This article focuses on the design of a CPW‐fed slot multiband antenna at frequency bands of 2.4, 3.5, 5.2, and 5.8 GHz, compliant the bandwidth requirements of the services that operate in these bands. The antenna is printed on a 30 × 32 mm2 FR‐4 substrate with thickness of 1.5 mm. Resonances are achieved by the use of a combination of slots of different geometries. The measured and simulated results prove that the proposed antenna is suitable for LTE, M‐WiMAX, Bluetooth, and WLAN applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:145–151, 2016
This paper focuses on the design of two CPW-fed slot multiband antennas. The first prototype works on four bands (2.4, 3.5, 5.2 and 5.8 GHz), and is printed on a 30x32mm2 FR-4 substrate with thickness of 1.5mm. The surface current distribution for each frequency is analyzed to introduce the different slots in the antenna. Following the same design procedure, the second antenna was obtained, this time for five bands (the four bands mentioned above and 1.7 GHz) and it was printed on 30x30mm2 of the same substrate. The measured and simulated results prove that the proposed antennas are suitable for LTE, M-WiMAX, Bluetooth, GSM and WLAN applications. Index Terms-Multiband antenna, coplanar waveguide, (CPW)-fed slot antenna.I.
El diseño e implementación de una antena de microcinta con inserción en la línea de alimentación de una estructura metamaterial, la cual vista desde una perspectiva híbrida combina resonadores de anillos divididos (SRR) y resonadores de anillos divididos complementarios (CSRR), para la banda de 2.4 GHz es presentado en este trabajo. Los parámetros geométricos de la estructura son variados con el fin de evaluar la respuesta de frecuencia de resonancia y el patrón de radiación de la antena propuesta. La estructura metamaterial adyacente a la línea de alimentación produce un aumento considerable del ancho de banda con respecto al de la antena convencional, causado por el solapamiento de las bandas de frecuencias producidas por el parche radiante y la estructura zurda. El ancho de banda de la antena con inclusión metamaterial se incrementa al doble del esperado en la antena de parche original, de 2.74% hasta valores que oscilan entre 4.55% y 6%, al precio de la degradación de la ganancia, pero sin afectar considerablemente el acoplamiento y manteniendo una adecuada directividad. Simulación y resultados medidos son presentados y muestran que la estructura metamaterial propuesta, asociada a la línea de transmisión de las antenas de microcinta, es una manera novedosa de utilizar SRR y CSRR que permite suprimir la limitante de estrecho ancho de banda. Palabras clave: Antenas de microcinta, metamaterial, resonador de anillos divididos, resonador de anillos divididos complementarios, ancho de banda.
No abstract
In this paper, we design full-duplex (FD) medium access control (MAC) protocol for co-existing wireless local area networks (WLANs) in 5G cellular networks (WCFD-MAC). Our design considers some significant features of 5G networks, exceptionally, beamforming and FD capabilities at both, the base station and user equipment. FD communications may generate interferences, namely self-interference (SI) in bidirectional FD (BFD) and interuser interferences in three-node FD (TNFD). Several efforts have been performed to mitigate the SI in BFD communications. However, the inter-user interferences in TNFD are still considered as a major drawback in FD networks. These interferences must be mitigated by an efficient MAC protocol design. WCFD-MAC protocol allows two neighboring users to simultaneously participate in TNFD communication without interfering with each other by using directional transmission and a three-node angle condition (TAC). Directional transmission combined with TAC increases system throughput. WCFD-MAC protocol allows a new half-duplex (HD) communication scheme referred to as three-node HD (TNHD). This scheme may occur when bidirectional FD (BFD) and TNFD communications cannot occur. TNHD scheme includes device-todevice (D2D) communication and allows energy efficiency, which is one of the keys requirements of 5G wireless networks. Simulations results show that WCFD-MAC protocol achieves higher throughput than existing works in the literature.
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