Abstract
A wideband antenna is designed based onQfactor in this paper. Firstly, the volume-surface integral equations (VSIEs) and self-adaptive differential evolution algorithm (DEA) are introduced as the basic theories to optimize antennas. Secondly, we study the computation ofQof arbitrary shaped structures, aiming at designing an antenna with maximum bandwidth by minimizing theQof the antenna. This method is much more efficient for onlyQvalues at specific frequency points that are computed, which avoids optimizing bandwidth directly. Thirdly, an integrated method combining the above method with VSIEs and self-adaptive DEA is employed to optimize the wideband antenna, extending its bandwidth from 11.5~16.5 GHz to 7~20 GHz. Lastly, the optimized antenna is fabricated and measured. The measured results are consistent with the simulated results, demonstrating the feasibility and effectiveness of the proposed method.
Highlights
Wideband communication systems have been drawing considerable attention among researchers and the industrial community due to the advantages provided by them such as high data rate, compact system size, and low power consumption
We find that expressions of the radiated power, timeaverage stored electric energy, and time-average stored magnetic energy are similar to the mother impedance matrix of the volume-surface integral equations (VSIEs), where functions and
In order to ensure that the antenna bandwidth is as wide as possible, we conduct the optimization of the Q at a few frequency points to obtain the minimum of the sum of the Q, and the corresponding antenna will have the maximum bandwidth theoretically
Summary
Wideband communication systems have been drawing considerable attention among researchers and the industrial community due to the advantages provided by them such as high data rate, compact system size, and low power consumption. Many researchers have designed varieties of ultra-wideband (UWB) antennas with good performance in recent years. As wideband antenna theory is not yet mature, its design is mostly based on experience with simulation software, which wastes much time. There are some researchers who have tried to design wideband antenna with numerical approaches and optimization algorithms. Ou et al [3] proposed a method combining genetic algorithm (GA) and the method of moments (MoM) to optimize wideband antenna. Kim et al [4] optimized an UWB antenna based on GA and finite-difference time-domain (FDTD). Antenna bandwidth is related to Q factor. This paper will start with the first resolution to increase antenna bandwidth by optimizing Q factor.
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