Periodic comb reflection frequency selective surface for interference reduction

IEEE Trans. Antennas Propagat.

Pechač

et al. 2015

Numerical techniques for calculating electromagnetic fields within three dimensional surfaces are computationally intensive. Therefore, this paper presents the application of a mode-matching technique developed for analyzing electromagnetic scattering from periodic comb surfaces illuminated by a plane wave. A set of linear equations have been developed to calculate mode coefficients of the field distribution for both E-polarized and H-polarized incident waves. Analysis is performed for two cases where the comb thickness is either infinitely thin or of a finite thickness. The technique is shown to accurately predict both field intensities within the near-field of the periodic surface and far-field scattering patterns. Results are compared to those obtained using the finite integration techniques (FIT) implemented in CST Microwave Studio. Furthermore, numerical results are compared to measurements of an aluminum prototype. Additional far-field scattering measurements using a bi-static system provide additional confidence in CST simulations and the mode-matching methods presented here.Index Terms-Mode matching, electromagnetic scattering, periodic structures, CST Microwave Studio.

Section: Generic Field Matching Solution For Fins Of Arbitrary Tmentioning

confidence: 99%

Section: A Comparison Of Analytical Simulation With Cst For Infinitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Mode-Matching Technique for Analysis of Scattering by Periodic Comb Surfaces

Valtr

IEEE Trans. Antennas Propagat.

Pechač

et al. 2015

“…Various passive surfaces used for specular reflection reduction have been previously investigated [3,4], with comb reflection frequency selective surfaces (CR-FSS) designed to work in the frequency range of 10 to 18 GHz, requiring near half wavelength height and periodicity. At these higher X and K u band frequencies, installation into buildings would not be an issue; however, at 2.4 GHz the half wavelength is considerably larger (λ/2 = 62.5 mm) and could cause issue with integration into existing building materials, or into narrow corridors and wall cavities.…”

Section: Introductionmentioning

confidence: 99%

Slanted-comb frequency selective surface for use in reducing specular scatter for TM polarization

2014 Loughborough Antennas and Propagation Conference (LAPC)

Rigelsford

2014

Self Cite

This paper describes the analysis of a slanted-comb frequency selective surface (SC-FSS) suitable for reducing the specular scatter of an incoming wave. The surface is optimized for reducing specular scatter at oblique angles of incidence. Compared to the original comb reflection FSS (CR-FSS), effective reduction in specular scatter is possible despite a large decrease in effective height, ensuring surface installation is as low profile as possible for integration into building materials and infrastructure. Frequency plots show the effect of changing the slant angle between 9 and 18 GHz.

“…This letter presents a pin reflection frequency selective surface (PR‐FSS), which is capable of reducing unwanted propagation down corridors. It is developed from a similar comb‐based structure described in but aims to reduce the total material use and cost. This reduction in material is likely to result in an inferior performance, and the relationship between pin separation (reduction in material) and surface performance are presented in this letter, with an optimal solution provided.…”

Section: Introductionmentioning

confidence: 99%

Passive pin reflection frequency selective surface for interference reduction in the built environment

Micro & Optical Tech Letters

Rigelsford

2014

The measured and simulated return loss results of proposed antenna are shown in Figure 6. Good agreement is achieved between the simulated and measured results. The measured bandwidths are 257 MHz (from 761 to 1018 MHz) and 681 MHz (from 2201 to 2882 MHz) for the UHF and microwave RFID application.It is desired to propose a method in controlling the secondary frequency with minimum effect on the primary resonant frequency. The parameter that can be used to control the secondary resonant frequency is L-probe arm length of y 2 . By adjusting the length of y 2 , the upper frequency of f 2 can be tuned. Figure 7 shows the return loss of the proposed antenna with different length of L-probe. It is found that the first resonant frequency can be easily controlled by selecting the radius of lower band circular patch. Table 2 shows the simulated results of primary frequency, secondary frequency, and their bandwidths by adjusting the arm length of L-probe. It is found that the increasing y 2 results in a significant increase of second resonant frequency bandwidth. CONCLUSIONIn this article, a new wideband L-probe circular dual-patch antenna on an electrically thick substrate has been presented for the dual-frequency RFID application. The proposed antenna achieves wide impedance bandwidth of 28.89 and 26.8% for the lower and upper bands, respectively. The maximum gains are 7.248 dBi in the lower band and 7.914 dBi in upper band. The effects of slot-loading on the circular patches are extensively studied. Finally, it is found that the proposed antenna has exhibited the properties of high gain, broad bandwidth, and good radiation characteristics for dual-frequency RFID operation. ABSTRACT: Proposed is a passive periodic pin reflection frequency selective surface (PR-FSS) suitable for installation in indoor environments to reduce interference caused by multiple cochannel wireless transmitters. The PR-FSS is developed from a comb reflection FSS and provides comparable performance with the use of less material.