scholarly journals Improved Beam-Scannable Ultra-Wideband Sparse Antenna Arrays by Iterative Convex Optimization Based on Raised Power Series Representation

2020 ◽  
Vol 68 (7) ◽  
pp. 5696-5701
Author(s):  
Yanhui Liu ◽  
Yuqi Yang ◽  
Feng Han ◽  
Qing Huo Liu ◽  
Y. Jay Guo
Keyword(s):  
Convex Optimization ◽  
Power Series ◽  
Antenna Arrays ◽  
Series Representation ◽  
Ultra Wideband ◽  
Power Series Representation

scholarly journals A radius of convexity problem

1981 ◽  
Vol 24 (3) ◽  
pp. 381-388 ◽  
Author(s):  
M.L. Mogra ◽  
O.P. Juneja
Keyword(s):  
Power Series ◽  
Unit Disc ◽  
Series Representation ◽  
Radius Of Convexity ◽  
Power Series Representation

The authors determine the sharp radius of convexity for functions analytic and starlike in the unit disc having power series representation of the form where an+1 is fixed. The estimate obtained is an improvement over the corresponding fixed second coefficient result. It is expected that this approach will lead to sharpening and improvement of a number of earlier known results.

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