Abstract
We present a compact ultra-wideband (UWB) antenna integrated with sharp notches with a detailed analysis of the mutual coupling of the multiple notch resonators. By utilizing complementary split ring resonators (CSRR) on the radiating semi-circular patch, we achieve the sharp notch-filtering of various bands within the UWB band without increasing the antenna size. The notched frequency bands include WiMAX, INSAT, and lower and upper WLAN. In order to estimate the frequency shifts of the notch due to the coupling of the nearby CSRRs, an analysis of the coupling among the multiple notch resonators is carried out and we construct the lumped-circuit equivalent model. The time domain analysis of the proposed antenna is performed to show its validity on the UWB application. The measured frequency response of the input port corresponds quite well with the calculations and simulations. The radiation pattern of the implemented quad-notched UWB antenna is nearly omnidirectional in the passband.
Highlights
Ultra-wideband (UWB) antennas have widely drawn considerable attention since the FederalCommunication Commission (FCC) in the USA assigned the frequency range from 3.1 to 10.6 GHz to UWB wireless indoor communication applications
We present an ultra-wideband (UWB) antenna integrated with complementary split ring resonators (CSRR) notching resonators at WiMAX, Indian national satellite (INSAT), and lower and upper wireless local area network (WLAN) bands, each of which is placed nearby that has strong coupling among them
The corresponding mutual couplings among each CSRR were analyzed with the help of the Babinet principle
Summary
Ultra-wideband (UWB) antennas have widely drawn considerable attention since the Federal. The proposed antennas with etching slots have the undesirable wideband rejection characteristics from 5 GHz to 6 GHz other than the desirable narrowband notch at 5.15–5.35 GHz and 5.70–5.825 GHz for lower WLAN and upper WLAN bands, respectively. Due to this reason, the UWB system may lose any essential data, which results in a bad quality of the received signals and degradation of the received signal within the range of 5.35–5.70 GHz. in [11] three resonating elements were constructed on top of the modified ground plane to achieve tri-band notching and reduce coupling between the resonators.
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