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This paper presents a compact asymmetric CPW fed monopole antenna using Denim fabric as substrate applicable for UWB communication and various wireless body area networks (WBANs). The geometry of the antenna consists of a circular monopole antenna with a modified ground plane and introduction of defected ground structures (DGS) to achieve ultra-wide band (3.10-10.6 GHz) characteristics. The proposed wearable antenna operates from 2.40 to 14.88 GHz providing a fractional bandwidth (FBW) of about 144.44%. Enhancement of the bandwidth is obtained by the insertion of open ended rectangular slit in the ground plane. The final antenna produces a peak gain of about 6.57 dBi at 13.05 GHz and achieved omnidirectional radiation patterns. In terms of return loss, gain, and radiation characteristics, the lightweight flexible wearable antenna is fabricated, and the tested effects are found to be in fair accordance with the simulated ones. [ABSTRACT FROM AUTHOR]

This article presents a compact circular-sectored microstrip antenna embedded with circular slots and a sectoral ground plane for enhanced bandwidth and applicable for UWB communications exhibiting an equivalent Fractional Bandwidth of 156.04% (2.5–20.25 GHz) and allows a compactness of about 79.15% using Rogers RT-Duroid 5880 as a substrate for lesser surface wave loss and attaining broader bandwidth. The gain of the antenna ranges from 1.85 to 6.10 dBi throughout the resonant frequency band and the results obtained from measurement are validated to justify the applicability of this antenna for various WLAN and Wi-MAX frequency bands. [ABSTRACT FROM AUTHOR]

In certain a UWB applications, a hexagonal monopole antenna are desired but existing solutions have CPW fed structures. In this structure a compact simple symmetrical hexagonal shaped monopole antenna with defected ground plane is presented. Impedance, radiation and gain characteristics of the proposed structure are presented and discussed. The proposed antenna make use of a novel small microstrip antenna topology which consists of a symmetrical hexagonal shaped radiating patch using FR4 substrate for cost effectiveness and in case of fabrication whereas three rectangular slots are embedded in a ground plane. In addition, impedance bandwidth (S11 < − 10 dB) of 9.03 GHz operates over a band of 3.1–12.18 GHz with a return loss of − 10 dB or more and a maximum gain of 5.1 dBi is obtained and a good agreement is achieved in simulation and measured results. The proposed one is suitable for short band radio wave communications, land-mobile or other wireless applications. [ABSTRACT FROM AUTHOR]

This paper presents a single-layer co-axial fed compact rectangular microstrip antenna for 2.4/5.2/5.8 GHz WLAN applications. The antenna consists of four rectangular and one triangular slot inside the patch and one rectangular open-ended slot inside the ground plane. Measured impedance bandwidths (2.36–2.485 and 5.14–6.43 GHz) show that the antenna is suitable for the applications in WLAN IEEE 802.11b/g and IEEE 802.11a bands. [ABSTRACT FROM AUTHOR]