Abstract
According to federal communication commission (FCC) rules, the 3.1 - 10.6 GHz band is allocated to the amateur ultra wideband (UWB) applications. On the other hand, the 5.15 - 5.825 GHz band is associated with the wireless LAN (WLAN) applications according to IEEE 802.11 and HIPERLAN/2 standards. Therefore, an unwanted intrusion will be expected between these two frequency requests. In This paper a comprehensive review will be done over a wide range of UWB microstrip antennas which all have the band notching property over the WLAN band to effectively avoid this interference. All the band notching techniques in the recent papers will be categorized in 4 distinct methods including the tuning stub, the shaped slot, the parasitic element, and the fractal geometry. A few typical papers will be introduced and evaluated in each category for declaration purposes. At last, a comparison will be done between these methods and the relative papers.
Highlights
Ultra wideband technology has been used in a wide range of applications such as radars, telemetry, navigation, biomedical systems, mobile satellite communications, the direct broadcast system (DBS), global positioning systems (GPS), and remote sensing
The 5.15 - 5.825 GHz band is associated with the wireless LAN (WLAN) applications according to IEEE 802.11 and HIPERLAN/2 standards
As a matter of fact, amateur ultra wideband (UWB) systems might cause an interference with WLAN applications which ought to be considered as a serious factor in any UWB system design
Summary
Ultra wideband technology has been used in a wide range of applications such as radars, telemetry, navigation, biomedical systems, mobile satellite communications, the direct broadcast system (DBS), global positioning systems (GPS), and remote sensing. Many techniques like using a pair of notches at the lower corner of the patch [1], inserting a slot in the tapered radiating element [2], meandered ground plane [3], multi-folding techniques [4], stack shorted patch [5,6], using elliptical slot [7], and other techniques [8,9] have been reported to obtain wideband and small size of microstrip antennas These ultra wideband antennas are mainly designed to transmit and receive short electromagnetic energies. It will be shown that, methods like using tuning stub, inserting shaped slot, using parasitic element, and implementing fractal geometry have been reported to reach this purpose
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