Design of reconfigurable frequency-selective surfaces including the PIN diode threshold region

Reconfigurable frequency-selective surfaces (RFSSs) are of significant interest in applications, such as secure communication systems or tunable radomes, to improve indoor communication and smart antennas. In order to change the frequency-selective surface (FSS) characteristics, and therefore its fr...

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Bibliographic Details
Published in:IET microwaves, antennas & propagation antennas & propagation, 2018-07, Vol.12 (9), p.1483-1486
Main Authors: Mamedes, Deisy Formiga, Gomes Neto, Alfrêdo, e Silva, Jefferson Costa, Bornemann, Jens
Format: Article
Language:English
Subjects:
four‐arm star geometry
frequency response
frequency selective surfaces
geometry
indoor communication
mechanical rotation
PIN diode threshold region
p‐i‐n diodes
radiofrequency microelectromechanical system
radome
reconfigurable frequency‐selective surface
Research Article
RFSS
Schottky diode
secure communication system
semiconductor device
smart antenna
spring resonator
varactor
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Summary:Reconfigurable frequency-selective surfaces (RFSSs) are of significant interest in applications, such as secure communication systems or tunable radomes, to improve indoor communication and smart antennas. In order to change the frequency-selective surface (FSS) characteristics, and therefore its frequency response, conventional methods include loading with active semiconductor devices such as varactors, PIN diodes, Schottky diodes and radio-frequency microelectromechanical system. Another possibility is the use of mechanical adjusts, such as spring resonators or mechanical rotation. When PIN diodes are used, commonly only the reverse and forward regions, OFF and ON states, respectively, are considered. In this study, the implementation of an RFSS is described, using PIN diodes as active components. The RFSS is based on the four-arms star geometry, and initial design equations and procedures are presented. Numerical and measured results are shown for different project stages, with a very good agreement. In addition to obtaining two distinct resonant frequencies, due to the OFF and ON states, a third situation is included, considering the PIN diode threshold region when the FSS becomes practically transparent, which is an interesting feature with potential applications.
ISSN:1751-8725
1751-8733
1751-8733
DOI:10.1049/iet-map.2017.0761