Falih Mahdi ALNAHWI, Abdulghafor Abdulghafar ABDALHAMEED, Husham Lateef SWADI, Abdulkareem Swadi ABDULLAH
A compact wide-slot UWB antenna with reconfigurable and sharp dual-band notches for underlay cognitive radio applications
This paper presents a
compact wide-slot ultrawide-band (UWB) antenna with reconfigurable and sharp
dual-band notches compatible with the underlay cognitive radio systems. The
antenna slot and tuning stub are reshaped in such a way that the proposed antenna
operating bandwidth extends along the frequency band specified for UWB
applications (3.1-10.6 GHz). In spite of their sharpness, the generated band
notches perfectly cancel the interference with the entire 5 GHz wireless local
area network (WLAN) frequency band (5.15-5.725 GHz) and that of the military
X-band satellite communications downlink (7.25-7.745 GHz). The WLAN band notch
is presented by attaching a pair of quarter wavelength parasitic elements to the
antenna ground plane, while the other band notch is produced by engraving another
pair of half wavelength parasitic elements within the antenna wide slot along the
circumference of the antenna tuning stub. The reconfiguration of the band notches
is achieved by inserting a pair of PIN diodes for each pair of parasitic
elements. The simulated and measured results accentuate the UWB coverage of the
proposed antenna, and also verify the reconfigurability and the sharpness of the
antenna band notches. Moreover, the antenna has a noticeably stable radiation
pattern over the entire band of operation with omnidirectional pattern convenient
for portable UWB gadgets.
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- ISSN: 1300-0632
- Yayın Aralığı: Yılda 6 Sayı
- Yayıncı: TÜBİTAK
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