An antenna structure; top view and cross-sectional view. Unit in mm.  

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Context 1

... is divided into two and forms a hollow at the front. According to Iwasaki's study, making a cross-shape slot will help shift a second harmonic frequency to a bit higher frequency. Furthermore, the vertical and horizontal length of the cross-shape slot can be optimized to radiate wide-beam CP waves at the frequency based on Bolster's idea. Fig. 1 shows a structure of the antenna prototype. This antenna structure looks like the patch antenna reported by Iwasaki [7] and Shao [4]. However, there is a big difference between their radiation characteristics. The proposed antenna can radiate CP waves to its front side mainly not only at 920 MHz but also 2.45 GHz, although Iwasaki's ...

Context 2

... this section, characteristics of an antenna prototype designed through the three methods explained in Section 2 are discussed in detail. The measurements of the antenna prototype are shown in Fig. 1. First, S 11 characteristics of the antenna are shown in Fig. 2. There are four resonant frequencies in which S 11 is -10 dB or less. Impedance-bandwidths at around 920 MHz and 2.45 GHz are 20 MHz and 80 MHz, respectively. In Fig. 2, measurement results are compared with simulation results and are in good agreement. This shows the ...