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Miniaturized-Element Frequency Selective Surfaces for Millimeter-Wave to Terahertz Applications

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2 Author(s)
Moallem, M. ; Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan at Ann Arbor, Ann Arbor, MI, USA ; Sarabandi, K.

This paper presents a single-face, membrane-supported, miniaturized-element frequency selective surface (MEFSS) for image rejection of a J-band upconvertor mixer. In this design, a new miniaturized-element patch-wire MEFSS configuration is proposed to select the upper-side band (USB) response of a wave radiated from an upconvertor. The proposed MEFSS produces a single pole and an adjacent transmission zero to suppress the lower sideband. It is shown that the frequency response of this MEFSS can be predicted by an equivalent circuit model and that the location of pole and zero can be tuned independently with physical parameters. MEFSS elements are supported and protected by a 10 μm thick low-loss polymer membrane which allows flexible handling and minimizes substrate losses. Thickness of the metallic traces is increased to reduce the conductor loss. A salient feature of this design is low sensitivity of its frequency response to the angle of incidence and the absence of a harmonic response. This feature allows placement of the spatial filter in close proximity to radiating elements with spherical wavefronts. The membrane-supported MEFSS is fabricated using a microfabrication method with tolerances that allow such filter implementations up to terahertz frequencies. Performance of the fabricated device is experimentally verified using a free-space measurement setup. Experimental results show that the transmission response has 0.6 dB insertion loss in the passband (221-223 GHz) and more than 25 dB rejection out-of-band (206-208 GHz) which is in good agreement with full-wave simulation and its circuit model prediction.

Published in:

Terahertz Science and Technology, IEEE Transactions on  (Volume:2 ,  Issue: 3 )

Date of Publication:

May 2012

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