Experimental investigation of antenna‐handset‐feed interaction during wireless product testing

Abstract

5.25 GHz, respectively. Measurements at other operating frequencies across the 2.4-and 5.2-GHz bands also show similar radiation patterns as shown in Figures 3 and 4, respectively, which indicates that the radiation patterns are stable in the two desired operating bands. Also notice that both the E and E components have comparable intensities. This characteristic is an advantage for the proposed antenna for WLAN or HIPERLAN operations, because their wave propagation environment is usually complex. In this case, comparable E and E radiation can decrease the effect of multiple-path fading and enhance the system performance. Figure 5 shows the measured antenna gain for frequencies across the lower and upper bands. The 2.4-GHz band has a peak antenna gain of about 2.8 dBi, and the gain variations are within about 1.3 dBi. On the other hand, the peak antenna gain of the 5.2-GHz band reaches about 3.1 dBi, and small gain variations (within about 0.5 dBi) are seen. CONCLUSIONSA novel low-cost, dual-band, surface-mountable monopole antenna has been proposed. The proposed antenna has two separate wide bandwidths covering the required bandwidths of WLAN (2.4-GHz band) and HIPERLAN (5.2-GHz band) systems. In addition, the proposed antenna is lightweight and can easily be constructed by folding a planar monopole made of a copper plate. Good radiation characteristics of the proposed antenna have also been observed.