Gain Enhancement of a Wide Slot Antenna Using a Second-Order Bandpass Frequency Selective Surface

A Dual Layer Frequency Selective Surface Reflector for Wideband Applications

“…6(b) for different values of air gap H and it can be observed that increasing air gap increases this bandwidth. Such variation of phase makes the FSS useful for gain and directivity enhancement of antennas with bidirectional or omni-directional radiation over a wide frequency band [6].…”

“…[1][2][3]. In recent years, researchers have become interested in designing wideband FSS structures of both bandpass and bandstop response for their applications in gain or directivity enhancement of broadband, omni-directional antennas such as slot antennas when used as their substrates (bandstop) or superstrates (bandpass) [4][5][6][7][8][9]. Such enhancements are also possible with simple metallic reflectors placed at quarter wavelength spacing from the antenna, but their functioning is optimal over a smaller bandwidth.…”

“…Such enhancements are also possible with simple metallic reflectors placed at quarter wavelength spacing from the antenna, but their functioning is optimal over a smaller bandwidth. Moreover FSS also provides shielding to the antenna against nearby conductive elements [6]. Gain and bandwidth enhancement of a dual band U slot patch antenna using loop shaped FSS as substrate was proposed by Hsing-Yi Chen and Yu Tao [5].…”

“…In case of wideband FSS, introduction of air gap between the layers reduce their mutual coupling leading to a significant reflection over the bandwidth. Cascaded FSS screen with a nearly linear variation of transmission or reflection phase over a wide bandwidth is very useful in enhancing radiation properties of antennas with bidirectional radiation such as wide slot antennas as was discussed in [6].…”

Gain Augmentation of a HMSIW based Equilateral Triangular Antenna using CRSF FSS Superstrate

“…FSS exhibits band-pass or band-stop spectral behavior depending upon the type of array elements used. Nowadays, in order to enhance the antenna performance, they are being used as superstrates or substrates [19][20][21][22][23][24][25][26][27][28][29]. Chen and Tao [19] for the first time proposed a dual-band FSS consisting of regular Jerusalem cross elements and studied its impact on the bandwidths and resonant frequencies of a U-slot patch antenna.…”