Abstract
A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.1–10.6 GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5 GHz and 5.5 GHz, respectively.
Highlights
UWB technology has received great attentions from both the academic and the industrial sectors since the US Federal Communications Commission (FCC) authorized the unlicensed use of UWB from 3.1 to 10.6 GHz for commercial communication purposes
The modified electromagnetic-bandgap (M-EBG) consists of two L-shaped strips with different dimensions
The design method is performed by placing the M-EBG structure closed to the microstrip feedline; two required notched bands at wireless local area network (WLAN) and WiMAX are achieved
Summary
UWB technology has received great attentions from both the academic and the industrial sectors since the US Federal Communications Commission (FCC) authorized the unlicensed use of UWB from 3.1 to 10.6 GHz for commercial communication purposes. As an important component of UWB system, UWB antenna has attracted increasing attentions. A number of UWB antennas with different geometries have been experimentally characterized [1,2,3,4]. Planar monopole antennas are considered as good candidates for UWB applications due to their attractive merits, such as large impedance bandwidth, easy fabrication, and omnidirectional radiation pattern [5]. Many kinds of UWB planar antennas are designed to satisfy the requirements of UWB operation. In practical applications, some other existing narrowband services that already occupy frequencies in the UWB may cause potential interference, for instance, WiMAX for some European and Asian countries (3.3–3.6 GHz) and WLAN for IEEE802.11a in the USA
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