A Dual-Band, Inductively Coupled Miniaturized-Element Frequency Selective Surface With Higher Order Bandpass Response

Abstract

We present a new approach for designing dual-band miniaturized-element frequency selective surfaces (MEFSSs) with independent control of the frequencies of operation of each band. The proposed device is composed of two-dimensional periodic arrays of sub-wavelength inductive wire grids and capacitive patches separated by dielectric substrates. The structure is built upon an inductively-coupled MEFSS that uses capacitivelyloaded dielectric spacers as its main resonators. The two operating bands of this MEFSS correspond to the first and second resonant frequencies of its constituting resonators. By judiciously choosing the locations where the resonators are loaded and the load values, the frequencies of the first and second resonances can be controlled individually. This way, a dual-band MEFSS with independent frequency bands of operation can be obtained.Using the equivalent circuit model of this MEFSS, a synthesis procedure is developed that can be used to synthesize the dualband MEFSS from its system level performance indicators. A prototype of the proposed dual-band MEFSS with second-order bandpass response at each band is designed, fabricated, and experimentally characterized. The measurement results of this device show a stable frequency response with respect to the angle of incidence up to ±45 • for both TE and TM polarizations of incidence.

A novel miniaturized-element frequency selective surface with a second-order bandpass response

“…Frequency selective surface (FSS) is a one-dimensional or two-dimensional periodic structure with bandpass or bandstop spatial filtering properties which can propagate or prevent the electromagnetic wave through space. FSSs are widely used in many fields including radar cross section (RCS) reduction of the military objects, electromagnetic compatibility, microwave absorbers and lenses, reflectarrays, RFID tag and so on [1,2,3,4,5].…”

Angularly Stable Frequency Selective Surface Combined With a Wide-Scan Phased Array

“…The thickness was electrically small, less than λ/10, rather than a multiple of λ/4, resulting in lower losses. Nevertheless, in [9] or in other more recent designs [10] the FSS was only characterized and tested under plane-wave illumination.…”

“…Another aspect to be taken into account when designing MEFSSs is the tolerance of manufacturing, which can produce significant differences between simulations and measurements [10]. A study of the effects of the fabrication inaccuracies on the performance of the FSS is also presented here.…”

A High Selectivity, Miniaturized, Low Profile Dual-Band Bandpass FSS with a Controllable Transmission Zero

“…With the rapid development of radars and wireless communicating technologies, there has been an increasing demand for a miniaturized dual-band frequency selective surface in modern communication systems [10]. The main methods used to design dual-band frequency selective surfaces are perturbation technique [11,12], fractal technology [13], combination technology [14], complementary technology [15], multilayered technology [16][17][18][19][20][21], and 3D FSS [22][23][24][25][26]. The perturbation technique is a mean of increasing the perturbation between cells or units to convert a single band frequency selective surface into a dual-band surface.…”

“…In [17], a dual-band FSS with high selectivity is presented, but a modal interaction null has occurred in the high-frequency band when the incident angle increases. A dual-band FSS based on the inductance couple proposed in [19] had a satisfactory performance of selectivity and angular stability. But its insertion loss is high due to the high dielectric constant substrate.…”