This paper presents the recent advance of our activity in the field of frequency selective surfaces (FSSs) for microwave and millimeter-wave applications. Both metal plates perforated periodically with holes (inductive FSSs) and periodic arrays of metal patches patterned on a dielectric substrate (capacitive FSSs) are presented. The analysis approach based on the MoM/BI-RME method is outlined, and some relevant structures are reported, for applications which span from large antennas for radio-astronomy to sub-millimeter wave scientific purposes.
This paper presents a review of our activity in the field of frequency selective surfaces operating both in the GHz and in the THz region, and gives an overview of the state-of- the-art in this research field. A brief description is given of the applications of the frequency selective surface in different frequency bands and of the most used configurations. The possible fabrication technologies and the measurement techniques are discussed, along with the numerical methods for the analysis of frequency selective surfaces: a particular emphasis is given to the hybrid Method of the Moment/Boundary Integral-Resonant Mode Expansion method, recently developed at the University of Pavia. Some experimental results are also reported.
In this paper we present the theoretical analysis and the measurements of a quasi-optical band-pass filter, operating at 280 GHz. The filter consists of a metal screen, perforated periodically with cross-shaped apertures. The analysis is performed by the Method of the Moments (MoM), using entire domain basis functions. The Boundary Integral- Resonant Mode Expansion method is used in the calculation of the MoM matrices. The transmission and phase shifting characteristics of the band-pass filter were measured with a Terahertz Time-Domain Spectrometer and are compared with the theoretical results. The effects of the smoothness in the cross boundary, due to the fabrication process, are also discussed.
In this paper we present a full-wave algorithm for the design and the optimization of quasi-optical frequency multipliers and discuss its implementation in a specialized computer code, able to simulate the non-linear device, the planar antenna and the embedding layered structure as a whole. The analysis of the multiplier is performed under the simplifying approximation of an infinite array excited by an uniform plane wave incident from the broadside direction. The array parameters are deduced from a full-wave analysis, based on the Method of Moments, while the solution of the non-linear circuit is found by the Harmonic Balance method. This analysis algorithm is integrated into an optimization routine, which adjusts the antenna geometry and the layered structure, in order to maximize the overall conversion efficiency of the multiplier. As an example, we discuss the design of quasi- optical frequency tripler, operating at 430.5 GHz, based on Hetero-structure Barrier Varactors (HBVs). We present the characterization of the non-linear devices, the design and the fabrication of the antenna array and the optimization of the measurement setup, using the external filters and dielectric slabs.
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