Compact CPW‐fed planar monopole antenna for dual‐band WLAN applications

Abstract

ABSTRACT:A compact and simple monopole antenna with CPW-fed structure is proposed for application in dual-band WLAN systems. The proposed antenna, which resembles the shape of the letter "e", has a compact size of only 27 ϫ 18 ϫ 1.6 mm 3 including the ground. By fabricated and measured, the proposed antenna covers both 2.4 and In this letter, we present a novel compact CPW-fed antenna resembling the shape of the letter "e" to satisfy for 2.4/5 GHz WLAN applications (2.4 -2.484 GHz for IEEE 802.11b/g and 5.15-5.825 GHz for IEEE 802.11.a). Compared with those reported, the proposed antenna has simple structure and compact size, moreover, can provide good monopole-like radiation patterns for both bands. Details of the antenna design are described, and both simulated and measured results are presented. ANTENNA DESIGNThe geometry and dimensions of the proposed antenna for dualband WLAN operations is shown in Figure 1. For the design studied here, the antenna is fabricated on the FR4 substrate of relative permittivity r ϭ 4.4 and substrate thickness h ϭ 1.6 mm, . The antenna is fed by a 50 ⍀ CPW transmission line, which consists of a signal strip width of 3.6 mm and a gap distance of 0.4 mm between the single strip and the coplanar ground plane. The dual-band operation of the proposed antenna is achieved by the dual resonant structures. As shown in Figure 1, the two resonant paths for 2.4 and 5 GHz bands are the whole path of the proposed antenna and path1, respectively. In addition, the very monopole-like radiation patterns for 5 GHz band can be obtained by the approximate symmetry of the path1 with respect to the x-direction. The parameters of the proposed antenna are designed by using Ansoft's high frequency structure simulator (HFSS). The measured antenna is connected to the cable by a coaxial SMA connector, which is taken into account in the simulation. RESULTS AND DISCUSSIONThe proposed antenna has been constructed and experimentally studied. The simulated and measured return losses obtained by using Ansoft's HFSS and Aglient8363B vector network analyzer, respectively, are shown in Figure 2, together with the simulated one for the antenna with path1 only. From the curves (i) and (iii) in Figure 2, it is seen that dual resonant modes are excited by the path1 and the whole path of the proposed antenna, respectively. In the 2.4 GHz band, the measured 10 dB bandwidth is about 160 MHz (2.36 -2.52GHz) or 6.6% referred to the centre frequency of 2.44 GHz, which is sufficient to cover 2.4 GHz band. In the 5 GHz band, the measured 10 dB bandwidth is about 3820 MHz (4.07-7.89 GHz) or about 63.9% referred to the centre frequency of 5.98 GHz, which also meets the bandwidth requirement for 5 GHz band. These results agree well with the simulated results.The measured y-z plane and x-y plane radiation patterns are shown in Figure 3. It is seen that the radiation pattern for E polarization in the y-z plane is almost omni-directional at the frequency of 2.44, 5.2, and 5.8 GHz. In the x-y plane, the radiation patterns for E pola...

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