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Indian Institute of Technology (IIT) Roorkee 
Highly-directional compact semicircular angular-phased antenna array in 9.35GHZ-42.89 GHz 
Amalendu Patnaik and Tushar Goel  
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2018-09-19 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
The present invention provides broadband, unidirectional, angular-phased array, 4-elements of the windmill-like shaped antenna are fed by Wilkinson power divider, and are configured in a novel semicircular-shaped, angular phased array. Phase difference among the antenna elements was introduced by providing angular path difference in the array, and it is adjusted so that array may always radiate in its end-fire direction. Total 21.5% of size reduction is achieved by introducing semicircular antenna array in reduction is achieved by introducing semicircular antenna array in comparison of the conventional linear-phased array. The semicircular antenna array of a radius of 65 mm, is designed for the operating frequency range from 9.35 GHz to 42.89 GHz, using Rogers RO4232 substrate with a thickness of 1.52 mm, and dielectric constant of 3.2. The array configuration maintains the average gain of 8.34 dBi in entire frequency range while exhibiting a peak gain of 12.17 dBi. By using antenna theory, it has also been analyzed that directivity and gain of single element antenna have been improved remarkably, by organizing such elements in the form of the semicircular array. Presented array structure exhibits highly directional behavior in the end-fire direction (ᶲ =90º), with the 3dB angular beam width in the range from 76.7º to <16.5º, which decreases as the frequency increase in the operating frequency range. 

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