Design of Multi-Way LC-Ladder Dividers with Multi-Band Operation

Yosuke OKADA  Tadashi KAWAI  Akira ENOKIHARA  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.10   pp.893-900
Publication Date: 2017/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.893
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
power divider,  LC-ladder circuit,  multi-band,  multi-division,  

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In this paper, we propose a design method of compact multi-way Wilkinson power divider with a multiband operation for size reduction and band broadening. The proposed divider consists of multisection LC-ladder circuits in the division arms and isolation circuits between the output ports. To validate design procedures, we fabricated a trial divider at VHF band. The circuit layout of the trial divider was decided by using an electromagnetic simulator (Sonnet EM). Because the proposed divider consists of lumped element circuits, we can realize great miniaturization of a circuit area compared to that of the conventional Wilkinson power divider. The circuit size of the trial divider is 35 mm square. The measurement results for the trial divider by using a vector network analyzer indicates a relative bandwidth of about 60% under -17 dB reflection, flat power division within ±0.1 dB, and very low phase imbalances under 1.0 degree over the wide frequency range.