Switchable Split-Ring Frequency Selective Surfaces

Uçar, Mehmet; Sondaş, Adnan; Erdemli, Y.E.

doi:10.2528/pierb08031214

Cited by 32 publications

(14 citation statements)

References 12 publications

(17 reference statements)

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“…These form the general design rules for frequency selective ring resonators. 5,9 However, unlike coplanar concentric rings or square loops where the element to element spacing is uniform, the gap width s associated with the proposed coplanar rings changes constantly with the changing ring curvature. Furthermore, in order to avoid the scattering of energy in undesirable directions the spacing of the repeating element has to be less than the shortest wavelength for the broadside incident angle (0 o incident angle) in the considered operating band.…”

Section: A Fss Physical Specificationsmentioning

confidence: 99%

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Optically transparent frequency selective surfaces on flexible thin plastic substrates

et al. 2015

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A novel 2D simple low cost frequency selective surface was screen printed on thin (0.21 mm), flexible transparent plastic substrate (relative permittivity 3.2). It was designed, fabricated and tested in the frequency range 10-20 GHz. The plane wave transmission and reflection coefficients agreed with numerical modelling. The effective permittivity and thickness of the backing sheet has a significant effect on the frequency characteristics. The stop band frequency reduced from 15GHz (no backing) to 12.5GHz with polycarbonate. The plastic substrate thickness beyond 1.8mm has minimal effect on the resonant frequency. While the inner element spacing controls the stop-band frequency, the substrate thickness controls the bandwidth. The screen printing technique provided a simple, low cost FSS fabrication method to produce flexible, conformal, optically transparent and bio-degradable FSS structures which can find their use in electromagnetic shielding and filtering applications in radomes, reflector antennas, beam splitters and polarizers.

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Section: A Fss Physical Specificationsmentioning

confidence: 99%

“…The transmission and reflection characteristics of FSS can be dynamically tuned using a tuning circuit. 5 applied to a varactor diode. 4 These methods increase the size, cost and complexity of the design and require a large number of active elements.…”

Section: Introductionmentioning

confidence: 99%

Optically transparent frequency selective surfaces on flexible thin plastic substrates

et al. 2015

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“…Of these geometries, ring based designs have shown excellent performance in supporting various types of polarizations and have demonstrated a good insensibility with respect to the angle of incidence [35]. Various FSS and RFSS based on rings have been proposed, including shorted ring slots, loaded ring slots, active rings, split rings, and trapped rings [36][37][38][39]. Furthermore, ring slot FSSs have demonstrated low insertion loss and low cross-polarization levels [40].…”

Section: Introductionmentioning

confidence: 99%

An Active Ring Slot With Rf Mems Switchable Radial Stubs for Reconfigurable Frequency Selective Surface Applications

Martinez-Lopez¹,

Rodriguez-Cuevas²,

Martynyuk³

et al. 2012

PIER

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Abstract-An active ring slot resonator loaded by switchable radial stubs is investigated. It is shown that this element can be used as the unit cell of a switchable reconfigurable frequency selective surface (RFSS). Equivalent circuit and full-wave mathematical models are obtained to evaluate the reflection characteristics of the RFSS based on this element. The possibility to obtain different resonant transmission frequencies is discussed. The mathematical model developed is used to design an X band RFSS capable of obtaining resonant frequencies at 9.65, 10.28, 10.83 and 12.05 GHz. Commercially available RF MEMS switches are used to evaluate the effect of the off-state capacitances over the response of the periodic structure. To validate the numerical simulation results, different active and passive diaphragms were designed, fabricated, and tested using the waveguide simulator. A good agreement between numerical and measured results was found.

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“…One trend is to implement a tuning circuit as part of the FSS pattern so that the frequency properties can be varied [6]. High frequency PIN diodes are commonly used to switch on or off sections of the pattern, thus making the surface inductive or capacitive.…”

Section: Introductionmentioning

confidence: 99%

3d Frequency Selective Surfaces

Azemi¹,

Ghorbani²,

Rowe³

2012

PIER C

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Abstract-A novel 3D Frequency Selective Surface (FSS) architecture based on a circular ring unit element is presented. The circular ring was made 3D by creating a cylindrical element of a certain length, adding an extra degree of freedom into the structure. The length of the cylinder is shown through electromagnetic simulation to have a significant effect on the frequency characteristics of the FSS. Increasing the length of the cylinder can change the FSS from a band-stop to a band-pass filter response. The center frequency of both band pass and band stop responses can also be tuned with adjustment to the length. Dielectric materials are introduced in the center of the cylindrical unit cell elements to simultaneously obtain a stop and pass band with a sharp transition. For high dielectric filling materials, the 3D periodic structure exhibits negative refractive index metamaterial properties. A parametric analysis was conducted on these new cylindrical unit elements, and a prototype 3D FSS structure has been constructed and experimentally validated.

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Switchable Split-Ring Frequency Selective Surfaces

Cited by 32 publications

References 12 publications

Optically transparent frequency selective surfaces on flexible thin plastic substrates

Optically transparent frequency selective surfaces on flexible thin plastic substrates

An Active Ring Slot With Rf Mems Switchable Radial Stubs for Reconfigurable Frequency Selective Surface Applications

3d Frequency Selective Surfaces

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