Experimental characterization of FSS for WLAN applications with low-cost UWB elliptical microstrip monopole antennas

2014 ◽  
Vol 56 (6) ◽  
pp. 1331-1333 ◽  
Author(s):  
Clarissa de L. Nóbrega ◽  
Marcelo R. da Silva ◽  
Paulo H. da F. Silva ◽  
Adaildo. G. D'Assunção
Frequenz ◽  
2019 ◽  
Vol 73 (11-12) ◽  
pp. 355-366
Author(s):  
Martin Frank ◽  
Benedict Scheiner ◽  
Fabian Lurz ◽  
Robert Weigel ◽  
Alexander Koelpin

Abstract This paper presents the design and characterization of linearly polarized low-cost transmitarray antennas with ± 70° azimuth beamforming range in V-band in order to add beam steering functionality to existing radar front ends. The transmitarray antennas are composed of 13 × 13 planar unit-cells. The unit-cells consist of two layers of RO4350B laminate and provide a one bit phase resolution. The desired unit-cell behavior has been validated by simulations and measurements. Eight transmitarrays with different phase distributions have been designed and fabricated to realize different beam steering angles in azimuth. The experimental characterization of the radiation patterns shows the desired performance in the frequency range from 59 GHz to 63 GHz. Additionally, steering angle combinations in azimuth and elevation up to 40° have been realized and successfully demonstrate by measuring the 2D radiation pattern.


2020 ◽  
Vol 6 (47) ◽  
pp. eabc9943
Author(s):  
Benjamin Jenett ◽  
Christopher Cameron ◽  
Filippos Tourlomousis ◽  
Alfonso Parra Rubio ◽  
Megan Ochalek ◽  
...  

Mechanical metamaterials offer exotic properties based on local control of cell geometry and their global configuration into structures and mechanisms. Historically, these have been made as continuous, monolithic structures with additive manufacturing, which affords high resolution and throughput, but is inherently limited by process and machine constraints. To address this issue, we present a construction system for mechanical metamaterials based on discrete assembly of a finite set of parts, which can be spatially composed for a range of properties such as rigidity, compliance, chirality, and auxetic behavior. This system achieves desired continuum properties through design of the parts such that global behavior is governed by local mechanisms. We describe the design methodology, production process, numerical modeling, and experimental characterization of metamaterial behaviors. This approach benefits from incremental assembly, which eliminates scale limitations, best-practice manufacturing for reliable, low-cost part production, and interchangeability through a consistent assembly process across part types.


2011 ◽  
Vol 23 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Andres Choi ◽  
Sandro L. Vatanabe ◽  
Cícero R. de Lima ◽  
Emílio C. N. Silva

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