With the advance of technology, the development and
application of wireless communication technologies have
become more diverse and comprehensive. From daily life
applications to medical care devices, wireless communication
technologies have been widely adopted, and one of the most
critical parts in wireless communications are antennas. Thus,
how to increase the efficiency and connection quality of
antennas has always been an important issue in discussions of
wireless communications. In [1–3], the antenna system
designs are concerned with improving the impedance by
adjusting frequency bandwidth with several simple methods.
Discussions of structures similar to the one presented here are
not involved, and the enhanced antenna directivity has never
been mentioned. The antenna system design in [4] resembles
that proposed in this research. With impedance frequency
bandwidth ranging 1–8 GHz, the proposed antenna had more
complex architecture, and could support the electromagnetic
wave transmission of wireless communication systems.
However, the proposed system suffered from the following
deficiencies: 1) A larger structure and