Effect of inter-element spacings variation on the performance of linear grounded frequency selective surface arrays in W-band

Effect of inter-element spacings variation on the performance of linear grounded frequency selective surface arrays in W-band ■

Syed Faiz-Ul Islam, Johan Stiens, Gert Poesen, Dieter Jaeger, Cathleen De Tandt, Willy Ranson, Walter De Raedt, Roger Vounckx

Abstract ■

This article examines the issue of extending the inter-element spacing between slots of equally-spaced linear grounded frequency selective surface (FSS) arrays with spacing beyond half a wavelength in W-band (75-110 GHz). We present the design, processing, and testing of W-band grounded FSS arrays with different inter-element spacings along transverse electric (TE) and transverse magnetic (TM) field directions separately. The comparison of periodicity changing effects along TE and TM field directions has been reported. The inter-element spacing versus phase curves demonstrate that in some extent the inter-element spacing can be a phase optimization parameter for complex array design. We fabricated the corresponding FSS arrays on quartz substrate with photolithographic etching technique, and characterized the vector S-parameters with a free space MYNA.