Get started
Work

Broadband s-band quadrature power divider using a two-section coupled-line and capacitively compensated Schiffman phase shifter

Year: 2026
Type: article
Abstract: A broadband quadrature power divider (QPD) operating in the S-band is presented based on the integration of a two-section coupled-line power divider and a capacitively compensated modified Schiffman phase shifter. The proposed structure combines the broadband power-division capability of the two-section coupled-line architecture with the phase equalization characteristics of the modified phase shifter to achieve stable quadrature operation over a wide frequency range. A systematic design methodology based on even–odd mode analysis is developed to synthesize both the coupled-line power divider and the phase-shifting network. The role of the capacitive compensation in improving phase balance and broadband performance is also investigated. The proposed QPD was designed, optimized, and validated through full-wave electromagnetic simulations and experimental measurements. Afterwards, a prototype was fabricated on a Rogers RT5880 substrate and measured utilizing a calibrated vector network analyzer. Measurement results demonstrate a 67% fractional bandwidth from 2 to 4 GHz with return losses better than 10 dB at all ports, insertion losses close to the ideal 3 dB power division level, isolation better than 13 dB, and a quadrature phase response maintained within 90° ± 5° across the operating band. The compact planar implementation occupies an area of 25 × 67 mm 2 and exhibits good agreement between simulation and measurement results. Owing to its broad bandwidth, stable phase response, and implementation simplicity, the proposed QPD represents a practical solution for broadband radar, beamforming, and phased-array applications operating in the S-band.
DOI: 10.1088/2631-8695/ae8b79
Institution: Aselsan (Turkey)
Language: English
Open Access status: bronze
OpenAlex ID: W7168375813
FWCI:
Cites: 1
Cited by:
Related to: 10