analysis and design of these centre-fed Circular Slotted Power Dividers (CSPDs) endowed with annular slotted rings that have been engineered to function with superior efficacy.An analytical framework has been proposed for prognosticating the operational characteristics and design details of the proposed microstrip power divider by combining the known behaviour of its two component structures, namely, the inner Circular Micro-Strip Structure (CMSS) and the outer Annular Micro-Strip Structure (AMSS). The validity and accuracy of this framework have been ascertained by means of numerical simulations as well as practical measurements of the fabricated CSPDs. In addition, a parametric analysis is conducted to scrutinize the effects of varying the permittivity of the substrate, the circular radius, the annular ring radii, and the annular ring width, on the power divider's operational parameters. The insights gleaned from this analysis are subsequently utilized to optimize the proposed mathematical design procedure of the CSPDs.Furthermore, the manuscript expounds upon the assessment of the influence of multiple annular rings incorporated within the CPDs on further miniaturization and enhancement of the bandwidth. These enhanced structures are named as CSPD with Dual Slotted Rings (CDSR).