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: In this article, an exhaustive parametric study of 3-element and 6-element Yagi-Uda antennas has been carried out using Method of Moments (MOM) for TV reception and other applications in the VHF/UHF band.
Abstract: Yagi-Uda antenna is extensively used for TV reception and other applications in the VHF/UHF band. Because of mutual interaction among the array elements, the directivity (D), front to back ratio (F/B), and Input impedance (Zin) are complicated functions of element dimensions and their relative spacings. Hence, an exhaustive parametric study of 3-element and 6-element Yagi-Uda antennas has been carried out using Method of Moments (MOM). The performance of both 3-element and the 6-element Yagi-Uda antennas has been optimized with respect to D, F/B, and VSWR.
3 citations
TL;DR: In this paper, the back radiation of the microstrip patch antenna is reduced by removing some metallic parts around the ground plane and placing a new soft-surface configuration, consisting of an array of stand-up split-ring resonators on a bare dielectric substrate near the two ground plane edges.
Abstract: This study presents a new, simple method for improving the front-to-back (F/B) ratio of a microstrip patch antenna. The back radiation of the microstrip patch antenna is reduced by removing some metallic parts around the ground plane and placing a new soft-surface configuration, consisting of an array of stand-up split-ring resonators on a bare dielectric substrate near the two ground plane edges. Compared to the F/B ratio of a conventional microstrip patch antenna with a full ground plane of the same size, our proposed microstrip patch antenna experimentally achieves an improved F/B ratio of 9.6 dB.
3 citations
3 citations
01 Aug 2017
TL;DR: In this paper, two rod shaped parasitic elements on either side of the patch antenna were introduced to improve the front-to-back ratio (FTBR) of a microstrip patch antenna.
Abstract: This study presents a novel, simple technique to improve the Front-To-Back Ratio (FTBR) of a microstrip patch antenna. The radiation in the backward direction of the microstrip patch antenna is reduced by introducing two rod shaped parasitic elements on either side of the patch antenna, designed for 1.77GHz. The simulation results obtained, by using CST Microwave Studio 2016, show that the back lobe can be reduced by more than 15dB, over and above the plain microstrip antenna. The return loss also gets reduced. Half Power Beamwidth (HPBW), bandwidth and antenna efficiency are also increased.
3 citations
01 May 2017
TL;DR: Cross pie-shaped printed dipole antenna with artificial magnetic conductor (AMC) reflector is proposed and a unique feed structure that does not utilize hybrid coupler and provide wideband operation for the target frequency band is proposed.
Abstract: With the introduction of multiple GNSS service providers, antennas that cover all GNSS bands become especially important. All-band GNSS antenna must cover 1146 MHz-1610 MHz band, have high front to back ratio, and good axial ratio with large beamwidth for better satellite coverage. Although many antenna topologies exist for broadband operation, circularly polarized (CP) broadband antennas that simultaneously have impedance and axial ratio wide bandwidths are scarce. Especially for GNSS applications, antenna performance can be demanding depending on the application and limited space provided for the antenna. To overcome these shortcomings, crossed pie-shaped printed dipole antenna with artificial magnetic conductor (AMC) reflector is proposed. We also propose a unique feed structure that does not utilize hybrid coupler and provide wideband operation for the target frequency band. The proposed antenna is realized and measurement results are corroborated with simulations.
3 citations