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

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

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Gain enhancement of a wide slot antenna over a wide frequency band read more using a low profile, second order bandpass frequency selective surface (FSS) as a superstrate is presented in this paper.The proposed multilayered FSS with non-resonant unit cells in each layer allows in-phase transmission of waves radiated from the antenna over a 3dB bandwidth of about 50%.The design allows an enhancement of upto 4dBi in the antenna gain over the Pre-Rolled entire frequency band (5-8GHz) of operation.The FSS provides a very low insertion loss between the two transmission poles along with a linearly decreasing transmission phase over the band.The composite structure shows an impedance bandwidth (-10dB) of 65% with an average gain between 6-8dBi over the frequency band with a peak gain of 9dBi.

Measurement results of the fabricated prototype matches well with the predicted values.