In this paper, single-feed square patch is chosen as
radiating element to generate right-hand circular polarization
wave. There are several structures to attain the goal[5], such as
the truncated comer structure applied in this paper as shown in
Fig.1, where the middle point L at the side denotes the feed
point location to generate LHCP wave and R the feed point of
RHCP wave. And a and l1a are the dimension parameters of
the patch shown in the figure. To obtain them, the total quality
factor Q should be found firstly. The total quality factor is
usually defined according to the quality factors related with various kinds of losses in the patch antenna.