Journal ArticleDOI
An Azimuth-Pattern-Reconfigurable Antenna With Enhanced Gain and Front-to-Back Ratio
TLDR
In this paper, a gain-enhanced pattern reconfigurable antenna is proposed, which consists of a windmill-shaped reconfigurative feeding network, four Vivaldi-shaped slots, and four groups of reconfigured artificial structures, with a gain enhancement of 1.0-3.5 dB and an FBR improvement of 4.5-8.2 dB over a wide band of 5.35-6.45 GHz.Abstract:
This letter presents a novel gain-enhanced pattern reconfigurable antenna. The proposed antenna consists of a windmill-shaped reconfigurable feeding network, four Vivaldi-shaped slots, and four groups of reconfigurable artificial structures. By electrically controlling the p-i-n diodes integrated in the feeding network and in the artificial surface, four endfire radiation patterns with enhanced gain and front-to-back ratio (FBR) are realized. The antenna is simulated and measured. Measured results show that, with the loaded reconfigurable artificial surface, a gain enhancement of 1.0-3.5 dB and an FBR improvement of 4.5-8.2 dB over a wide band of 5.35-6.45 GHz are obtained.read more
Citations
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Journal ArticleDOI
Frequency-Adjustable Planar Folded Slot Antenna Using Fully Integrated Multithrow Function for 5G Mobile Devices at Millimeter-Wave Spectrum
Jaehyun Choi,Junho Park,Youngno Youn,Woonbong Hwang,Heechang Seong,Yong Nam Whang,Wonbin Hong +6 more
TL;DR: In this paper, a low-profile frequency-adjustable planar folded slot antenna (PFSA) system was proposed for real-life smartphone platforms at the millimeter-wave (mmWave) 5G spectrum.
Journal ArticleDOI
A Frequency Diversity Printed-Yagi Antenna Element for Apertures Selectivity Wideband Array Application
TL;DR: A rudiment of wider tuning ratio array is designed for wideband reconnaissance applications and achieves no grating lobes in the radiation field.
Journal ArticleDOI
Horizontally Polarized 360° Beam-Steerable Frequency-Reconfigurable Antenna
TL;DR: In this article, a 360° beam-steerable frequency-reconfigurable antenna with horizontal polarization is proposed, which is based on an Alford loop and a parasitic circular array of tunable electric-LC$ resonators.
Journal ArticleDOI
Pattern-Reconfigurable Array Based on a Circularly Polarized Antenna With Broadband Operation and High Front-to-Back Ratio
Jeen-Sheen Row,Li-Kai Kuo +1 more
TL;DR: In this article, a single-fed circularly polarized (CP) antenna with broadband operation and high front-to-back ratio was proposed, which is mainly composed of a monopole slot, a dipole, and a metallic box.
References
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Journal ArticleDOI
Electromagnetic parameter retrieval from inhomogeneous metamaterials
David R. Smith,David R. Smith,D. C. Vier,Th. Koschny,Th. Koschny,Costas M. Soukoulis,Costas M. Soukoulis +6 more
TL;DR: It is shown here that a modification of the standard S-parameter retrieval procedure yields physically reasonable values for the retrieved electromagnetic parameters, even when there is significant inhomogeneity within the unit cell of the structure.
Journal ArticleDOI
Robust method to retrieve the constitutive effective parameters of metamaterials.
TL;DR: In this article, an improved method to retrieve the effective constitutive parameters (permittivity and permeability) of a slab of metamaterial from the measurement of S parameters is proposed.
Journal ArticleDOI
Directivity Enhancement to Vivaldi Antennas Using Compactly Anisotropic Zero-Index Metamaterials
Bin Zhou,Tie Jun Cui +1 more
TL;DR: In this article, a high-gain Vivaldi antenna based on compactly anisotropic zero-index metamaterials (ZIM) was proposed to enhance the directivity.
Book ChapterDOI
Electromagnetic Band Gap Structures in Antenna Engineering: Surface wave antennas
Fan Yang,Yahya Rahmat-Samii +1 more
TL;DR: In this article, a low profile surface wave antenna (SWA) is proposed to achieve a monopole-like radiation pattern with a null in the broadside direction, which is more attractive than a traditional monopole antenna that is a quarterwavelength high.
Journal ArticleDOI
A Novel Wideband Antenna With Reconfigurable Broadside and Endfire Patterns
Xiao Ding,Bing-Zhong Wang +1 more
TL;DR: In this paper, a wideband antenna with reconfigurable broadside and endfire radiating patterns is presented. But the proposed antenna adopts a variation of strip quasi-Yagi structure, where six parasitic strip directors are divided into two groups and located on two opposite sides of the driver.