Sub-Wavelength Frequency Selective Surface Design for Improved Antenna Array Out-of-Band Rejection

Conference paper (2016)

Authors

C. Yepes Julia Tera-Hertz Sensing -

D. Cavallo Tera-Hertz Sensing -

A. Neto Tera-Hertz Sensing -

E. Gandini TNO

S. Monni TNO

F.E. van Vliet TNO

Research Group

Tera-Hertz Sensing () (TU Delft)

Phased array antenna Bandpass filters Frequency selective surfaces (FSSs)

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http://resolver.tudelft.nl/uuid:683a9b51-646e-483f-b577-508613412736

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Published Date

2016-10

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Tera-Hertz Sensing

Abstract

In this work, the problem of enhancing the frequency selectivity property of an antenna array has been studied. A solution based on a multi-layer frequency selective surface (FSS), composed of sub wavelength elements is proposed. An equivalent circuit model is used for the design, under the assumption that the inter-layer interaction is dominated by a single Floquet mode. This approximation remains valid by keeping the unit-cell size comparable to the inter-layer distance. Results for generic oblique incidence are presented. Fast roll-off is achieved by using a 3 pole Chebyshev filter design. Moreover, the FSS is used in combination with a connected slot array antenna. The resulting structure allows to scan up to 45° in both principal planes with a relative bandwidth (S11<; -10 dB) of 15% around the central frequency f0 = 4.8 GHz. Higher order harmonics are rejected up to 18 GHz.