Broadband Multi-Way Microstrip Power Dividers

Mitsuyoshi KISHIHARA  Kuniyoshi YAMANE  Isao OHTA  Tadashi KAWAI  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.1   pp.20-27
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.20
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
power dividers,  microstrip components,  multiport circuits,  Chebyshev transformers,  design automation,  

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This paper treats multi-way microstrip power dividers composed of multi-step, multi-furcation, and corners. Since the design procedure is founded on the planar circuit approach in combination with the segmentation method, optimization of the circuit configuration can be performed in a reasonable short computation time when applying the Powell's optimization algorithm. Actually, broadband 3- and 4-way power dividers with mitered bends are designed, and fractional bandwidths of about 90% and 100% are realized for the power-split imbalance less than 0.2 dB and the return loss better than -20 dB, respectively. The validity of the design results is confirmed by an EM-simulator (HFSS) and experiments.