Journal ArticleDOI
Active frequency-selective surfaces
T.K. Chang,Richard J. Langley,Edward A. Parker +2 more
- Vol. 143, Iss: 1, pp 62-66
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TLDR
In this article, two different varieties of active frequency-selective surfaces (FSS) are described and the frequency response of the surface can be electronically switched from that of a reflecting structure to a transmitting structure.Abstract:
Two different varieties of active frequency-selective surfaces (FSS) are described. In one type, active FSS elements incorporating switched PIN diodes are discussed. Waveguide simulation studies show that the frequency response of the surface can be electronically switched from that of a reflecting structure to a transmitting structure. In the other type, FSS are printed on ferrite substrates which are biased with a DC magnetic field. The application of this bias field to the ferrite allows tuning of the resonant frequency by several gigahertz. In addition, the frequency characteristics can be switched from transmitting to reflecting, as for the active element FSS.read more
Citations
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Journal ArticleDOI
A Varactor-Tunable High Impedance Surface With a Resistive-Lumped-Element Biasing Grid
Christos Mias,Jyh Haur Yap +1 more
TL;DR: In this paper, a high impedance surface consisting of metallic square patches electrically connected through vias to the ground plane beneath them is made tunable by connecting adjacent patches with varactor diodes thus altering the capacitance between the patches and hence the surface's resonance frequency.
Journal ArticleDOI
Single-Layer High-Order Miniaturized-Element Frequency-Selective Surfaces
Farhad Bayatpur,Kamal Sarabandi +1 more
TL;DR: In this article, a 2-D periodic array of metallic loops and a wire grid of the same period printed on either side of a very thin substrate is used to produce a high-Q bandpass frequency response, in addition to a transmission zero.
Journal ArticleDOI
Design Methodology for a Miniaturized Frequency Selective Surface Using Lumped Reactive Components
TL;DR: In this article, the design methodology for a miniaturized frequency selective surface (FSS) using lumped reactive components is described, where capacitive and inductive elements are utilized in metallic patches to create current loops similar to that observed in bandpass aperture type FSS.
Journal ArticleDOI
Switchable low-loss RF MEMS Ka-band frequency-selective surface
TL;DR: In this article, a switchable frequency-selective surface (FSS) was developed at 30 GHz using RF microelectromechanical systems (MEMS) switches on a 500-/spl mu/m-thick glass substrate.
Proceedings Article
Switchable low-loss RF MEMS Ka-band frequency-selective surface
TL;DR: In this paper, a switchable frequency-selective surface (FSS) was developed at 30 GHz using RF microelectromechanical systems (MEMS) switches on a 500-μm-thick glass substrate.
References
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Journal ArticleDOI
Magnetic tuning of a microstrip antenna on a ferrite substrate
David M. Pozar,V. Sanchez +1 more
TL;DR: In this article, the operating frequency of a microstrip antenna on a ferrite substrate can be tuned by varying the DC magnetic bias field applied to the ferrite, with usable patterns and return loss over this band.
Journal ArticleDOI
Frequency selective surfaces on biased ferrite substrates
TL;DR: In this paper, the frequency characteristics of frequency selective surfaces printed on ferrite substrates are discussed and the application of a DC magnetic bias field to the ferrite allows tuning of the resonance frequency by several gigahertz.
Journal ArticleDOI
An active square loop frequency selective surface
TL;DR: In this paper, an active frequency selective surface incorporating PIN diodes as switches is discussed, and it is shown that the frequency response of the surface can be electronically switched from that of a reflecting structure to a transmitting structure.
Journal ArticleDOI
Tunable frequency selective surface using liquid substrates
TL;DR: In this paper, the passband of a convoluted slot array is switched in frequency by exchanging liquid substrates, and liquid with epsilon /sub r/ approximately 2.2 gives a 3 GHz frequency shift and a 16 dB change in the transmission coefficient at 17 GHz.
Journal ArticleDOI
Active FSS in an experimental horn antenna switchable between two beamwidths
TL;DR: An experimental H-plane sectoral horn with interior active FSS wall in the E-plane is described in this article, which is switchable between transmitting and reflecting states, which enables the horn beamwidth to be varied.