scholarly journals Technologies for Near-Field Focused Microwave Antennas

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Paolo Nepa ◽  
Alice Buffi ◽  
Andrea Michel ◽  
Giuliano Manara
Keyword(s):  
Dielectric Resonator ◽  
Fresnel Zone ◽  
Near Field ◽  
Microwave Frequency ◽  
Fresnel Zone Plate ◽  
Leaky Wave ◽  
Microwave Antennas ◽  
Waveguide Arrays ◽  
Dielectric Resonator Antennas ◽  
Fresnel Zone Plate Lenses

This paper provides a review spanning different technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens of GHz: arrays of microstrip patches and printed dipoles, arrays of dielectric resonator antennas, reflectarrays, transmitarrays, Fresnel zone plate lenses, leaky-wave antennas, and waveguide arrays.

scholarly journals Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 705 ◽  
Author(s):  
Sergio Pérez-López ◽  
José Miguel Fuster ◽  
Pilar Candelas ◽  
Daniel Tarrazó-Serrano ◽  
Sergio Castiñeira-Ibáñez ◽  
...  
Keyword(s):  
Control Parameter ◽  
Fresnel Zone ◽  
Dynamic Control ◽  
Limited Range ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
The Finite Element Method ◽  
Fem Simulations ◽  
Fresnel Zone Plate Lenses ◽  
Good Agreement

In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental measurements and the finite element method (FEM) simulations. This lens becomes an appealing alternative to other dual-focusing lenses, in which the foci location can only be set at a limited range of positions, such as M-bonacci zone plates. Moreover, the variation of the operating frequency has also been analyzed, providing an additional dynamic control parameter in this type of lenses.

Multilevel phase Fresnel zone plate lens as a near-field optical element

2007 ◽  
Vol 269 (2) ◽  
pp. 271-273 ◽  
Author(s):  
Yaoju Zhang ◽  
Junfeng Chen ◽  
Xuehua Yea
Keyword(s):  
Fresnel Zone ◽  
Near Field ◽  
Optical Element ◽  
Zone Plate ◽  
Fresnel Zone Plate

Near Field Acoustic Pattern Of Fresnel Zone Plate Transducers

1982 ◽  
Author(s):  
M. Mortezaie ◽  
G. Wade ◽  
B. Noorbehesht
Keyword(s):  
Fresnel Zone ◽  
Near Field ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Acoustic Pattern

scholarly journals MILLIMETER-WAVE OFFSET FRESNEL ZONE PLATE LENSES CHARACTERIZATION

2014 ◽  
Vol 54 ◽  
pp. 125-131 ◽  
Author(s):  
German Leon ◽  
Luis F. Herran ◽  
Max O. Munoz ◽  
Fernando Las-Heras ◽  
Yang Hao
Keyword(s):  
Millimeter Wave ◽  
Fresnel Zone ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Fresnel Zone Plate Lenses

Improved zoning rule for designing square Fresnel zone plate lenses

2006 ◽  
Vol 49 (2) ◽  
pp. 276-278 ◽  
Author(s):  
I. V. Minin ◽  
O. V. Minin ◽  
A. Petosa ◽  
S. Thirakoune
Keyword(s):  
Fresnel Zone ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Fresnel Zone Plate Lenses

Thin Fresnel zone plate lenses for focusing underwater sound

2015 ◽  
Vol 107 (1) ◽  
pp. 014103 ◽  
Author(s):  
David C. Calvo ◽  
Abel L. Thangawng ◽  
Michael Nicholas ◽  
Christopher N. Layman
Keyword(s):  
Fresnel Zone ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Underwater Sound ◽  
Fresnel Zone Plate Lenses
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