A printed microstrip-line-fed slot antenna with a pair of parasitic patches for bandwidth enhancement is proposed in this paper. By using the parasitic patches along the microstrip feed line, an additional resonance is excited and a good performance of bandwidth enhancement can be obtained. The proposed antenna is designed and manufactured successfully. The measurement shows a good agreement with the simulation. From the measured results, the enhanced impedance bandwidth, defined by voltage standing wave ratio (VSWR) less than 2, is about 136% ranging from 2.1 to 11.1 GHz. In addition, stable and nearly omnidirectional far-field radiation patterns are observed over the entire operating band.Index Terms-Bandwidth enhancement, microstrip-line-fed antenna, printed slot antenna, parasitic patch.
Abstract-A novel tri-band printed monopole antenna with an etched ∩-shaped slot and a parasitic ring resonator is proposed for satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications simultaneously. The proposed antenna comprises a rectangular radiation patch with an arcshaped edge and an embedded ∩-shaped slot on the top and a parasitic ring resonator on the opposite side. The measured results show that the impedance bandwidths of the proposed antenna, defined by voltage standing wave ratio (VSWR) ≤ 1.5, are 350 MHz (2370-2720 MHz), 680 MHz (3390-4070 MHz) and 1080 MHz (4920-6000 MHz), which cover the required bandwidths for both WLAN (2400-2480 and WiMAX (2500-2690 applications. Furthermore, good monopole-like radiation characteristics with moderate peak gains are obtained over the operating bands.
A novel coplanar waveguide (CPW)-fed printed monopole antenna with an n-shaped slot for dual-band operations is proposed. By etching an n-shaped slot on the radiating element, two tunable operating bands can be obtained. The measured results indicate that the impedance bandwidths of the proposed antenna, defined by 10-dB return loss, are 13.ABSTRACT: In this article, a low-cost, compact printed microstrip-fed circular monopole ultra-wideband antenna with dual band-notched function is proposed. By embedding a C-shaped slot on the circular radiating patch and a pair of L-shaped slots on the rectangular ground patch, dual band notched characteristics around 3.5 GHz for WiMAX and 5.5 GHz for wireless local-area network (WLAN) can be obtained. The proposed antenna is designed, fabricated, and tested. The measured results show UWB impedance bandwidth with dual notch, stable radiation patterns, and constant gain. The proposed antenna, with a compact dimension of 24 Â 36 mm 2 , operates over the frequency band from 2.5 to 10.6 GHz with S 11 À10 dB, except the over the dual notch bands of 3.3-4.2 and 5.1-5.9 GHz. Group delay and transfer function indicate that the antenna has good transient response. In addition, the radiation patterns are nearly omnidirectional in H-plane and typical monopole-like in E-plane. V C 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:242-246, 2012; View this article online at wileyonlinelibrary.com.
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