This paper presents the design of a dual-band wearable planar slotted dipole integrated with a metasurface. It operates in the 2.45 GHz (lower) and 5.8 GHz (upper) bands and made fully using textiles to suit wireless body area network... more
This paper presents the design of a dual-band wearable planar slotted dipole integrated with a metasurface. It operates in the 2.45 GHz (lower) and 5.8 GHz (upper) bands and made fully using textiles to suit wireless body area network applications. The metasurface in the form of an artificial magnetic conductor (AMC) plane is formed using a rectangular patch incorporated with a diamond-shaped slot to generate dual-phase response. This plane is then integrated with the planar slotted dipole antenna prior to its assessment in free space and bent configurations. Simulations and measurements indicated a good agreement, and the antenna featured an impedance bandwidth of 164 and 592 MHz in the lower and upper band, respectively. The presence of the AMC plane also minimized the backward radiation toward the human body and enhanced realized gains by up to 3.01 and 7.04 dB in the lower and upper band.
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A flexible monopole antenna fabricated fully using textile is presented in this work. It operates in the 5 GHz Wireless Local Area Network (WLAN) and Wireless Body Area Network (WBAN)–Ultra Wideband (UWB) mandatory channel 6 centered at 8... more
A flexible monopole antenna fabricated fully using textile is presented in this work. It operates in the 5 GHz Wireless Local Area Network (WLAN) and Wireless Body Area Network (WBAN)–Ultra Wideband (UWB) mandatory channel 6 centered at 8 GHz based on the IEEE 802.15.4 standard. To alleviate backward radiation that exists in monopole antennas, it is integrated with an artificial magnetic conductor (AMC) plane. The unit cell of this AMC is designed based on a rectangular patch inserted with incisions. The unit cell operated from 6.78 GHz to 8.77 GHz. Upon forming the AMC plane with a 3 x 3 array, its integration with the ring-slotted monopole antenna resulted in its improvement of the in terms of impedance matching and gain at 5.5 GHz WLAN (lower) band and at 8 GHz WBAN-UWB (upper) band. Measurements corresponded well with simulations, producing 490 MHz and 1710 MHz of bandwidth in the lower and upper band, respectively.
This paper presents a dual-band aperture coupled antenna operating at the frequency of 2.45GHz and 5.00 GHz. The antenna has a modified inverted π-shaped slot-etched patch for the purpose of improving the directivity of antenna. Based on... more
This paper presents a dual-band aperture coupled antenna operating at the frequency of 2.45GHz and 5.00 GHz. The antenna has a modified inverted π-shaped slot-etched patch for the purpose of improving the directivity of antenna. Based on the proposed design, the measurements confirm the characteristics of the desired resonant frequencies at which are applicable for WLAN application; 2.45 GHz and 5.00 GHz with bandwidth of 161.9 MHz (6.6%) band 928.6 MHz (18.60%) respectively. As for the directivity, 8.47 dBi is achieved at 2.45 GHz and 7.80 dBi at 5.00 GHz. The antenna can be implemented for the application of energy harvesting as it possesses the desired performance needed.
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A dynamic temporary network is created through wireless mobile nodes without the need for considerable infrastructure as well as a central manager. In a mobile ad hoc network, routing protocols allow a mobile for transmission and... more
A dynamic temporary network is created through wireless mobile nodes without the need for considerable infrastructure as well as a central manager. In a mobile ad hoc network, routing protocols allow a mobile for transmission and receiving packets. In the last decade, many variants have come up for the AODV. A minimum number of hop counts are chosen for enhancing routing protocols to include additional factors that can have an impact on path selections. As the distance between each node grows, the transmission power also rises accordingly. Hence, this impacts the network’s entire performance and the most important feature is the quality of service. Most of the traditional routing protocols include energy consumption levels of the nodes and various parameters, like residual battery power, consumption of energy per packet and energy needed per transmission. A new technique is proposed in this paper to enhance the routing efficiency by making use of lion optimization algorithm after id...
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Cube Satellite (CubeSat) technology is an attractive emerging alternative to conventional satellites in radio astronomy, earth observation, weather forecasting, space research, and communications. Its size, however, poses a more... more
Cube Satellite (CubeSat) technology is an attractive emerging alternative to conventional satellites in radio astronomy, earth observation, weather forecasting, space research, and communications. Its size, however, poses a more challenging restriction on the circuitry and components as they are expected to be closely spaced and very power efficient. One of the main components that will require careful design for CubeSats is their antennas, as they are needed to be lightweight, small in size, and compact or deployable for larger antennas. This paper presents a review of antennas suitable for picosatellite applications. An overview of the applications of picosatellites will first be explained, prior to a discussion on their antenna requirements. Material and antenna topologies which have been used will be subsequently discussed prior to the presentation of several deployable configurations. Finally, a perspective and future research work on CubeSat antennas will be discussed in the c...
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A two-port circular polarization (CP) array antenna is presented in this article. The proposed antenna used two-port which each port is designed with 2 × 2 array structure and both array consist of four circular radiating elements. The... more
A two-port circular polarization (CP) array antenna is presented in this article. The proposed antenna used two-port which each port is designed with 2 × 2 array structure and both array consist of four circular radiating elements. The used of 90° triple-coupled phased shift polarizer at both left and right side of circular-slotted patches with two-port generate CP aptitude with high gain performance. Moreover, the presence of slots at center of circular elements produce discontinuity effect to assist change in the E-field and H-Field rotation of RF current and force the current to flow in CP. Axial ratio of 1.95 dB confirms the CP capability. Nonetheless, the proposed antenna demonstrates a good characteristic for MIMO's isolation with mutual coupling of −55.0 dB (S12) and −45.1 dB (S21), correlation coefficient of 1.2015e-4 and diversity gain (Gapp) of 9.9999. The proposed antenna also produced gain as high as 13.23 dB for both port. With those capabilities, the antenna designed is suitable for 5.8 GHz point-to-point communication. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2328–2332, 2015