A New Compact, Stable, and Dual-Band Active Frequency Selective Surface with Closely Spaced Resonances for Wireless Applications at 2.4 and 2.9 GHz

Abstract

This paper presents a dual-band active frequency selective surface (AFSS) with closely spaced bands and angular stability for wireless applications at 2.4 and 2.9 GHz. The proposed AFSS element geometry is composed of a slotted cross dipole combined with four ring patches, where the diameter of the ring patches at the top of the geometry is 1.618 times greater than the diameter of the ones at the bottom. The choice of this multiplying factor, used to define the geometry of the proposed patch element, is based on the Fibonacci sequence of numbers. In addition, to perform frequency reconfiguration, two p-i-n diode switches are used, which are placed at the input of the ring patches placed at the top of the AFSS element geometry. The AFSS simulation is performed using Ansoft HFSS software and using generalization of the WCIP, i.e., GWCIP, method. The simulated results are compared with the experimental ones for validation purpose. A very good agreement is observed between the simulated and measured results.

A tri‐band complementary frequency selective surface with very closely spaced resonances

“…Furthermore, solutions with passive FSS can be achieved with an identical or even superior response, being simpler to build and with lower costs than the proposals of ref. [15,16].…”

Frequency Selective Surface for Ultra-Wide Band Filtering and Shielding

“…The prototype, containing 13 × 10 unit cells and operating as a band-stop filter at 2.45 and 5.5 GHz (Wi-Fi and WLAN), has been demonstrated to be polarization insensitive and angle independent up to 45 • . The interest in stop-band filters for wireless applications is demonstrated also by the conception of an active surface containing p-i-n diodes as control elements [12], with a unit cell based on ring patches and cross-dipoles, and exhibiting closely spaced resonant frequencies of 2.36 and 2.89 GHz. The proposed structure, with dimensions of the unit cell of 21 × 18 mm 2 , has been implemented on an FR4 prototype board with dimensions of 20 × 20 cm 2 and tested in normal and oblique incidence up to an angle of 40 • .…”

Performance evaluation of compact FSS‐integrated flexible monopole antenna for body area communication applications

“…In the recent literature, many design configurations have been studied to incorporate fractal‐inspired antennas to provide compactness, dual‐band, and wide‐band for wearable applications 4–8 . Many frequency selective surface (FSS) structures have been reported 9–14 in the literature to alter the radiation characteristics of the antenna for the desired applications. A polygon‐shaped miniaturized FSS is presented as an electromagnetic shield for conformal applications 11 .…”

“…Convoluted elements and square slots FSS is introduced to obtain compactness of the FSS in previous studies 10,13 . AFSS array elements consist of a slotted cross dipole combined with four ring patches that are presented 12 to achieve dual‐band rejection. Multilayer FSS 14 is presented to reject dual‐band wi‐fi communications effectively.…”