Abstract-This article describes a compact UWB chip antenna using the coupling concept. The inclined slot is inserted on the rectangular radiating patch of the UWB chip antenna. From experimental results, the measured impedance bandwidth of the antenna (defined by −6 dB return loss) is 2.5 GHz (3-5.5 GHz). Also, the proposed antenna exhibits good radiation patterns with small gain variation (2.5-3.5 dBi) in the operating frequency band. Details of the proposed antenna design and the simulated and measured results are presented and discussed.

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fabrication process. The predicted and measured frequency responses of the S-magnitude are shown in Figure 5 and illustrated in good agreement with each other. The measured 1 dB passband is in the range of 4.6-5.1 GHz and its measured return loss is less than À14 dB. The upper-stopband in experiment is greatly extended up to 25 GHz with an insertion loss larger than 20 dB. CONCLUSIONSIn this work, a compact BPF with good in band and wide upper-stopband performances is proposed and designed using the open stub loaded dual-mode resonator. The advantageous feature of the dual-mode resonator is that the even-mode resonance frequency can be controlled exclusively by the discshaped open stub. Two other pairs of open stubs are mainly applied to suppress the high harmonic resonant modes and obtain good match, respectively. The simulated results are finally verified by our experiment of the fabricated filter. ACKNOWLEDGMENTThis work was supported in part by the China South-East University State Key Laboratory of Millimeter Waves. ABSTRACT: In this article, we have proposed a dual-band (WLAN/ UWB) antenna with open stub for WLAN/UWB applications. The designed dual-band antenna consists of a rectangular radiating patch, open stub, three steps for impedance matching, and coplanar waveguide feeding. The proposed antenna is fabricated and measured. Parametric studies and radiation characteristics for the designed antenna were presented. The designed antenna has the characteristics of wide bandwidth and negligible dispersion over the UWB frequency band and omnidirectional characteristics in the WLAN band.

New method for design and realizing multiband metamaterial is presented. For this purpose, resonator-based metamaterial is designed and investigated by both simulation and experiment with well agreement. By serially arranging the nonconcentric open loop metallic elements with different dimensions, the structure exhibits multipassbands related to the metamaterials' unique features.