1. 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)
報告人:
碩研電子一甲 MA 吳宗勳
Southern Taiwan University
Department of Electronic Engineering

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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