Band Gap Characteristics of Planar Stretch-Dominated Thermal Expansion Lattice Metamaterial

Vibration characteristics of metamaterial beams manufactured of assemblies of periodic cells with built-in local resonances are presented. Each cell consists of a base structure provided with cavities filled by a viscoelastic membrane that supports a small mass to form a source of local resonance. This class of metamaterial structures exhibits unique band gap behavior extending to very low-frequency ranges. A finite element model (FEM) is developed to predict the modal, frequency response, and band gap characteristics of different configurations of the metamaterial beams. The model is exercised to demonstrate the band gap and mechanical filtering capabilities of this class of metamaterial beams. The predictions of the FEM are validated experimentally when the beams are subjected to excitations ranging between 10 and 5000 Hz. It is observed that there is excellent agreement between the theoretical predictions and the experimental results for plain beams, beams with cavities, and beams with cavities provided with local resonant sources. The obtained results emphasize the potential of the metamaterial beams for providing significant vibration attenuation and exhibiting band gaps extending to low frequencies. Such characteristics indicate that metamaterial beams are more effective in attenuating and filtering low-frequency structural vibrations than plain periodic beams of similar size and weight.

Download Full-text

Band gap characteristics of compound structure composed of lattices with different periodic constants

Acta Physica Sinica ◽

10.7498/aps.55.2785 ◽

2006 ◽

Vol 55 (6) ◽

pp. 2785

Author(s):

Zeng Jun ◽

Pan Jie-Yong ◽

Dong Jian-Wen ◽

Wang He-Zhou

Keyword(s):

Band Gap ◽

Compound Structure ◽

Gap Characteristics

Download Full-text

Development of Electromagnetic Band Gap Structures in the Perspective of Microstrip Antenna Design

International Journal of Antennas and Propagation ◽

10.1155/2013/507158 ◽

2013 ◽

Vol 2013 ◽

pp. 1-22 ◽

Cited By ~ 22

Author(s):

Md. Shahidul Alam ◽

Norbahiah Misran ◽

Baharudin Yatim ◽

Mohammad Tariqul Islam

Keyword(s):

Band Gap ◽

Antenna Arrays ◽

Communication Systems ◽

Performance Enhancement ◽

Microstrip Antennas ◽

Microwave Devices ◽

Electromagnetic Band Gap ◽

Wide Range ◽

High Efficient ◽

Gap Characteristics

Electromagnetic band gap (EBG) technology has become a significant breakthrough in the radio frequency (RF) and microwave applications due to their unique band gap characteristics at certain frequency ranges. Since 1999, the EBG structures have been investigated for improving performances of numerous RF and microwave devices utilizing the surface wave suppression and the artificial magnetic conductor (AMC) properties of these special type metamaterial. Issues such as compactness, wide bandwidth with low attenuation level, tunability, and suitability with planar circuitry all play an important role in the design of EBG structures. Remarkable efforts have been undertaken for the development of EBG structures to be compatible with a wide range of wireless communication systems. This paper provides a comprehensive review on various EBG structures such as three-, two-, and one-dimensional (3D, 2D, and 1D) EBG, mushroom and uniplanar EBG, and their successive advancement. Considering the related fabrication complexities, implementation of vialess EBG is an attractive topic for microwave engineers. For microstrip antennas, EBG structures are used in diversified ways, which of course found to be effective except in some cases. The EBG structures are also successfully utilized in antenna arrays for reducing the mutual coupling between elements of the array. Current challenges and limitations of the typical microstrip antennas and different EBG structures are discussed in details with some possible suggestions. Hopefully, this survey will guide to increasing efforts towards the development of more compact, wideband, and high-efficient uniplanar EBG structures for performance enhancement of antenna and other microwave devices.

Download Full-text