Evolutionary Design of a Crooked-Wire Antenna

This paper presents a new crooked-wire antenna. The antenna design is first modeled as a constrained optimization problem (COP). Then a differential evolution solves the COP. Consequently, an antenna is designed. The main difference of the antenna design in this paper from traditional evolutionary antenna is that the objective in the COP can potentially enhance the robustness of the antenna and widen the frequency band without additional computational cost. Actually, the objective is the sum of variance of the gain, axial ratio and VSWR over the frequency band. This paper chooses NASA LADEE satellite antenna design as an example to verify the method of this paper. The performance of the evolved antenna meets the requirements. Furthermore, the VSWR of the antenna is less than 1.5 over the required frequency range, much less than the requirement 2. The axis ratio is 2.06 dB at the beam direction which is much better than that of the antenna designed by the referred literature.