Topic
Front-to-back ratio
About: Front-to-back ratio is a research topic. Over the lifetime, 292 publications have been published within this topic receiving 3314 citations.
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TL;DR: A three beam-switched top-loaded monopole antenna is proposed to realize its small size and planar structure and allows for reduction in the number of elements as well as downsizing.
Abstract: The three beam-switched top-loaded antenna is suited to be applied to a wireless local area network to switch the radiation pattern by arranging several unidirectional antennas. In this paper, a three beam switched top loaded monopole antenna is proposed to realize its small size and planar structure. Three top loaded monopole antennas are arranged around a parasitic hexagonal patch at intervals of 120 degrees. The feed element is selected by the switching device to switch the radiation pattern. This antenna allows for reduction in the number of elements as well as downsizing. The front to back ratio (F/B) becomes 23 dB by selecting suitable parameters.
4 citations
01 Nov 2019
TL;DR: In this article, the authors proposed a self-diplexing antenna based on the function of operating mode and perturbation of the higher order modes methodology, which produces the unidirectional radiation pattern, high front to back ratio (>17 dB) and gain of 4.7dBi and 5.2dBi at two resonant frequencies of 8.12GHz and 10.15GHz for the X-band application as satellite and wireless communication systems.
Abstract: A design of substrate integrated waveguide (SIW) based self-diplexing dumbbell-shaped slot antenna is presented in this paper. The proposed antenna comprises of two micro-strip feed lines of impedance 50Ω and two parallel dumbbell-shaped slots. These transverse parallel slots are of different lengths, etched on the patch (top surface) of the SIW cavity; produce two resonant frequencies at 8.12GHz & 10.15GHz. The proposed self-diplexing antenna is based on the function of operating mode and perturbation of the higher order modes methodology. The better intrinsic isolation of 26.5dB is obtained between two input ports, which define the unique property of the self-diplexing antenna and reduce the space and size of overall wireless transceiver modules. The proposed antenna produces the unidirectional radiation pattern, high front to back ratio (>17 dB) and gain of 4.7dBi & 5.2dBi at two resonant frequencies of 8.12GHz & 10.15GHz for the X- Band application as satellite and wireless communication systems.
4 citations
TL;DR: In this paper, the authors proposed a miniaturized all-metal ultrawideband (UWB) magneto-electric monopole (MEM) antenna for multistandard communication.
Abstract: We propose a novel miniaturized all-metal ultrawideband (UWB) magneto-electric monopole (MEM) antenna in this communication. The proposed antenna is composed of a half-ellipse electric monopole and a quarter magnetic loop. The half-ellipse electric monopole consists of a half ellipse with a rectangular slot, a loaded patch, and an L-shape ground fed by a coaxial connector. Enhanced robustness to severe surrounding environments and lower loss can be achieved by employing an all-metal structure instead of the structure including dielectric materials. A prototype was fabricated and measured. Results show that the proposed MEM antenna can operate in the frequency band of 2.5–13 GHz even higher frequency with the miniaturized dimensions of $0.25\lambda \times 0.24\lambda \times 0.17\lambda $ that is much smaller than a magneto-electric dipole. A unidirectional wide beam radiation pattern with a 10 dB front to back ratio can be obtained. Moreover, the group delay is analyzed which reveals the antenna with good time domain characteristics. The proposed MEM antenna can be employed as a multifunctional antenna operating for multistandard communication networks in a limited space.
4 citations
03 Jul 2005
TL;DR: In this paper, a novel printed antenna composed of a series-fed dipole array and a planar-type conductor-backed coplanar waveguide-tocoplanar stripline (CBCPW-to-CPS) transition in a uniplanar configuration is presented.
Abstract: A novel printed antenna composed of a series-fed dipole array and a planar-type conductor-backed coplanar waveguide-to-coplanar stripline (CBCPW-to-CPS) transition in a uniplanar configuration is presented. According to careful design and optimization, the CBCPW-to-CPS transition possesses 120% bandwidth (for the 10 dB return loss criterion), which facilitates an antenna with a very broad bandwidth. The measured results of the antenna indicate an operating bandwidth of 100%, an end-fire radiation pattern with a front-to-back ratio greater than 15 dB, and cross-polarization radiation less than -16 dB across the frequency band of interest.
4 citations
TL;DR: An end-fire microstrip patch antenna (MPA) is proposed of 3 GHz as a center frequency, designed, simulated, and measured to work on WiMAX frequencies within standard of 802.16e (WiMAX).
Abstract: In this paper, an end-fire microstrip patch antenna (MPA) is proposed of 3 GHz as a center frequency, designed, simulated, and measured to work on WiMAX frequencies within standard of 802.16e (WiMAX). A high gain ranged between (12.117-13.324) dB, high front to back ratio (F/B) of (35.770) at the center frequency, a wide band of 1.701 GHz, low profile, and semi-ideal voltage standing wave ratio (VSWR) of 1.053 is achieved. The simulation is done using computer simulation technology (CST-MW). The proposed design is based on two Fire-retardant substrates (FR-4) of relative permittivity (e) 4.3+j0.025 and 1.53 mm thickness for each one, which is considered a high loss material. The measurement results show good agreement with the simulated results. In addition, the design can be used for harvesting power supply from mobile towers. Finally, the proposed design is compared with two other designs in terms of power conversion efficiency and overall size.
4 citations