Control of Power Dividing Ratio in Four-Way Power Divider for Feeding Microstrip Comb-Line Antenna

Morihiko NANJO  Kunio SAKAKIBARA  Nobuyoshi KIKUMA  Hiroshi HIRAYAMA  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.10   pp.2651-2654
Publication Date: 2010/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2651
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
millimeter-wave,  array antenna,  microstrip antenna,  comb-line antenna,  

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A one-input four-way power divider is developed for feeding circuit of a microstrip comb-line antenna. The four-way power divider is composed of two-stage tournament-configuration of three Y-junctions. To control the sidelobe level and beam width in radiation pattern of the array, the power dividing ratio is assigned for the four-way power divider. Required dividing ratio is designed by changing the line width to control the impedance. To take impedance matching at the connection parts of the Y-junctions, 1/4-wavelength impedance-transformers are applied to the divider and taper structure is supplied at discontinuities. Four-comb-line antennas are designed and fabricated at 76.5 GHz. We evaluated sidelobe level and beam width by experiment to confirm the performance of the power divider.