Int. J. Electron. Commun. (AEU) 61 (2007) 563 -567 天線工程期中報告 論文研討: Chao-MingWu, “Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application”, Int. J. Electron. Commun. (AEU) 61 (2007) 563 -567 報告人: 碩研電子一甲 MA030118 吳宗勳 Southern Taiwan University Department of Electronic Engineering

Abstract A novel and simple wideband dual-frequency design of a coplanar waveguide (CPW)-fed triangular planar monopole antenna is proposed. By the proper choice of the flare angle for the triangular patch and the gap distance for the CPW feeding structure, an additional resonant mode and wide impedance matching can be realized. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Antenna design L=30mm W=33mm θ=60° Wg =5mm Lg =8.1mm Wf=3mm d=7mm Wf corresponds to the 50Ω microstrip line. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Results and discussion Fig. 2 Shows the simulated and measured return loss against frequency for the proposed wideband dual-frequency triangular CPW-fed monopole antenna. Fig. 3 The gap width has a significant effect on the impedance matching performance of the proposed antenna for the upper band, while the matching condition of the lower band is insensitive to the variation of g. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Results and discussion Fig. 4 presents the measured results of the return loss against frequency with different flare angle for the proposed antenna. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Results and discussion Figs. 5–7 depict, respectively, the measured radiation patterns including the vertical (Eθ) and the horizontal (EΦ) polarization patterns in the azimuth cut (x–y plane) and the elevation cuts (y–z plane and x–z plane) for the antenna at lower band of 1.71 GHz, and at the upper band of 5.25, and 5.75 GHz. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Results and discussion Fig. 8. Measured antenna gain for frequencies across: (a) the lower band, (b) the upper band for the antenna studied in Fig. 2. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567

Conclusion A single-layer triangular planar monopole antenna based on 50- CPW-fed technology for obtaining two separate wide operating bands has been presented, with experimental and numerical results. prototypes suitable for spatial-diversity operation in the DCS 1800 and WLAN 5.2/5.8 GHz bands have been constructed and studied. C.-M. Wu /Wideband dual-frequencyCPW-fed triangular monopole antenna for DCS/WLAN application Int. J. Electron. Commun. (AEU) 61 (2007) 563 – 567