A novel compact microstrip bandpass filter using an open-loop resonator with radial stub

✍ Scribed by Jian-Xin Chen; Jun Xu; Quan Xue

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 108 KB
• Volume: 46
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20995

✦ Synopsis

GHz. For this reason, the spacing t was selected to be 1.0 mm for the prototype constructed here.

The radiation characteristics of the constructed prototype were also studied. Figures 7 and8 plot the measured radiation patterns at the center frequencies (2442 and 5500 MHz) for the 2.4-GHz and 5.2/5.8-GHz bands. In general, monopolelike radiation patterns are obtained. It is also seen that in the azimuthal plane ( x-y plane), the radiation with vertical or E polarization shows relatively small variations and is roughly close to being omnidirectional, especially for a lower frequency at 2442 MHz. Figure 9 shows the measured and simulated antenna gain over the impedance bandwidth for the constructed prototype. Good agreement between the measurement and simulation is observed. For frequencies up to about 4.5 GHz, the measured antenna gain is monotonically increased from about 2.4 to 5.2 dBi, while for higher frequencies from 4.5 to 6.0 GHz, the measured antenna gain varies in a relatively small range of about 4.6 -5.2 dBi.

4. CONCLUSION

A novel wideband metal-plate monopole antenna suitable for application as an internal or integrated WLAN/WMAN laptop antenna has been proposed. A constructed prototype of the proposed antenna capable of generating a wide operating bandwidth of 3.9 GHz for WLAN and WMAN operations has been successfully implemented. Good radiation characteristics for frequencies across the operating bandwidth have been obtained. The effects of the parameters of the proposed antenna on the impedance matching have also been analyzed.