Multiband Sector Antenna with the Same Beamwidth Employing Multiple Woodpile Metamaterial Reflectors

Hideya SO  Atsuya ANDO  Tomohiro SEKI  Munenari KAWASHIMA  Takatoshi SUGIYAMA  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.10   pp.976-985
Publication Date: 2014/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.976
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-wave Technologies)
sector base station antenna,  multiband antenna,  metamaterial,  electromagnetic band gap (EBG) characteristics,  

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This paper proposes a sector base station antenna for mobile wireless communication systems employing multiple woodpile metamaterial reflectors and a multiband radiator that establishes the same beamwidth in the horizontal plane for more than two frequency bands. Electromagnetic Band Gap (EBG) characteristics of each metamaterial reflector can be controlled through structural parameters of the woodpile reflector, e.g., the rod width and rod spacing. As an example of the proposed antenna, a design for a triple-frequency-band antenna that radiates at 800 MHz, 2 GHz, and 4 GHz is shown. The algorithm used to adjust the beamwidth of the proposed antenna is newly introduced and adjusts the beamwidth to be the same for each band using the rod width of the woodpile. A prototype of the proposed antenna has the approximately 90° beamwidth in the horizontal plane at the three frequencies, and the measurement results agree well with the electromagnetic field simulation results.