Microstrip bandpass filters with wide bandwidth and compact dimensions

✍ Scribed by Jordi Bonache; Ferran Martín; Ignacio Gil; Joan García-García; Ricardo Marqués; Mario Sorolla

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 173 KB
• Volume: 46
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20982

✦ Synopsis

GHz are for the notch frequency and the radiation patterns at 3.96 and 8.18 GHz are for the passband frequency. The measured radiation patterns at the passband frequency are about the same for the antenna both with and without the U-slot. The measured results show that the radiation patterns in the y-z plane are conical and the patterns in the x-z plane are nearly omnidirectional for all the measured frequencies.

Figure 8 shows the measured peak gain of the proposed antenna with and without the U-slot. The notches of 10 -12-dB magnitudes at 5.25 GHz have been created by inserting the U-slot. For the other frequencies outside the notch frequency band, the antenna gain is about the same for the antenna both with and without the U-slot.

4. CONCLUSION

A frequency-notched UWB planar monopole antenna with Lshape ground plane has been presented. The measured results show that a sharp frequency-band notch has been created very close to the centre frequency of the 5-GHz WLAN frequency band by inserting the half-wavelength U-slot.