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A self-adaptive hybrid differential evolution algorithm is proposed to optimise linear aperiodic arrays with a minimum peak sidelobe level. The proposed method incorporates a local search operation into a differential evolution (DE) algorithm to accelerate its convergence rate. Moreover, the self-adaptive parameter control approach is employed to avoid tuning the parameters of the DE algorithm. Synthesis examples are compared with the linear aperiodic array designs in the literature. Numerical results demonstrate that our approach is superior to existing algorithms in terms of the high-quality solutions and relatively small computational cost. [ABSTRACT FROM AUTHOR]

A reconfigurable band-notched ultra-wideband antenna is proposed. The antenna mainly consists of a modified rectangle radiating element, a staircase ground plane and two simple pin diode switches, and its entire size is 33.0×28.0×1.0mm. The presented antenna has nearly omnidirectional patterns, stable gain, small group delay and an available impedance bandwidth ranging from 3.1 to 12.5 GHz, including dual band-notched bands centred at 3.5 and 5.5 GHz, respectively. By reconfiguring the states of pin diode switches, the dual notched bands can be reconfigurable. That is to say, the reconfigurable antenna is able to switch among four operative modes (none or 3.5GHz or 5.5GHz or dual band-rejected). [ABSTRACT FROM AUTHOR]