Modeling an FSS with a simple equivalent circuit has been
reported in [11]. In general, the FSS structures can be
categorized into patch-type elements and aperture-type
elements. Element shape is not just limited to square loops or
patches, the element can be circular rings, or others convoluted
shapes. Many factor that influence the FSS response such as
FSS's element geometry, the dielectric substrate which supports
the FSS, and the signal incident angles. The element geometry
is a fundamental aspect a designer should determine in FSS
design. Both the element conductivity and the dielectric
substrate's permittivity have a great influence on FSS design.
Each shape had its own unique frequency characteristics.
Different shapes have different performance such as desirable
wide operating bandwidth and sensitive to incident angle and
perform inconsistently between vertical and horizontal signal
polarizations. The shape of the conducting element which
constitutes an FSS is unrestricted. Generally, there are four
basic groups of element shapes; Centre connected, loop types,
solid interior types, combination[12]. Element square loop
shapes is the best performance among all element shapes based
on a single layer freestanding FSS[13] . The general selective
characteristic of a square loop FSS antenna is chosen to be a
band-pass for this project. Figure 1 shows the fabricated FSS
structure using TLY-5 substrate.
Modeling an FSS with a simple equivalent circuit has beenreported in [11]. In general, the FSS structures can becategorized into patch-type elements and aperture-typeelements. Element shape is not just limited to square loops orpatches, the element can be circular rings, or others convolutedshapes. Many factor that influence the FSS response such asFSS's element geometry, the dielectric substrate which supportsthe FSS, and the signal incident angles. The element geometryis a fundamental aspect a designer should determine in FSSdesign. Both the element conductivity and the dielectricsubstrate's permittivity have a great influence on FSS design.Each shape had its own unique frequency characteristics.Different shapes have different performance such as desirablewide operating bandwidth and sensitive to incident angle andperform inconsistently between vertical and horizontal signalpolarizations. The shape of the conducting element whichconstitutes an FSS is unrestricted. Generally, there are fourbasic groups of element shapes; Centre connected, loop types,solid interior types, combination[12]. Element square loopshapes is the best performance among all element shapes basedon a single layer freestanding FSS[13] . The general selectivecharacteristic of a square loop FSS antenna is chosen to be aband-pass for this project. Figure 1 shows the fabricated FSSstructure using TLY-5 substrate.
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