Active Frequency Selective Surfaces Using Incorporated PIN Diodes

Kihun CHANG  Sang il KWAK  Young Joong YOON  

IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.12   pp.1917-1922
Publication Date: 2008/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.12.1917
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
frequency selective surfaces,  PIN diode,  active FSS,  equivalent circuit modeling,  surface impedance,  

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In this paper, active frequency selective surfaces (FSS) having a squared aperture with a metal plate loading are described. Active FSS elements using switched PIN diodes are discussed with an equivalent circuit model. A unit cell consists of a square aperture element with metal island loading and one PIN diode placed at the upper gap, considering the vertical polarization. The electromagnetic properties of the active FSS structure are changed by applying dc bias to the substrate, and they can be estimated by the equivalent circuit model of the FSS structure and PIN diode. This active FSS design enables transmission to be switched on or off at 2.3 GHz, providing high transmission when the diodes are in an off state and high isolation when the diodes are on. The equivalent circuit model in the structure is investigated by analyzing transmission and reflection spectra. Measurements on active FSS are compared with numerical calculations. The experimentally observed frequency responses are also scrutinized.