Orthogonal Frequency Division Multiple Access (OFDMA) is a multi-user version of the Orthogonal Frequency Division Multiplexing (OFDM) transmission technique, which divides a wideband channel into a number of orthogonal narrowband subchannels, called subcarriers. An OFDMA system takes advantage of both frequency diversity (FD) gain and frequency-selective scheduling (FSS) gain. A FD gain is ach...

In this paper, a high-gain flexible cylindrical antenna with rotatable curved frequency selective surface (FSS) is presented, which designed for the 2.4 GHz industrial scientific medical (ISM) band. The array of 3 × optimized FSS unit cells (102 102 mm2) applied to improve gain (50.4 28 0.1 mm3). Through rotation FSS, omnidirectional enhancement realized. simulation and measurement results demo...

In this letter, a three-dimensional (3-D) wide passband frequency selective surface (FSS) is proposed. Compared with planar FSSs, 3-D structures usually present superior roll-off characteristics, especially under lower frequency. However, wideband FSSs typically have greater insertion loss in the passband, and transmission characteristic sensitive to angle of incident electromagnetic wave. The ...

The application of closely packed elements to obtain wideband isolation at mobile phone frequency bands while allowing transparency at the emergency TETRA and the Bluetooth bands is proposed. The intention is to modify the EM architecture of buildings over a very wide frequency range, permitting access at these two very separated bands. In particular, we have in mind buildings with restricted m...

An ultra-wideband (UWB) antenna with a novel multilayer frequency selective surface (FSS) reflector is presented. A significant enhancement in the gain has been achieved in a low profile design while maintaining the excellent impedance bandwidth of the UWB antenna. The average peak gain of the antenna has been increased from 4 dBi to 9.3 dBi as a consequence of the use of the FSS reflector. Mor...

In a simple scalable audio coding scheme, there are usually two layers – a base layer and an enhancement layer. This paper presents a novel scheme with AMR-WB as base layer and AAC as enhancement layer. To optimally code the signal in the enhancement layer a frequency selective switch (FSS) control algorithm is described. The FSS determines whether the original signal or the residual of the ori...

Microwave oven generates a harmful electromagnetic wave at 2.45GHz of 1000Watts. The generated microwave is confined within the cavity of the oven for efficient heating and secured operation. To prevent microwave leakage through the front glass door, a special construction of Faraday Cage is involved. In this paper, Faraday Cage is replaced with Transparent Frequency Selective Surface Front Doo...

Frequency Selective Surfaces (FSSs) have become increasingly popular during the last years due to their combined characteristics, which meet, in general, requirements of next-generation wireless communication networks. In this work, a cross-platform design framework for FSS structures is presented and evaluated by utilizing recently introduced evolutionary optimization algorithm, namely, Multi-...

We designed and fabricated a terahertz (THz) frequency selective surface (FSS) based on two distinct additive manufacturing technologies, namely, printable electronics (PE) three-dimensional (3D) printing. Silver nanoparticle ink was printed polyethylene terephthalate (PET) substrate utilizing large-scale roll-to-roll industrial PE technique with flexographic unit, while the 3D-printed THz FSS ...